evaporative cooler

How Much Evaporative Cooling?

Evaporative cooling flowrate, i.e. the airflow, required for effective evaporative cooling is specified according the building type and its volume in m3. When sizing a system we do not always take the complete building volume but do take the effective cooled volume which would for example exclude the air space above the ducts if the ducted cool air is to be introduced at a high level and directed down. Different types of building use demand different amounts of cooling. The following table is a guide which expresses the quantity range of air changes in differnt application types;

Building usage

Air changes base on cooling using 50mm panels

Air changes base on cooling using 100mm panels

Textile industries

25-29

22-26

Rag workshops

22-25

20-22

Machine rooms

18-22

16-20

Manufacturing trade

18-22

16-20

Foundries

25-30

22-27

Painting workshops

25-30

22-27

Plastic manufactures

30-35

27-31

Bakeries

20-25

18-22

Restaurants

18-22

16-20

Cafes and bars

18-22

16-20

Canteens

18-22

16-20

Entertainment Halls

25-29

22-26

Wine cellars

30-40

27-36

Discotheques and pubs

25-29

22-26

Cinemas and theatres

14-18

13-16

Multiply the effective cooled volume by the air change rate to get the total airflow in m3/hr. This is the airflow that the evaporative cooler needs to achieve. If you have a large or complex building it may make sense to break down the volume into zones or sections. Each zone or section might have particular features which will influence the choice of air change rate, such as activity type or anticipated supply ducting height.

It is at this point in specifying your evaporative cooler, that you may want to give us a call so that we can help you fine tune the selection of unit(s). Once we have decided which units to use we can calculate the anticipated performance of the evaporative coolers in your application.