Cooling Blog

Updates and news about Puravents range of air conditioners, chillers, air handling units and evaporative cooling systems.

HVLS fan or high volume low speed fan. Either way this is the machine to use in order to lower apparent temperature

HVLS Fans For Cooling in Buildings

Introduction to HVLS Fans and apparent temperature

The remarkable thing was that when I visited the  factory making HVLS fans in Italy it was a warm day. Leaving the factory building and walking to the car, the sun was relentlessly beating down and opening the door of the little hire car was like opening a preheated oven. It was only 20 minutes into the journey with the air conditioning running at full blast that the car came down to a comfortable temperature and the internal surfaces settled to somewhere below melting point.

But here’s the thing. All day inside the factory it had been cool and refreshing. Hot outside, yet cool inside.

As I drove back to the airport I reflected that with near 3 decades in the air business having sold and supplied 1000s of fans, I had never given thought to, nor even heard of, the concept of apparent temperature. It had been a good day – learning more about HVLS fans and discovering the nuts and bolts about apparent temperature.

What are HVLS Fans ?

HVLS fans  are so called for thier High Volume and Low Speed

HVLS fan or high volume low speed fan. Either way HVLS fans are the machines to use in order to lower apparent temperature in large buildings

HVLS fans are characterised by two elements – firstly High Volume, the HV bit. The Evel range of HVLS fans runs from the smallest with 1.4mØ blades moving 41,000m3/hr of air through 15 models to the largest with 7m Ø blades moving 850,000m3/hr. By any reckoning that is a huge airflow.

The second element is Low Speed, the LS bit. It refers to both the speed of the fan blades and to the air discharge velocity. As an example the largest in the range that moves the whopping 850,000 m3/hr rotates at a sloth like 50 rpm. In other words at full speed it takes over a second to complete a revolution. To someone like me used to fans on a direct drive doing 960 rpm or more it took a moment or two to understand just how slowly they move. Their slowness is however a good thing. Because of the lazy sweep of these vast blades the air speed that they create is slow so instead of a busy little throw of air from a normal fan that blows your socks off, the vast air flow from these HVLS fans gently washes over you.

It is difficult to adequately describe the effect. The area affected by the airflow from one HVLS fan is very large, and wherever you walk in this area you are aware of refreshing air movement, yet in no way are you ruffled by it. This constant gentle air movement is refreshing and it does make you feel cool and comfortable.

What is Apparent Temperature?

On a still hot day the mercury can be say 35°C and it will feel hot and uncomfortable, particularly if it is humid. If however there is a gentle breeze the mercury will still be 35°C but it will feel cooler. Evaporation of moisture from our skin cools our skin so that we feel cooler and indeed when it is on a continuous basis, we are kept cooler. In other words, when there is air movement our body’s’ natural cooling mechanism is more effective.

The relationship is straight forward so that apparent temperature changes as follows;

•   Increases with increasing humidity and visa versa

•   Decreases with air speed and visa versa

So apparent temperature and perceived temperature are one and the same thing and they differ from dry bulb temperature dependant on air speed and humidity.

Knowing that it is a hot day outside yet being inside a big building where you feel quite comfortable is a slightly weird experience – not cool exactly but not too warm either, and where there is a constant sensation of air movement throughout the building. It makes for a very pleasant working environment.

With no HVLS fans there is no air movement and the room condition is uncomfortable

When there is no air movement the set point of 27°C and 50%RH falls outside the comfort zone

With HVLS fans producing a net air velocity of 1m/s the room air is comfortable

When there is 1m/s air movement the set point of 27°C and 50%RH falls easily into the comfort zone.

 

What makes Evel HVLS fans a bit special?

Essentially there are only 4 main bits on a HVLS fan, the motor, the mounting, the blades and the controls.

Evel HVLS Fan Motors. Changes to European regulations on energy efficiency in recent years has resulted in many machines now being driven by EC (electronically commutated) motors. These brushless motors are without doubt more efficient and more readily controlled than old AC induction motors. The motors on the Evel HVLS fans are all brushless EC type but the clever bit is that they are direct drive. No belts, no gearbox – just a shaft direct from the motor to the fan hub assembly.

big motorWhen you have been used to 4 pole induction motors that whizz about 1450 rpm under load, it takes a bit of head scratching to realise that the motor of the biggest fan in the range can is spinning at the same speed as the fan blades i.e. 50 rpm But it is even more daunting that this is its maximum speed, and in fact taking a 0-10v control signal, it can be controlled to spin at much slower speed if required. The start-up on these motors is sublime and not unlike a Rolls Royce gently pulling away to hit walking pace. Loads of torque at minute speed.

The motors only come in a couple of sizes basically the larger fans get the bigger one and the smaller fans get the smaller motor. But the clever bit is that each motor is programmed to a operate to suit the fan size and blade profile that is being fitted to it. Each fan model has a lengthy set of parameters that must be programmed into the motor so that it runs and the very best efficiency. Each complete fan can be connected via a controller to the internet. This is useful for periodic checking and also in the remote event that the HVLS fans brushless motor goes wrong because it can be interrogated remotely and its operating parameters can be compared to design values and even temperature of the casing and shaft can be seen.

Evel HVLS Fan Mounting. There a number of bits to the mounting arrangement and none of them is exactly lightweight.

Evel HVLS fans are mounted with a fail safe support cradle

The support structure is a thorough fail safe design.

The motor is cradled by a pair of inverted U-shaped brackets and these support a base plate to which the base of the motor is bolted. The impeller hub is bolted to end of the shaft with a number of bolts. These are designed to be tightened to different torques so that the weight is supported by the two tightest bolts but should they both fail other bolts will take the weight. A further layer of fail safe design is in the form of a pair or brackets bolted to the base of the motor which cradle but do not touch the rotating shaft. If the hub becomes part detached because all 3 bolts have failed these cradle plates will support the blades and prevent them detaching fully.

