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21
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 indoor coil.
3. The SHC is based on 80 F edb temperature of air entering evap-
orator coil.
Below 80 F db, subtract (corr factor x cfm) from SHC.
Above 80 F db, add (corr factor x cfm) to SHC
.
Correction Factor = 1.10 x (1 – BF) x (db – 80).
581B120 (10 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
3000/0.03 3200/0.03 4000/0.04 5000/0.04
Temp (F) 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
63.9 79.6 92.2 65.2
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)
Temp (F) Air Entering Evaporator — Cfm/BF
3750/0.08 4300/0.09 5000/0.11 6250/0.13
Temp (F) Air Entering Evaporator — Ewb
72 67 62 72 67 62 72 67 62 72 67 62
75
TC
164.3 154.8 132.8 168.5 157.7 143.6 171.7 160.6 148.3 174.7 164.6 153.5
SHC
91.0 107.5 111.6 95.7 114.1 121.0 101.6 121.5 129.7 49.4 110.6 142.3
kW
9.56 9.43 9.18 9.67 9.44 9.26 9.75 9.51 9.25 9.83 9.61 9.38
85
TC
159.5 149.4 125.8 163.8 152.7 136.6 166.8 155.6 143.6 170.2 159.5 149.4
SHC
78.3 102.0 116.4 82.8 108.2 128.8 86.7 116.1 140.0 93.3 130.0 149.3
kW
10.60 10.50 10.19 10.47 10.49 10.27 10.81 10.57 10.33 10.92 10.69 10.43
95
TC
154.0 143.2 118.0 157.7
146.7 128.8 161.1 149.6 137.5 164.4 153.6 144.3
SHC
76.6 99.5 112.5 80.5
106.1 124.8 85.1 114.4 136.3 75.5 112.1 135.8
kW
11.59 11.62 11.41 11.64
11.71 11.49 11.78 11.80 11.56 12.08 11.90 11.69
105
TC
148.0 134.1 110.7 151.5 139.5 120.6 153.9 142.4 128.3 157.0 145.8 138.7
SHC
74.4 95.9 108.6 78.9 104.0 119.9 83.2 111.6 128.3 89.3 125.2 138.7
kW
12.94 12.69 12.36 13.04 12.77 12.45 13.10 12.84 12.57 13.18 12.93 12.76
115
TC
139.1 120.4 103.2 143.0 125.0 110.6 146.1 128.8 118.2 148.9 135.7 129.5
SHC
71.3 90.5 103.2 76.0 98.1 110.5 80.5 107.0 118.2 87.2 122.1 129.5
kW
14.12 13.83 13.50 14.20 13.93 13.63 14.29 14.03 13.78 14.37 14.14 13.97
125
TC
127.1 106.2 97.5 131.6 108.7 100.7 136.1 112.0 105.7 139.5 118.4 116.4
SHC
67.2 85.1 97.4 72.4 91.9 100.3 77.6 100.4 105.6 84.6 114.2 116.3
kW
15.31 14.99 14.65 15.42 15.08 14.85 15.51 15.18 15.03 15.60 15.28 15.22
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 heat capacity (Btuh)
1.10 x cfm
t
lwb
= wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (h
lwb
)
h
lwb
=h
ewb
–
total capacity (Btuh)
4.5 x cfm