
P a g e 1 2 • D R I - S T E E M D e s i g n G u i d e
D R I - S T E E M D e s i g n G u i d e • P a g e 1 3
Table 12-1:
Calculation table from economizer cycle method Sample Problem 3 (inch-pound units)
Outside
temp.
H
(space) –
H
(outside air) = Subtotal x
% of
outside air x Total air ÷ 100 = Load
°F lbs/hr/100 cfm lbs/hr/100 cfm lbs/hr/100 cfm % cfm cfm lbs/hr
-20 2.4 – 0.072 = 2.328 x 17 x 12,000 ÷ 100 = 47.49
-10 2.4 – 0.124 = 2.276 x 19 x 12,000 ÷ 100 = 51.89
0 2.4 – 0.208 = 2.192 x 21 x 12,000 ÷ 100 = 55.24
10 2.4 – 0.338 = 2.062 x 25 x 12,000 ÷ 100 = 61.86
20 2.4 – 0.545 = 1.855 x 30 x 12,000 ÷ 100 = 66.78
30 2.4 – 0.856 = 1.544 x 38 x 12,000 ÷ 100 = 70.41
40 2.4 – 1.222 = 1.178 x 50 x 12,000 ÷ 100 = 70.68
50 2.4 – 1.794 = 0.606 x 75 x 12,000 ÷ 100 = 54.54
55 2.4 – 2.140 = 0.260 x 100 x 12,000 ÷ 100 = 31.20
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