The hub comprises of a ‘spider’ assembly which comprises of 2 plates each of which has 5 spurs. These twin spider plates are so designed such that if one spur cracks then the other is perfectly touch enough to support the blade on its own.

Mounting of the complete fan assembly is facilitated by a number of optional fittings which are selected depending on the design of the roof structure.

aerofoil tip

Engineered aerofoil profile with moulded wing tip to ensure the air does not spill from the end of the blades

HVLS Fan Blades. It is interesting to note that HVLS fans come with a variety of blade quantities. Early ones had 10 blades, others have 8 or 6 blades. The Evel range of HVLS fans has 5 blades. The choice of the number of blades is the subject of much research. For a given fan speed, too many blades and you find that any one of the blades is trying to bit into turbulent air from the preceding blade. Too few blades and the fan will not move as much air as it could if it had another blade. In other words like so many things in engineering the game is to work out what the top of the bell curve for the parameter you are designing. The engineered balance between turbulence and maximum effectiveness for the speed that these aerofoil blade revolve results in a design that uses 5 blades, each with a upturned wing tip designed to stop air escaping the sweeping movement of the aerofoil profile of the blade.

Control. There are a number of control options to the Evel HVLS fans. All work from a 0-10v speed control signal but there are various options for added control sophistication and system monitoring via modbus.

What About The Racket?

It is a fair question. Moving say 850,000m3/hr of air is bound to be massively noisy. At least that is what I thought before visiting the factory in Italy. Well used to the sound of blades beating air into submission and of whirring motors and humming gears, I fully expected something to fill my ears.

I admit that after a former life in uniform  with the occasional loud bang, hearing pins drop is not exactly my forte. I listened, I felt the refreshing wash of air movement, and I think I detected a faint hum. My host said that noise was not the fan but was coming from the factory next door. Not convinced, I ambled across the factory floor towards the back wall adjacent to the next door property and right enough the hum increased in volume – it was the factory next door. Of the gently sweeping HVLS fan above my head I heard diddly squat.

With the lack of noise, the slowly rotating motor and blades and the gentle even breeze they created, the effect on the senses was sublime.

Make your environment comfortable and take your air space to the next level with Evel HVLS fans from Puravent.

Call us for more information or help.

HVLS fans in a fitness studio. A breeze in an environment like this - Bliss

HVLS fans in a fitness studio. A constant breeze in an environment like this – Complete bliss !

 

Heat Stress in Poultry- a financial disaster that can be avoided

Heat Stress in Poultry – What can you do?

Heat stress in poultry – What can you do?

Eleven of Plant Earth’s hottest years ever recorded have been in the last 20 years. This year the highest UK temperature ever was recorded at Cambridge – 38.7°C and the trend indicates records will be broken again and again in coming years.

Estimates vary, however it is widely assumed that each adult bird produces 10 – 20 watts of heat. On a hot day the roof of a poultry house can rise to 60°C due to the combined effects of the sun on the outside and rising heat from the poultry on the inside. If the body heat of a bird rises from 41°C (normal) to 45°C the bird will die.

Heat stress in poultry (and all other livestock production) is set to become a more frequent and an even more severe problem than it is today. Although it is a serious stock welfare and financial issue to livestock producers, it is also an issue with effects that can be minimized with preventative measures.

Where does the heat stress come from?

Apart from external heat sources the poultry produce a good deal of heat themselves as a result of metabolism – body maintenance, growth and egg production all produce heat which under normal weather conditions the heat is lost through :-

  • Radiation – heat is lost from the body of the bird by radiation provided the surrounding surfaces are at a lower temperature than the bird. Conversely hot roofs and walls will radiate heat towards the birds.
  • Convection – heat radiated from the bird will naturally rise towards he ceiling of the shed – where an outlet for the heat must be provided. Ventilation will assist this provided the airflow is high enough to break down the boundary layer of still air around the bird’s body.
  • Conduction – If the bird is in physical contact with a surface at a lower temperature than it’s body, heat will transfer to the cooler object.
  • External sources – Heat and humidity caused by the ambient weather conditions outside the poultry shed.

As well as sources of heat it is important to remember that heat stress results from a combination of temperature and humidity. The heat stress charts always pitch temperature on one scale against humidity on the other. For a given ambient temperature, the level of discomfort to the birds will be greater on high humidity days than if the humidity was lower.

What are the signs of heat stress in poultry?

  • Birds will pant at up to 230 times a minute in order to drive off heat in the form of water vapour – hence the need for plenty of cool drinking water for re-hydration. If the conditions are highly humid the panting of the bird is ineffective resulting in a very rapid increase in stress levels.

    Interior of a typical poultry shed

    Interior of a typical poultry shed

  • Raised wings in order to expose the featherless underwing area from which body heat (carried to the skin surface by blood vessels) may radiate.
  • Pale combs/wattles.
  • Lethargy.

In worst case:-

  • Diahorea.
  • Seizures/convulsions.

Other consequences of heat stress in poultry.

Unless measures are taken producers will see:-

  • Reduced growth rates in younger birds unable to react to rapid changes in temperature and humidity.

    Poultry discomfort chart by tempeture and humidity

    Poultry discomfort chart by temperature and humidity

  • Reduced egg production in more mature birds.
  • Darkening of the skin colour as more blood is diverted to the surface to combat the body heat rise.
  • Increased mortality in all birds but especially in the younger birds.

Measures to reduce heat stress in poultry

  • Make sure birds have cool, clean water.
  • Add electrolytes to water. Electrolytes help to balance the birds’ own electrolytes, plus they will drink more water.
  • Provide protection against direct sunshine and ensure the poultry house’s exterior structure is insulated and heat reflecting rather than heat absorbing
  • Reduce overcrowding and other forms of stress such as the presence of children, dogs, noise etc.
  • Provide adequate ventilation to remove the rising heat created by the flock.

