Ideal Gas Law
O
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For dry air O For water vapor O |
R =R^ = 1545.32 = 53 g _ lbfy(lbm _R) : Mn 28.965
R„=^ = 154532 = 85.78ft-lbf/(lbm-R) :
18.02
The following data for US STANDARD A TSMOPHERE are from ASHARE Handbook of Fundamentals (Chapter6). Several assumptions are introduced such as:
The atmosphere consists of dry air that behaves as an ideal gas.(see pg.50 in the textbook)
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Table 1 Standard Atmospheric Data for Altitudes to 10 000 m
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Data adapted from NASA (1976). |
Table 1 Standard Atmospheric Data for Altitudes to 60,000 ft
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Pressure
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Data adapted from NASA (1976). |
Reference p and T are functions of altitude. Formula for p as function of elevation Z:
P[psi] = 14.696 (1-6.8753×10"6 Zfft])5 2559 p[barj = 1.013 (1-2.256X10’6 Z[m])5 2559
Sea level: p=14.696 psi, T=59°F
Posted in Fundamentals of Heating. Ventilating, and Air-Conditioning