25
RT-PRC007-EN
Performance
Adjustment
Factors
Table PD-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 PD-3 – Gas Heating Capacity Altitude Correction Factors
Altitude ft. (m)
Sea Level To 2000
2000 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.
Table PD-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
Figure PD-1 – Air Density Ratios