Importance of good ventilation

Natural ventilation is not adequate in extreme circumstances. When high temperature is combined with high humidity all animals will naturally work to regulate their own body temperatures by measures such as sweating, panting, moving apart, reduction of food intake and activity etc.

It is important under extreme conditions to turn over the whole air volume of the shed regularly and also recirculate air within the shed when internal air distribution is poor.

Remebering that heat stress in poultry is in part a factor of humidity, it is important to realise that humidity levels will be higher inside the  poultry shed than outside. This is because of the littering of the stock and their sweating. Each bird delivers both heat and moisture load to the inside air. Although you can not change the humidity outside of the shed, with sufficient ventilation you can ensure that the effect of humidity on the heat stress level is no more than the outside ambient level.

Maximum_Ventialtion_rates_(m3_h_per_1000_birds) essential to prevention of heat stress in poultry

Maximum ventilation rates (m3/h per 1000 birds) – source DEFRA. The through flow of air based on these rates is essential to prevent heat stress in poultry

Main ventilation fans can be placed either:-

  • In a side wall preferably a North-Facing wall to push fresh air into the building – hot air would in this case exit the building through louvered  vents in the Apex or opposite end of the building.
  • In the Apex of the building to draw hot air out – fresh air would then enter through louvres in the walls (preferably North-Facing).
Box inlet fans - poultry house. An essential part of the shed infrastructrure to prevent heat stress in poultry

Internal view of Louvered Main Ventilation Fans

Suspended fan - part of the solution for heat stress in poultry

Suspended fan – poultry house

Puravent’s main recirculation ventilation fans are available in 3-blade or 5-blade versions, with or without inlet cones and in a wide variety of diameters (915mm to 140mm). We also offer panel fans range in diameter from 200mm to 920mm and in power from 60W to 1.8kW. They are also available in single phase (230v) or 3-phase (440v). All have IE2 or IE3 energy efficient motors.

Multifan with bird guard

Main ventilation fans – Optional cone for greater air flow

Puravent’s Internal recirculation fans should be placed  strategically around the shed so that fresh air does not short-circuit directly to the hot air outlets leaving discreet areas such as corners of rooms with no air turnover. These panel fans range in diameter from 200mm to 920mm ad in power from 60W to 1.8kW. They are also available in single phase (230v) or 3-phase (440v). This range covers air flows from 650m3/h through to 25,500m3/h.

V_flow_fans create disruption to linear flows down the poultry house

Typical V-Flo fan

V-flo fans can take air from above and below and throw it out to the sides of the shed. They are a great tool for the prevention of heat stress in poultry

V-Flo fan air flow patern

V-Flo fans in poultry application

As well as moving air through poultry buildings the air needs to be disrupted as it transits the building so that air movement reaches all of the corners and edges of the building.

Another method of minimising short-circuiting from inlet-fan to building-exhaust (thereby ensuring all the birds receive the benefit of the ventilation), is to create turbulence by the introduction of V- Flow fans. These ensure that air passing down the poultry house is driven out to the sides of the building as well as passing down the length of it.

Prevention of heat stress in poultry, is something that we know about and can help with. To view the full range of fans visit our website www.puravent.co.uk or call us on 01729 824108 to discuss your specific requirements.

 

How to stay cool without air conditioning

Cooling Options.

With the weather hotting up we discuss how evaporative coolers work and investigate which of the products on the market are suited to various applications. Traditional split type Air Conditioning machines recycle cooled air within a sealed or semi-sealed environment as allowing cooled air to escape would drastically reduce the efficiency of the process. The heat is transferred to a recirculating liquid which then passes through a heat exchanger outside the building and is dispersed externally.

On the other hand Evaporative Coolers are particularly suited to environments which for one reason or another cannot be sealed or where there is a preference for ‘Fresh’ air rather than recycled air.

How it Works

Mobile Evaporative Cooler

Simplified Evaporative Cooler Diagram.

Mobile Evaporative Cooler

Exhaust exits MUST be provided for both fixed and mobile systems.

The simplified diagrams show how the process works. Fresh air is drawn in from outside the building and passed through a recirculating ‘curtain’ of water (the wet filter). A proportion of the cascading water evaporates into the air stream providing cooling in the same way as sweating cools humans and animals.

The remaining cascading water absorbs an exactly equivalent amount of heat from the air. As a result the properties of the air stream are converted from warm/dry to cool/moist.

Exhaust exits MUST be provided on both fixed and mobile Evaporative Cooling Systems in order to prevent the build up of moisture within the building.

Fixed Evaporative Coolers

Fixed Evaporative Coolers would be permanently plumbed to the water supply and might be situated as per the illustrations below. These show a small number of a wide variety of possible configurations. Internally the cooled air is then ducted to the areas required. These systems draw fresh air from OUTSIDE the building and exhaust humid air from ventilation points around the building.

Met_Mann_4

Top discharge floor mount.

Mobile Evaporative Cooler

Ceiling mounted bottom discharge.

Mobile Evaporative Cooler

Bottom discharge wall mount.

Mobile Evaporative Cooler

Top discharge floor mount.

Mobile Evaporative Cooler

Internal ducting.

 

Smaller Mobile Evaporative Cooler

CCX4.0
CCX4.0 Mobile Evaporative Cooler for large home / small commercial applications.
Mobile Evaporative Cooler

DuraCool Plus with 30 litre tank for domestic applications.

A Mobile Evaporative Cooler draws fresh air from INSIDE the building but humid air must still be exhausted from the building via ventilation points such as windows or open doors. A Mobile Evaporative Cooler will generally have a water tank incorporated rather than being plumbed in to a water supply.

Depending on the design it may be possible to attach a temporarily water supply via a level control system or more usually manual top up of the water tank is required. The DuraCool Mobile Evaporative Cooler has a 30 litre tank and will effectively serve an area of up to 50m2.

