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RT-PRC007-EN18
Performance
Adjustment
Factors
Wet Bulb Temperature Btu Per Lb.
40 15.23
41 15.70
42 16.17
43 16.66
44 17.15
45 17.65
46 18.16
47 18.68
48 19.21
49 19.75
50 20.30
51 20.86
52 21.44
53 22.02
54 22.62
55 23.22
56 23.84
57 24.48
58 25.12
59 25.78
60 26.46
61 27.15
62 27.85
63 28.57
64 29.31
65 30.06
66 30.83
67 31.62
68 32.42
69 33.25
70 34.09
71 34.95
72 35.83
73 36.74
74 37.66
75 38.61
Table PD-2 — Cooling Capacity Altitude Correction Factors
Altitude (Ft.)
Sea Level 1000 2000 3000 4000 5000 6000 7000
Cooling Capacity
Multiplier 1.00 0.99 0.99 0.98 0.97 0.96 0.95 0.94
KW Correction
Multiplier
(Compressors) 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07
SHR Correction
Multiplier 1.00 .98 .95 .93 .91 .89 .87 .85
Maximum
Condenser
Ambient 115 F 114 F 113 F 112 F 111 F 110 F 109 F 108 F
Note:
SHR = Sensible Heat Ratio
Figure PD-1 — Air Density Ratios
Altitude/Temperature Correction
Air Density
Ratio (Density
at New
Air Density)
Condition/Std.
Rooftop Leaving Air Temperature (degrees F)
Table PD-3 — Gas Heating Capacity Altitude Correction Factors
Altitude (Ft.)
Sea Level 2001 2501 3501 4501 5501 6501
To 2000 To 2500 To 3500 To 4500 To 5500 To 6500 To 7500
Capacity
Multiplier 1.00 .92 .88 .84 .80 .76 .72
Note:
Correction factors are per AGA Std 221.30 — 1964, Part VI, 6.12. Local codes may supersede.
Table PD-1— Enthalpy of Saturated AIR