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PERFORMANCE DATA (cont)
COOLING CAPACITIES, STANDARD UNITS (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.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
581B120 (10 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
3000/0.03 3200/0.03 4000/0.04 5000/0.04
Air Entering Evaporator — Ewb
72 67 62 72 67 62 72 67 62 72 67 62
75
TC 140.3 129.4 115.0 141.2 130.4 118.1 145.2 134.0 122.1 147.5 136.6 125.3
SHC 65.6 82.2 97.4 66.7 84.4 101.5 71.3 93.1 113.5 77.9 103.7 124.7
kW 7.35 7.21 7.12 7.37 7.23 7.13 7.46 7.31 7.17 7.51 7.37 7.22
85
TC 137.7 125.3 110.0 138.9 126.6 113.6 142.6 130.6 117.7 144.6 133.3 122.3
SHC 65.0 81.2 95.2 66.3 83.6 99.7 71.0 92.8 112.0 76.9 103.1 122.2
kW 8.29 8.13 8.02 8.32 8.16 8.03 8.40 8.24 8.09 8.45 8.31 8.16
95
TC 133.8 120.7 103.0 135.1
121.9 107.2 138.8 125.8 112.8 141.7 128.5 118.5
SHC 63.979.692.265.2
82.0 97.0 70.6 91.5 109.7 76.9 102.5 118.4
kW 9.33 9.16 8.98 9.35 9.18 9.00 9.44 9.27 9.07 9.51 9.33 9.19
105
TC 128.7 115.4 96.5 129.8 116.6 99.7 133.7 120.3 107.1 136.7 122.8 114.5
SHC 62.3 77.6 89.4 63.6 80.2 93.5 69.4 89.6 106.8 76.0 100.6 114.3
kW 10.46 10.28 10.00 10.47 10.30 10.07 10.57 10.38 10.21 10.66 10.43 10.31
115
TC 123.2 109.1 90.8 124.3 110.3 92.2 127.9 114.4 100.8 130.9 116.8 110.1
SHC 60.4 75.1 86.6 61.9 77.8 90.0 67.6 87.6 100.7 74.6 98.7 109.9
kW 11.66 11.47 11.20 11.68 11.51 11.25 11.77 11.60 11.41 11.89 11.66 11.58
125
TC 117.5 101.8 86.2 118.5 103.0 87.4 121.6 107.1 96.0 124.1 110.3 104.8
SHC 58.5 72.5 84.5 60.0 75.0 87.3 65.8 85.1 96.0 72.5 96.9 104.8
kW 12.99 12.77 12.50 13.02 12.81 12.55 13.10 12.92 12.74 13.19 13.01 12.91
581B150 (12
1
/
2
TONS)
Temp (F)
Air Ent
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 167.1 154.3 142.0 169.8 157.7 144.8 173.5 160.6 148.4 176.5 164.5 153.3
SHC 82.5 103.5 123.6 85.8 109.7 132.0 90.3 117.7 141.9 98.2 130.7 153.1
kW 9.44 9.18 8.95 9.50 9.26 9.01 9.60 9.33 9.07 9.68 9.43 9.17
85
TC 162.3 149.3 135.6 165.1 152.5 139.5 168.8 155.3 143.5 172.1 159.2 149.3
SHC 80.9 101.4 120.9 84.4 107.9 129.9 89.6 115.8 139.8 97.6 129.3 149.1
kW 10.49 10.18 9.97 10.55 10.27 10.02 10.67 10.32 10.11 10.75 10.43 10.21
95
TC 156.5 143.7 126.3 159.6
146.8 131.3 162.3 149.8 136.5 166.5 153.2 144.5
SHC 79.1 99.5 116.5 83.0
106.1 126.0 87.6 114.2 135.8 95.8 127.7 144.4
kW 11.60 11.30 11.01 11.69 11.39 11.10 11.75 11.47 11.20 11.87 11.56 11.35
105
TC 150.0 136.2 115.7 153.0 139.3 120.9 155.6 142.5 138.5 158.8 145.9 138.8
SHC 76.5 96.7 111.2 80.8 103.5 120.0 85.7 112.3 128.4 93.6 125.9 138.7
kW 12.76 12.42 12.09 12.83 12.52 12.20 12.91 12.62 12.32 12.96 12.72 12.52
115
TC 141.8 122.2 104.4 144.3 126.1 110.8 147.7 129.4 118.9 150.7 135.2 130.1
SHC 73.6 91.2 104.2 77.9 98.5 110.8 83.4 107.3 118.4 91.8 121.9 129.9
kW 13.85 13.55 13.22 13.94 13.64 13.35 14.05 13.73 13.50 14.15 13.86 13.70
125
TC 132.5 108.6 93.9 134.8 111.4 100.7 137.6 114.4 106.6 140.3 122.9 120.1
SHC 70.9 85.7 93.8 74.8 92.9 100.7 80.2 101.4 106.5 89.0 116.3 120.1
kW 15.04 14.66 14.44 15.14 14.75 14.55 15.23 14.85 14.72 15.29 14.94 14.84
BF — Bypass Factor
Edb — Entering Dry Bulb
Ewb — Entering Wet Bulb
kW — Compressor Motor Power Input
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
581B036-150