The CCX4.0 Mobile Evaporative Cooler for example has a 50 litre water tank incorporated into its base  and would be manually topped up with water (hose pipe or the like). This will effectively serve an area of up to 80m2.

Mobile Evaporative Cooler

Met Mann range up to 15,000m3/hour.

Mid-Range Mobile Evaporative Cooler

Met Mann’s mid-size range of Mobile Evaporative Cooler are manufactured in Spain and are cleverly designed with features to make operation and maintenance easy. Made with the same tough components and superior build quality that are found in fixed units. These Mobile Evaporative Coolers carry a 10 year guarantee for the polyamide top and base, whilst the other components are guaranteed for 2 years.

These Mobile Evaporative Coolers are designed to be a tough long-term asset. Equipped with automatic water tank level control the range offers throughput of 4,200 m3/h through to 15,000 m3/h in 5 sizes most of which are available in either fixed speed of inverter drive options. Weights range from 120kg through to 220kg at the top of the range. All units are supplied with a 25m hose so that the onboard water tank may be connected to the nearest tap/hosetail. Available in 1-Phase and 3-Phase alternatives they are ideal for Large Commercial and Small Industrial applications.

Larger Mobile Evaporative Cooler

Mobile Evaporative Cooler

Master’s BC340 – 30,000 m3/hour airflow.

 

Mobile Evaporative Cooler

Master’s BC180 – 18,000 m3/hour airflow.

Moving up again in size we near the practical limit for a Mobile Evaporative Cooler. Master’s range includes the BC180 and BC340. The Master BC340 Mobile Evaporative Cooler covers an area of 400m2 and also has automatic water tank level control. At peak output the Master BC340 consumes 15-20 litres of water depending on the ambient temperature and relative humidity of the incoming air.

Having a tank volume of 200 litres it will need topping up only once per 10 hours of continuous peak output. Even so it consumes only 1.1kW of power and so will operate off a single phase, 13 Amp plug. Ideal applications include Workshops, Warehouses and Manufacturing units as well as Greenhouses and Cowsheds.

Help and advice

If you would like to find out more or to get advice on reaching an ideal air circulation system for your application then email us at puravent@gmail.com or call us on +44 (0)1729 824108

Mobile Evaporative Cooler Options

Mobile Evaporative Cooler Options.

In this article we discuss how evaporative coolers work and investigate which of the products on the market are suited to various applications. Traditional split type Air Conditioning machines recycle cooled air within a sealed or semi-sealed environment as allowing cooled air to escape would drastically reduce the efficiency of the process. The heat is transferred to a recirculating liquid which then passes through a heat exchanger outside the building and is dispersed externally.

On the other hand Evaporative Coolers are particularly suited to environments which for one reason or another cannot be sealed or where there is a preference for ‘Fresh’ air rather than recycled air.

How it Works

Mobile Evaporative Cooler

Simplified Evaporative Cooler Diagram.

Mobile Evaporative Cooler

Exhaust exits MUST be provided for both fixed and mobile systems.

The simplified diagrams show how the process works. Fresh air is drawn in from outside the building and passed through a recirculating ‘curtain’ of water (the wet filter). A proportion of the cascading water evaporates into the air stream providing cooling in the same way as sweating cools humans and animals.

The remaining cascading water absorbs an exactly equivalent amount of heat from the air. As a result the properties of the air stream are converted from warm/dry to cool/moist.

Exhaust exits MUST be provided on both fixed and mobile Evaporative Cooling Systems in order to prevent the build up of moisture within the building.

Fixed Evaporative Coolers

Fixed Evaporative Coolers would be permanently plumbed to the water supply and might be situated as per the illustrations below. These show a small number of a wide variety of possible configurations. Internally the cooled air is then ducted to the areas required. These systems draw fresh air from OUTSIDE the building and exhaust humid air from ventilation points around the building.

Met_Mann_4

Top discharge floor mount.

Mobile Evaporative Cooler

Ceiling mounted bottom discharge.

Mobile Evaporative Cooler

Bottom discharge wall mount.

Mobile Evaporative Cooler

Top discharge floor mount.

Mobile Evaporative Cooler

Internal ducting.

 

Smaller Mobile Evaporative Cooler

CCX4.0
CCX4.0 Mobile Evaporative Cooler for large home / small commercial applications.
Mobile Evaporative Cooler

DuraCool Plus with 30 litre tank for domestic applications.

A Mobile Evaporative Cooler draws fresh air from INSIDE the building but humid air must still be exhausted from the building via ventilation points such as windows or open doors. A Mobile Evaporative Cooler will generally have a water tank incorporated rather than being plumbed in to a water supply.

Depending on the design it may be possible to attach a temporarily water supply via a level control system or more usually manual top up of the water tank is required. The DuraCool Mobile Evaporative Cooler has a 30 litre tank and will effectively serve an area of up to 50m2.

The CCX4.0 Mobile Evaporative Cooler for example has a 50 litre water tank incorporated into its base  and would be manually topped up with water (hose pipe or the like). This will effectively serve an area of up to 80m2.

Mobile Evaporative Cooler

Met Mann range up to 15,000m3/hour.

Mid-Range Mobile Evaporative Cooler

Met Mann’s mid-size range of Mobile Evaporative Cooler are manufactured in Spain and are cleverly designed with features to make operation and maintenance easy. Made with the same tough components and superior build quality that are found in fixed units. These Mobile Evaporative Coolers carry a 10 year guarantee for the polyamide top and base, whilst the other components are guaranteed for 2 years.

These Mobile Evaporative Coolers are designed to be a tough long-term asset. Equipped with automatic water tank level control the range offers throughput of 4,200 m3/h through to 15,000 m3/h in 5 sizes most of which are available in either fixed speed of inverter drive options. Weights range from 120kg through to 220kg at the top of the range. All units are supplied with a 25m hose so that the onboard water tank may be connected to the nearest tap/hosetail. Available in 1-Phase and 3-Phase alternatives they are ideal for Large Commercial and Small Industrial applications.

