Ambient Dry Bulb Temperature (°C) | Ambient Relative Humidity | ||||||||
10.00% | 20.00% | 30.00% | 40.00% | 50.00% | 60.00% | 70.00% | 80.00% | 90.00% | |
10 | 2.9 | 4 | 4.6 | 5.4 | 6.3 | 7.2 | 8 | 8.5 | 9.4 |
15 | 6.5 | 8.1 | 8.5 | 10 | 10.6 | 11.5 | 12.5 | 13.2 | 14.2 |
20 | 10.1 | 10.4 | 12.8 | 13.7 | 15 | 16.1 | 17.2 | 18.1 | 19 |
25 | 13.8 | 15.2 | 17 | 18.2 | 19.4 | 20.5 | 21.6 | 22.8 | 24 |
30 | 16.6 | 18.8 | 20 | 22.1 | 23.5 | 24.9 | 26 | 27.2 | 28.8 |
35 | 20 | 24 | 24.2 | 26 | 28.1 | 29.9 | 31 | 32.2 | 33.4 |
40 | 23 | 28.1 | 29 | 30.5 | 32.2 | 33.7 | N/A | N/A | N/A |
45 | 25.7 | 29 | 32 | 34.2 | N/A | N/A | N/A | N/A | N/A |
50 | 29 | 32.5 | 35.6 | N/A | N/A | N/A | N/A | N/A | N/A |
Formula as below:
1. Quantity of coolers N =(V*n)/Q
2. Ventilation frequency n =(Q*N)/V
For example:
If you need cooling down the factory area 1000 M2, height 4M (assuming the factory does not have heat equipment) ,there the ventilation frequency should be 25-30 times/h,and you choose 18000 M3/h cooler.
So V=1000*4=4000 M3
N = (4000*30)/18000=6.6(so you should install 7 pcs coolers).