User Guide

36
PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
Standard Ratings
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
Where: h
ewb
= Enthalpy of air entering evaporator coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
580F151 (12
1
/
2
TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
3750/0.08 4300/0.09 5000/0.11 6250/0.13
Air Entering Evaporator — Ewb
72 67 62 72 67 62 72 67 62 72 67 62
75
TC 164.6 152.0 139.9 167.3 155.3 142.6 170.9 158.2 146.2 173.9 162.0 151.0
SHC 81.3 101.9 121.7 84.5 108.1 130.0 88.9 115.9 139.8 96.7 128.7 150.8
kW 10.24 9.96 9.71 10.31 10.05 9.78 10.42 10.12 9.84 10.50 10.23 9.95
85
TC 159.9 147.1 133.6 162.6 150.2 137.4 166.3 153.0 141.3 169.5 156.8 147.1
SHC 79.7 99.9 119.1 83.1 106.3 128.0 88.3 114.1 137.7 96.1 127.4 146.9
kW 11.38 11.05 10.82 11.45 11.14 10.87 11.58 11.20 10.97 11.66 11.32 11.08
95
TC 154.2 141.5 124.4 157.2
144.6 129.3 159.9 147.6 134.5 164.0 150.9 142.3
SHC 77.9 98.0 114.8 81.8 104.5 124.1 86.3 112.5 133.8 94.4 125.8 142.2
kW 12.59 12.26 11.95 12.68
12.36 12.04 12.75 12.44 12.15 12.88 12.54 12.31
105
TC 147.8 134.2 114.0 150.7 137.2 119.1 153.3 140.4 136.4 156.4 143.7 136.7
SHC 75.4 95.2 109.5 79.6 101.9 118.2 84.4 110.6 126.5 92.2 124.0 136.6
kW 13.84 13.48 13.12 13.92 13.58 13.24 14.01 13.69 13.37 14.06 13.80 13.58
115
TC 139.7 120.4 102.8 142.1 124.2 109.1 145.5 127.5 117.1 148.4 133.2 128.1
SHC 72.5 89.8 102.6 76.7 97.0 109.1 82.1 105.7 116.6 90.4 120.1 128.0
kW 15.03 14.70 14.34 15.12 14.80 15.24 15.24 14.90 14.65 15.35 15.04 14.86
125
TC 130.5 107.0 92.5 132.8 109.7 135.5 135.5 112.7 105.0 138.2 121.1 118.3
SHC 69.8 84.4 92.4 73.7 91.5 99.2 79.0 99.9 104.9 87.7 114.6 118.3
kW 16.32 15.91 15.67 16.43 16.00 15.79 16.52 16.11 15.97 16.59 16.21 16.10
BF — Bypass Factor
Edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Compressor Motor Power Input
Ldb — Leaving Dry-Bulb
Lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity (1000 Btuh) Gross
TC — Total Capacity (1000 Btuh) Gross
t
ldb
=t
edb
–
sensible capacity (Btuh)
1.10 x cfm
t
lwb
= Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (h
lwb
)
h
lwb
=h
ewb
–
total capacity (Btuh)
4.5 x cfm
BYPASS
FACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)
79 78 77 76 75 under 75
81 82 83 84 85 over 85
Correction Factor
.05 1.04 2.07 3.11 4.14 5.18
Use formula
shown below.
.10 .98 1.96 2.94 3.92 4.90
.20 .87 1.74 2.62 3.49 4.36
.30 .76 1.53 2.29 3.05 3.82
580F036-151