Larger Mobile Evaporative Cooler

Mobile Evaporative Cooler

Master’s BC340 – 30,000 m3/hour airflow.

 

Mobile Evaporative Cooler

Master’s BC180 – 18,000 m3/hour airflow.

Moving up again in size we near the practical limit for a Mobile Evaporative Cooler. Master’s range includes the BC180 and BC340. The Master BC340 Mobile Evaporative Cooler covers an area of 400m2 and also has automatic water tank level control. At peak output the Master BC340 consumes 15-20 litres of water depending on the ambient temperature and relative humidity of the incoming air.

Having a tank volume of 200 litres it will need topping up only once per 10 hours of continuous peak output. Even so it consumes only 1.1kW of power and so will operate off a single phase, 13 Amp plug. Ideal applications include Workshops, Warehouses and Manufacturing units as well as Greenhouses and Cowsheds.

Help and advice

If you would like to find out more or to get advice on reaching an ideal air circulation system for your application then email us at puravent@gmail.com or call us on +44 (0)1729 824108

Industrial Evaporative Coolers from Master

When it comes to sourcing industrial evaporative coolers, there is quite a lot of choice.  And there is now a little bit more choice.

The Metmann AD series of Industrial Evaporative Coolers

The Metmann AD series of Industrial Evaporative Coolers

In Europe the leading manufacturer of evaporative coolers is Metmann and we have been supplying Metmann industrial evaporative coolers including the AD range for a number of years. They have always provided a huge spread of ‘installed’ evaporative cooler capacities from about 5500m3/hr, right up to about 63000m3/hr. They share a common construction of top moulding and base moulding, with separate corner pillars held between top and base. This forms the outer construction. Inside this outer construction are the internal components of fan, pump and valves etc.  So much for the AD range of industrial evaporative coolers…

Master BCF 230AB 231AB industrial evaporative coolers

Master BCF range industrial evaporative coolers are constructed of UV resistant moulded plastic casings

But there is another way to supply evaporative cooling as the Master BCF industrial evaporative coolers demonstrate. With an all plastic moulded construction to contain the evaporative cooling pads and internals, it looks very different to the Metmann AD range. The theory is that if, say, you need say 78000m3/hr of cool supply air then divide it by the maximum flow from a BFC unit, 18000m3/hr and round up the number. In this simple example you would need five Master BCF industrial evaporative coolers to achieve the requirement.

One Size Fits All Industrial Evaporative Coolers

The inevitable conclusion is that the Master BCF range is not so much a range of evaporative coolers but a building block in a ‘one size fits all’ approach to evaporative cooling. This is all very well, but it only works if the ‘building blocks’, the BCF, is a particularly cost-effective unit (which it is), and if the application can stand numerous little evaporative coolers instead of perhaps fewer large ones.

AssumMaster BCF industrial evaporative cooler featuresing that costs are OK and that the Master BCF is right for the application, then what of the evaporative cooler itself?  With a moulded plastic casing, it looks identical to all the other models of this type by other manufacturers, which is no bad thing – it at least follows a proven concept. On each of the 4 sides there is a removable inlet screen with the Celdec evaporative cooler pad behind. The removal of a side or two provides good access to the internals, where the heart of the matter is the fan.

Traditionally the standard axial fan on this variety of industrial evaporative cooler was the weak link that limited their application to the shortest possible duct and diffuser arrangements. However the Master BCF range of industrial evaporative coolers includes versions that have a radial fan instead of an axial fan. The radial fan versions have 300 Pa of pressure capability at their performance point, which represents an additional 100Pa over the axial version. This extra 100Pa of pressure means that the radial version can push air along an extra 54m of straight duct making them a bit more useful for getting the cooled air to where it is needed inside the building.

Industrial Evaporative Coolers Any Which Way

Although the radial fan version of the cooler is available only as a base discharge unit, the axial versions are available as a base discharge, top discharge and a side discharge. As always with this type of evaporative cooler the side discharge unit actually sacrifices some cooling performance by using one of the 4 available sides for the fan. For this reason top or base discharge evaporative coolers are always preferable to side discharge machines.

Master BCF 230AB 231AB evaporative cooler dischargeMaster BCF 230AU 231AU evaporative cooler dischargeMaster BCF 230AL 231AL evaporative cooler discharge

 

 

 

 

 

Master BCF 230RB 231RB evaporative cooler installation Master BCF 230RB 231RB evaporative cooler installatoin

 Typical base discharge installations

Master BCF 230AU 231AU evaporative cooler installation Master BCF 230AU 231AU evaporative cooler installation 1
 Typical top discharge installations

 

Control For One And Control For All

But a useful feature on the Master BCF range is that the machines come with a couple of control variants.

The BCF 230 industrial evaporative coolers come complete with dedicated remote controllers. Each BCF 230 comes with a remote wall mountable LCD control and lead as well as an infrared remote control. For simple applications with a small quantity of coolers the BCF 230 is the most economical solution. It enables the user a neat remote control unit, from which you can preset temperature and humidity thresholds and fan speed then let the evaporative cooler do the rest.

If however the application requires several coolers and, or perhaps you need to be able to control them through a single control linked with an internet interface for control via a computer or smart phone, then the BCF 231 is the machine to get. The BCF 231 is more expensive but it enables up to 31 evaporative coolers to be connected to a single controller, the SM 4.0. Using the controller each of the connected evaporative coolers can be individually controlled and preset.

 

 

 

 

More Evaporative Cooler Information

•       If you need cooler air in your factory, then we can provide all the evaporative coolers, ancilleries the help that you need.

Call us on 01729 824108 or email using our enquiry form here

•       For more reading into the subject there we have lots of further information and guides on industrial evaporative coolers and evaporative cooling here

•       For a video about evaporative cooling ….

