 |
Performance Adjustment Factors |
Figure 21.1 -- Air Density Ratios
| Air Density Ratio (Density at New Air Density)
Condition/Std. |
 Rooftop Leaving Air Temperature (degrees F) |
Table 21-1 — Enthalpy of Saturated Air
| 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 21-2 - Cooling Capacity Altitude
Correction Factors
Altutide
(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 |
Table 21-3 - Gas Heating Capacity Altitude
Correction Factors
| Altutide
(Ft.) |
| |
Sea Level To 2000 |
2000 To 2500 |
2501 To 3500 |
3501 To 4500 |
4501 To 5500 |
5501 To 6500 |
6501 To 7500 |
| Capacity Multiplier |
1.00 |
.92 |
.88 |
.84 |
.80 |
.76 |
.72 |
|
