Suspended Indirect Heaters

When customers browse in the suspended indirect heaters section of the Puravent website, there is a somewhat bewildering array of products. We are often asked about the relative merits of one range of suspended heaters compared to another range of suspended heaters, and in the process we occasionally find that we also get a bit confused by the different types. So in an effort to bring some clarity and comparison between the various ranges is seems that a bit more information is required. So whether it is a gas-fired suspended heater or oil-fired suspended heater that you are looking for, this page should help to shine a little light on the options.

Applications for Suspended Indirect Heaters

Suspended indirect heaters are more often than not used in agricultural and horticultural applications. Their relative ease of installation and versatility within sometimes difficult buildings such as green houses, poly tunnels and poultry houses means that they are favoured in these type of environments. These types of environments can be wet, corrosive and can have very exacting demands on control of heaters and as such there are typically various options on constriction materials, controls and air intakes to meet these various requirements.

The Biemmedue Range of Suspended Indirect Heaters

The Biemmedue range of suspended Indirect heaters are manufactured in Italy and cover most of the requirements that are found in these horticultural and agricultural building applications. They have 3 ranges, EC/S, which is basically the suspended heater version of their well established EC range of mobile oil-fired indirect heaters, BH which are a relatively new and which are suited to more difficult environments, and FARM which are perhaps the most versatile products with a wider and higher range of heating capacities, as well as the option for a centrifugal fan which is a requirement if the heated air needs to be ducted from the heater.

Range Name	EC/S	BH	FARM
Looks like
Capacities	51kw 81kw	44kw 90kw	71kw 91kw 116kw 151kw 192kw
Fuel	oil	oil	oil
Burner	Automatic built-in oil burner	Automatic oil burner	Automatic oil burner
Construction	Steel	High-grade AISI 430 stainless steel body and combustion chamber	Steel frame (FARM 150, FARM 200) Double skinned body for thermo-acoustic insulation and safe low surface temperature Hanging devices fitted with suspending eyes for ceiling mounting High temperature resistant heat exchanger
Material combustion chamber	AISI 430 Stainless steel combustion chamber with four smoke revolutions	Four smoke loops AISI 430 stainless steel combustion chamber	Stainless steel combustion chamber with aerodynamic shape
Safety	Safety thermostat	Safety OVERHEATING manual reset thermostat
Connection options	thermostat or, humidistat or, timer	thermostat or, humidistat or, timer climate computer	thermostat or, humidistat or, timer
Fan	Helicoidal fan	Helicoidal tipping fan for easy burner maintenance or replacement	Helicoidal fan or centrifugal (suggested in case of connection with long air duct as it ensures greater pressure)
Control	Electric control panel	Electric control panel	Electric board
Flame control	Electronic flame-control	Electronic flame-control	Electronic flame-control
Fan only function	No	Summer-winter switch to use as a fan	Summer-winter switch for use as a fan
power cord	Yes	Yes	Yes
Automatic post ventilation of unit	Yes	Yes	Yes
other	Fuel feed lines in hydrocarbon resistant rubber, with a reinforced metal sheath	Air pressure switches LIMIT automatic thermostat to control the burner IP65 electric board grade protection Snorkel connection adapter to allow outside clean combustion air feed	Filter (oil version) Pre-heating of the combustion chamber
Schematic
Great for..	General applications, green houses, poly tunnels. Non difficult environments	More demanding applications including livestock housing, high humidity environments, corrosive environments, dusty environments (use snorkel for bringing in clean outside for for combustion)	Larger application, nurseries, poultry and other livestock housing, commercial growing

So if your poultry building, green house, or polytunnel needs some heating, whether by gas fired heaters or indirect diesel fired heaters, then get in touch and we can help you through the process.

Heat Load	Watts	BTU
Average The Room Is A Normal Residential Room, Office, Reception Area Or Similar, Where There Is Not Overly Crowded With People, Computer And Office Equipment.
Above Average There Are Factors That Contribute To Additional Heat Being Generated In The Room E.G. Strong Lighting, Overcrowding With People And Office Equipment, Conservatory Type Room, Or Flat Roofed Room.
High There Are Factors That Contribute To A High Heat Load In The Room. E.G. Commercial Cooking, Much Computer And Server Equipment, Switchgear, Temporary Building With Thin Walls And Flat Room, Plain Glass Conservatory.

Variable	Units	Notes/Guidance
System Airflow	M3/Hr	If you have it in cfm then multiply your cfm value by 1.7 to get m3/hr
Average Combined Pressure Drop Of Filters Of Higher Than F6 Efficiency	Pascals	F8 bag filters pressure drop - typical clean clean to dirty, 160 - 250 Pascals F9 compact filters pressure drop - typical clean to dirty, 160 - 350 Pascals H10 HEPA filter pressure drop - typical clean to dirty, 250 - 600 Pascals 9.8 Pascals = 1 mm wg, & 249 Pascals = 1 inch wg
Carbon Filters Pressure Drop	Pascals	For compact type carbons pressure drop between 100 - 150 Pa Bonded carbon panels typically 150 - 170 Pa Loose granular carbon panels typically 130 Pa
Annual Operational Hours	Hrs/Annum	8760 hours in a year If operating for 5 days a week, excluding public holidays, for 12 hrs/day = 3000 hrs
Cost Of Power	Pence Per Kwh	Huge variance in what different companies pay. heck your last bill to be sure, otherwise put in 10p
Fan Efficiency	(As Decimal Value, Eg 100%=1)	Would typically be around 60%, so if you don’t have specific information use 0.6
Fan Motor Efficiency	(As Decimal Value, Eg 100%=1)	Larger motors should be around 90%, so if you don’t have specific information use 0.9

The Total Average Pressure Drop Over Your Higher Efficiency Filters And/Or Carbon Filters Is;		Pascals
This Pressure Drop Is Costing In Energy Alone	£	Per year
It Is Probable That A Sanuvox In-Duct System Could Break Down The Biological, Chemical And Odourous Contaminants On This Air Flow For Between 16 And 25% Of This Running Cost	£	Lower energy cost estimate of an equivalent Sanuvox system (16%)
	£	Higher energy cost estimate of an equivalent Sanuvox system (25%)

Type Of Building	Kw Range		BTU Range
Sports Centres
Retail Premises
Office Premises
Small Industrial Unit
Medium Industrial Units
Larger Industrial Buildings
School/Community Halls
Churches

Room/building volume	m3
Temperature differential (deltaT °C)	°C

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