 

 

Choosing evaporative Cooling – choose with care

Choosing Evaporative Cooling

We had an enquiry the other day. “We need evaporative coolers”, they said,  “about 3 of them”. Our enquirer, it seemed, had made his choice. Now choosing evaporative cooling was mearly a matter of picking a size and colour, or so it seemed.

From a promising start it soon became apparent that this was not a suitable application for evaporative coolers. The building was a reasonable size and was in fact a venue, used for weddings and the like. With a relatively low ceiling and stuffed with people in fancy hats eating wedding cake, there is going to be a requirement for considerable cooling on a warm day. The trouble is that for this application the volume of air that would be required to cool the room and its occupants would be very high relative to its ceiling height. The air movement that would result from introducing the cool airflow would be more than a nuisance – the serviettes would be flying all over the place, and… there goes the best mans speech!

In a different environment and with higher ceilings the story would be quite different. For industrial applications with lower occupation levels and where staff are working and would welcome any breeze but particularly a cool one, the cool air movement introduced by evaporative coolers is a bonus not a nuisance.

Going back to this application, we could put in fewer evaporative coolers and duct the air to more diffusers to avoid drafts. The problem here is that the quantity of cooling delivered on this draft free air would not be sufficient for fulfil the main objective – cooling. Moreover, such an installation would only serve  to give evaporative coolers a bad name. Wedding guests would be perhaps more inclined to spread bad news about the venue and its cooling rather than good news.

A better solution – how about chiller modules and some fan coils? Heating and cooling capability from one system and no ruffled hat feathers.

Choosing Evaporative Cooling

When choosing evaporative cooler bare in mind there are other ways to provide cooling

Being specialist suppliers of several different cooling technologies, allows us to approach enquiries without a technological bias. Here was a case in point.

Case study in simple office cooling

Hot Office Problem
It’s not uncommon to have a south-facing window, and as much as we like the view from our office, there is a problem. In summer as the morning progresses we can feel the heat gain through our south-facing window as the sun reaches its zenith. For the rest of the day the office remains hot and can become stifling. Work rate decreases. Mistakes increase 😡

Office Cooling Solution Step 1
Rather than get an air conditioner to rattle away in the corner, we decided to lower the window blind before mid morning on the big window in the office and to use natural ventilation. So we opened the windows. Both windows are on the south side so whilst it was an improvement the air movement through the windows was limited 😐

Office Cooling Solution Step 2
The office has its access door from outside on the east side of the building. So we opened it and held it open with a bungee. Soon we had doors and windows banging shut as air rushed in or out of the office. Whilst the canister of bungees was out, it seemed like a good idea to use some more bits of hooked elastic to hold the internal doors and the toilet window open. Great. No more banging windows or doors and reasonable air flow though the office. With only a slight breeze outside we get outside air (which is always cooler than inside air,) flowing through the office 🙂

But There Is Still A Problem
The recent hot weather has been from a ‘blocking high’. It’s because the jet stream is well above the UK that there is a large area of high pressure sitting over the British Isles. Not only does this high pressure give us clear blue skies and hot weather, it also means that there is precious little wind or even a light breeze. It means that our office does not have enough air moving through even with doors and windows open 🙁

Office Cooling Solution Step 3
Seeing that a small part of our business is the supply of wall mounted fans it seemed like a good idea to use one of these fans in the office. It was the clever placement that made it really work. The office is long and narrow and the fan was mounted at one end near the door. With the oscillation function switched off it was left set at an angle which helps to pull air though the doorway from outside and blow the air through the length of the office. Bliss – fresh relatively cool air flowing through the office even when there is no breeze outside 🙂

And here is a plan view of our office complete with ‘cheap as chips’ office cooling…

office cooling with natual ventilation and a wall mounted oscillating fan

Effective office cooling with natural ventilation and a wall mounted oscillating fan….Genius!

You to could probably work wonders cooling your work place with a wall mounted fan. Heres the line up that we offer…

The Cyclone 45T-W 18"Ø wall mounted oscillating fan

The Cyclone 45T-W 18″Ø wall mounted oscillating fan

The Cyclone 50W oscillating wall mounted fan

The Cyclone 50W 20″ Ø oscillating wall mounted fan

The Cyclone 650T-W 26"Ø oscillating wall mounted fan

The Cyclone 650T-W 26″Ø oscillating wall mounted fan

The Cyclone 750W 30"Ø oscillating wall mounted fan

The Cyclone 750W 30″Ø oscillating wall mounted fan

 

Cooling a Room: Top 10 Tips for Creating the Optimum Environment

Some simple steps for cooling a room. Here are short pointers to guide you on efficiently to cooling a room and using the right equipment for your application.

  1.      Cross ventilation can go a long way. Let air into a room through an “inlet” window or doorway, open internal doors and finally let the air escape out via “outlet” window and doors.   Logically placed windows, doors, and fans significantly aid in regulating airflow through a room. Also placing a fan in front of an inlet window or a fan facing outward of an outlet window is a great way to help move cooler outside air through your room. A concept which naturally seems counter-intuitive compared to a fan placed in busy zones, can actually prove to be more effective.building ventilation
  2.    Opening windows at night creates a cooler house during the day. Depending on your climate zone, temperatures significantly drop at night-time which creates a natural opportunity of which to take advantage.
  3.    Curtains and blinds. Blocking heat rays through shutters or curtains is an often overlooked. It can help to keep the sun and heat out of the room and the cool air in.
  4.    If you are using air conditioning close off rooms you’re not using. The less air to cool the better. But if you are not using air conditioning then actually you might need to open internal doors to allow the passage of air through open windows on different sides of the building.
  5.    Destratification fans are a low-cost and money-saving alternative. Thermal stratification is perhaps the single biggest waste of energy in buildings today in the heating season. And in the cooling season destratification fans can help by mixing and moving internal air in a building. Using a destratification fan in conjunction with open windows aids in regulating an optimum airflow throughout the room.
  6.    Find the right size air conditioning unit for your application. Bigger is not always better! You run the risk of damaging your unit through ‘short-cycling’  and on the other hand a unit too small for the application will run the risk of loosing effectiveness because it is working so hard that the condensate on the cooling coil freezes preventing the passage of air through the coil.
  7.    Keep the AC thermostat at a reasonable set temperature between 19° to 22°C which will not only help conserve energy, but will work to cool a room a lot more efficiently than at a lower temperature.
  8.    Keep your unit up to scratch. Checking filters and coils can ensure your unit is working to its optimum output.
  9.    Remember to turn the unit off when the ambient temperature becomes more bearable. Running it constantly not only costs more in terms of energy but will also shorten the life of the unit.
  10.    Keep the thermostat away from appliances such as TVs or computers as it will pick up their heat radiation and keep the unit running longer than necessary.

