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COOLING LOAD BTU
The cooling load chart shows loads in Btuh as well. To use the cooling load chart, first find the design enthalpy from a
psychrometric chart using the design dry bulb and wet bulb temperatures. (See psychrometric chart on p. 11.) The
cooling load can then be found for a range of enthalpies for each ventilator.
EXAMPLE:
The cooling design dry bulb temperature for Milwaukee, WI is 87°F and the average wet bulb at that
temperature is 73°F. On the psychrometric chart the enthalpy is about 37.7 Btu/lb of dry air which will round
up to 38 Btu/lb of dry air. In the left column, at 38 Btu/lb the HRVBBLHU1250 would have an additional
cooling load of 6428 Btuh. This additional load should be taken into account when sizing the air cooling
equipment.
Outside
Enthalpy
Btu/lb
Cooling Load (Btuh) @ Inside Design Temp 75°F and 50% Relative Humidity
HRVBBLHU1150 HRVBBLHU1250 HRVBBSVC1150 HRVBBSVC1200 HRVBBLVU1150 HRVBBLVU1200 HRVBBLVU1330
30
670 1,071 780 990 770 990 1,390
31
1,090 1,741 1,300 1,650 1,290 1,650 2,310
32
1,509 2,411 1,820 2,310 1,800 2,310 3,240
33
1,928 3,080 2,340 2,970 2,310 2,970 4,170
34
2,347 3,750 2,860 3,630 2,830 3,630 5,090
35
2,766 4,419 3,380 4,290 3,340 4,290 6,020
36
3,185 5,089 3,910 4,950 3,860 4,950 6,940
37
3,604 5,759 4,430 5,610 4,370 5,610 7,870
38
4,023 6,428 4,950 6,270 4,890 6,270 8,790
39
4,442 7,098 5,470 6,930 5,400 6,930 9,720
40
4,861 7,767 5,990 7,590 5,910 7,590 10,650
41 5,280 8,437 6,510 8,250 6,430 8,250 11,570
42 5,699 9,107 7,030 8,910 6,940 8,910 12,500