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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.

(space) –

(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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