Range of systems appropriate for cooling a room

cooling a room

Window Air Conditioners

cooling a room

Wall Mounted Air Conditioners

cooling a room

Mobile Air Conditioner

Pros:

  • Generally the cheaper option.

Cons:

  • More noisy than a split air conditioner
  • Cannot be used in very thick walls

 

 

 

 

Pros:

  • Again, generally a cheaper option with a similar price
  • A self-contained unit that is easy to install and indeed replace

Cons:

  • Usually fairly limited in cooling capacity

 

 

 

Pros:

  • Very portable. Can wheeled around
  • No installation hassle

Cons:

  • Bulky, and can be in the way in very small applications
  • Can be quite noisy
  • Sometimes need condensate reservoir to be manually emptied

 

cooling a room

Destratification fans

45W industrial wall mounted fan

Wall mounted oscillating fans

cooling a room

Open windows and doors

Pros:

  • Energy saving in the heating season
  • Helps to move air about in a room in cooling season
  • Can help to move fresh air into a room

Cons:

  • Does not produce cold air

 

 

Pros:

  • Fresh air is always nice
  • Cross ventilation is a free and surprisingly effective

Cons:

  • Dependant on airflow and temperature outside
  • Does not produce cold air
  • Potential security and safety issues

 

If you have any further questions about cooling a room, feel free to contact our UK office for further information on 0845 6880112 or visit us on our website.

Unico Wall Mounted Air Conditioner

Attractive clean design sets Unico models apart

There have been various attempts over the years to provide the market with an installed monoblock wall mounted air conditioner range which not only looks good but also performs quietly, effectively and efficiently. Over the last few years a number of brands have appeared with promise but then fade from the market. During this period the Unico wall mounted air conditioners have always been there and they have steadily improved over the years.

The need for wall mounted air conditioner ranges came into sharp focus as the old style ‘window’ air conditioners which were the standard easy install cooling fix for small applications fell foul of European efficiency regulations. It was never an ideal replacement as the wall mounted air conditioner was usually more expensive and less powerful than the window air conditioners. But as the old style machines faded from the market the Unico wall mounted air conditioner range got better and became more cost-effective.

There are now 14 different models in the range with outputs from 1.8kw (6143 BTU) to 3.1kw (10580 BTU). Some have inverters which provide for greater efficiency and variety of running speeds, some have heat pumps to provide cost-effective heating in cooler months. What they all share is A rated energy efficiency rating and great aesthetic design.

Unico Wall Mounted Air Conditioner Installation

Installation is easy because the complete cooling system is contained within the machine, so that the only link to outside is via two holes though the external wall upon which the unit is mounted. The two holes are core drilled according to a marking/drilling template and then lined with ducts which then have small circular louvers fitted to the outside end of the holes. The whole installation can be completed from inside the building thus enabling easy installation even on floor levels above the ground floor without the worry of scaffolding. The great advantage of these type of machines is that because the is no external unit they can usually be installed without planning permission, even on quite sensitive areas.

 

 

Unico Air

Unico Air 1.8 kw cooling output

 

unico 4

Unico Easy. 2.05 kw output (cooling only) or 1.9kw cooling/heating output (heat pump model)

 

Some Unico models are as effective mounted in a high wall position as they are mounted at mid level or low-level

 

Unico Wall Mounted Air Conditioner

Neat and attractive from on the inside

 

Wall Mounted Air Conditioners where externally there is only 2 small louvered vents outside  and a condesate drain pipe

Unobtrusive on the outside. Only 2 small louvered vents outside and a condensate drain pipe to give it away.

Cooling Capacity

The Broughton Mighty Cool range Cooling Capacity

The Broughton Mighty Cool range

With a tad of winter still in the air we are already looking forward to moving from the ‘cold’ season to the ‘cooling’ season. Some interesting products fill the range this year with one or two new comers and several of the old campaigners revised for the coming season.

As was the case last year, head of pack on all fronts in mobile cooling is  Broughton with the Mighty Cool range of industrial air conditioners and evaporative coolers, but there is stiff competition from other machines in particular segments.

