17
Performance
Adjustment
Factors
Table 17-2 Cooling Capacity Altitude Correction Factors
Altitude ft. (m)
Sea Level 1000 (304.8) 2000 (609.6) 3000 (914.4) 4000 (1219.2) 5000 (1524.0) 6000 (1828.8) 7000 (2133.6)
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 (46.1°C) 114°F (45.6°C) 113°F (45.0°C) 112°F (44.4°C) 111°F (43.9°C) 110°F (43.3°C) 109°F (42.8°C) 108°F (42.2°C)
Note:
SHR = Sensible Heat Ratio
Table 17-3 Gas Heating Capacity Altitude Correction Factors
Altitude ft. (m)
Sea Level To 2000 200 To 2500 2501 To 3500 3501 To 4500 4501 To 5500 5501 To 6500 6501 To 7500
(Sea Level To 609.6) (609.9 To 762.0) (762.3 To 1066.8) (1067.1 To 1674.4) (1371.9 To 1675.4) (1676.7 To 1981.2) (1981.5 To 2286.0)
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.
Figure 17-1 Air Density RatiosTable 17-1 Enthalpy of Saturated Air
Wet Bulb Temperature
°F °C Btu Per Lb.
40 4.4 15.23
41 5.0 15.70
42 5.5 16.17
43 6.1 16.66
44 6.7 17.15
45 7.2 17.65
46 7.8 18.16
47 8.3 18.68
48 8.9 19.21
49 9.4 19.75
50 10.0 20.30
51 10.6 20.86
52 11.1 21.44
53 11.7 22.02
54 12.2 22.62
55 12.8 23.22
56 13.3 23.84
57 13.9 24.48
58 14.4 25.12
59 15.0 25.78
60 15.6 26.46
61 16.1 27.15
62 16.7 27.85
63 17.2 28.57
64 17.8 29.31
65 18.3 30.06
66 18.9 30.83
67 19.4 31.62
68 20.0 32.42
69 20.6 33.25
70 21.1 34.09
71 21.7 34.95
72 22.2 35.83
73 22.8 36.74
74 23.3 37.66
75 23.9 38.61