 

 

Comparison of the Industrial Mobile Monoblock Range and its Cooling Capacity…

Manufacturer Broughton Broughton Broughton TitanCool TitanCool CoolMobile  Fral

mcm230 Cooling Capacity

MCM 230

Broughton MCM280 industrial Monoblock air conditioner Cooling Capacity

MCM280

MCM350 for thumbnail Cooling Capacity

MCM350

industrial spot cooler Cooling Capacity

TC21

industrial spot cooler Cooling Capacity

TC25

CoolMobile CM25 spot cooler Cooling Capacity

CM25

Fral Bizzard industrial monoblock air conditioner Cooling Capacity

Blizzard

Model MCM230 MCM280 MCM350  TC21  TC25  CM25  Blizzard
Capacity (BTU)  23000  28000 35000  21000  25000  25000  25000
Dimensions (mm)  1080 x 530 x 690  1110 x 530 x 690  1200 x 970 x 665  1240 x 560 x 620  1240 x 560 x 620  1303 x 490 x 600  1250 x 505 x 620
Price ex VAT (incl. uk delivery) (correct at time of writing)  £1480  £2150  £2933  £1880  £2230  £2286  £1850
Worth knowing…
  • there is also a 110v version
  • price includes 2.5m exhaust duct
  • can be ducted up to 10m
  • tough controls
  • there is also a 110v version
  • price includes 2.5m exhaust duct
  • can be ducted up to 10m
  • tough controls
  • there is also a 110v version
  • price includes 2.5m exhaust duct
  • can be ducted up to 10m
  • tough controls
  • option for high pressure air box
  • blister button control panel
  • exhaust air can be ducted up to 9m
  • semi rigid cold air ducts standard
  • blister button control panel
  • exhaust air can be ducted up to 9m
  • semi rigid cold air ducts standard
  •  only 55 db(A)
  • exhaust air can be ducted up to 9m
  • tough controls

 

Although the MCM230 is a run away champ for value for 23000BTU, the obvious choice at 25000 BTU is the Fral Blizzard and on the larger sizes 28000, and 35000 BTU cooling capacity, the MCM range has no competition.

Looking at the big split units…

Manufacturer Broughton Broughton  Fral Calorex Prem-i-air

MCWS250 Cooling Capacity

MCWS250

mcws500 Cooling Capacity

MCWS500

Fral Avalanch Cooling Capacity

Avalanch

Portatemp 4500W Cooling Capacity

Portatemp 4500W

eh1413 15000btu split air conditioner Cooling Capacity

EH1413

Model MCWS 250 MCWS 500 Avalanche Portatemp 4500w EH1413
Capacity (BTU) 25000 50000 23000 15400 15000
Dimensions of inside unit  (mm) 1350 x 820 x 380 1835 x 670 x 450 1030 x 820 x 360 950 x 700 x 330 695 x 470 x 335
Dimensions of outside unit  (mm)  N/K   N/K  N/K  N/K 490 x 510 x 230
Price ex VAT (incl. uk delivery) (correct at time of writing) £2998 £5413 £2950 £3318 £825
Worth knowing…
  • 110v version available
  • water lines up to 35m
  • chunky controls
  • cools down to 9°C
  • quick connect water lines
  • water lines up to 35m
  • chunky controls
  • cools down to 9°C
  • quick connect water lines
  • only 49db(A)
  • water lines up to 30m
  • quick connect water lines
  • Hot Gas Defrost allows low
    temperature operation
  • Extend water lines up to 35 metres
  • quick connect water lines
  • blister button controls
  • 2.5 m pipes only
  • refrigerant pipelines
  • permanently connected lines

 

At the 25000BTU level the MCWS250 offers good value and is only slightly more expensive that the marginally less powerful avalanche. Although it may appear expensive for 15400BTU capacity the Portatemp 4500w is well featured and is a winner if you need to get to very cold temperatures. The EH1413 is included with the water-cooled, metal cased units for now other reason that it would otherwise be in a category of its own. Although the EH1413 is not particularly costly, it is severely limited in comparison to the others by having short, permanently connected lines with refrigerant rather than water.

And lastly the big mobile evaporative coolers…

Manufacturer Broughton Fresc Mann Fresc Mann Fresc Mann Prem-i-air

Broughton Comcool 5000 m3/hr evaporative cooler. Cooling Capacity

Comcool

Fresc Mann mobile evaporative cooler. Cooling Capacity

FR-07/050 inverter

Fresc Mann mobile evaporative cooler. Cooling Capacity

FR-09/050 1 speed

Fresc Mann mobile evaporative cooler. Cooling Capacity

FR-12/075 Inverter

EH1616 Remote Control Evaporative Air Cooler with 57 L Water Tank. Cooling Capacity

EH1616

Model Comcool FR-07/050 inverter FR-09/050 1 speed FR-12/075 Inverter EH1616
Capacity (m3/hr) 5165 4200 9000 12000 8000
Tank 90 litres 10 litres 20 litres 20 litres 57 litres
Dimensions  (mm) 1660 x 640 x 500 825 x 825 x 750 1135 x 1135 x 2110 1135 x 1135 x 2110 1380 x 800 x 480
Price ex VAT (incl. uk delivery) (correct at time of writing) £1599 £2047 £2830 £3596 £318
Worth knowing…
  • Has mains water connection
  • Has a diaphragm pump
  • Tank drain system
  • chunky controls
  • inverter speed control
  • very well featured machine
  • some structural components
    have 10 year warranty
  • very large wetted pad area
    relative to airflow
  • 65% cooling panel efficiency
  • comes c/w water supply hose
  • very well featured machine
  • some structural components
    have 10 year warranty
  • very large wetted pad area
    relative to airflow
  • 66% cooling panel efficiency
  • comes c/w water supply hose
  • fan runs from 415v 3ph supply
  • inverter speed control
  • very well featured machine
  • some structural components
    have 10 year warranty
  • very large wetted pad area
    relative to airflow
  • 78% cooling panel efficiency
  • comes c/w water supply hose
  • fan runs from 415v 3ph supply
  • blister button controls
  • Has mains water connection

 

It is a strange comparison. We have an 8000 m3/hr evaporative cooler at only £318, which would make you ask why is it so much lower in price than the others. The simple answer is quality of components. You can be certain that the lower priced machine is not a long-term prospect compared the others. On the other hand with the Fresc Mann machines (we have only shown 3 here but there are several others) you have good quality components, very high cooling efficiency, ready availability of spares should you ever need them, and great functionality including a rotatable discharge diffuser.  The Comcool is at the very tough end of the spectrum, made in tough steel throughout and with tough controls, the Comcool is in it for the long haul.

 

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