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20
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).
581B090 (7
1
/
2
TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
2250/0.10 3000/0.11 3750/0.14
Temp (F) Air Entering Evaporator — Ewb
72 67 62 72 67 62 72 67 62
75
TC
105.5 96.9 87.6 107.3 99.6 90.7 110.3 101.9 93.8
SHC
50.6 63.6 75.7 53.3 69.2 83.7 58.0 76.6 92.2
kW
5.15 5.07 5.04 5.16 5.11 5.06 5.20 5.13 5.07
85
TC
102.5 93.6 83.6 105.1 96.5 87.5 107.7 99.0 90.6
SHC
49.7 62.4 73.9 52.8 68.4 82.2 57.3 75.9 90.0
kW
5.86 5.79 5.73 5.89 5.82 5.77 5.93 5.86 5.78
95
TC
98.9 90.1 79.3 101.6
92.9 83.5 103.8 95.3 87.4
SHC
48.5 61.2 71.9 51.9
67.2 80.2 56.2 74.9 87.3
kW
6.65 6.58 6.49 6.69 6.61 6.53 6.72 6.64 6.57
105
TC
95.3 86.2 75.7 97.6 88.8 79.6 100.0 91.0 84.1
SHC
47.3 59.6 70.2 50.7 65.9 78.0 55.3 73.6 84.1
kW
7.51 7.44 7.31 7.55 7.48 7.36 7.59 7.50 7.41
115
TC
91.0 82.0 71.6 93.2 84.5 75.4 95.6 86.6 80.7
SHC
45.9 58.0 68.1 49.3 64.2 75.3 54.2 72.1 80.7
kW
8.43 8.33 8.20 8.46 8.37 8.27 8.52 8.42 8.34
125
TC
86.2 77.8 68.1 88.3 80.0 71.9 90.0 81.9 77.2
SHC
44.1 56.4 66.3 47.5 62.6 71.8 52.1 70.1 77.2
kW
9.38 9.29 9.14 9.43 9.34 9.24 9.47 9.38 9.32
581B102 (8
1
/
2
TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
2550/0.08 3000/0.09 3400/0.11 4250/0.13
Temp (F) Air Entering Evaporator — Ewb
72 67 62 72 67 62 72 67 62 72 67 62
75
TC
119.5 105.7 94.8 123.1 109.1 98.7 124.8 110.7 100.2 126.3 112.8 103.4
SHC
56.5 65.7 77.8 60.2 71.7 86.3 62.2 75.8 92.8 67.8 83.3 101.2
kW
5.92 5.84 5.77 5.95 5.88 5.81 5.96 5.89 5.83 5.99 5.91 5.85
85
TC
115.5 101.9 90.6 119.7 105.4 94.8 121.4 106.9 96.1 124.0 109.1 98.7
SHC
55.1 64.3 76.1 58.9 70.5 85.1 61.3 74.5 90.5 66.2 82.9 98.5
kW
6.77 6.69 6.61 6.83 6.74 6.67 6.85 6.76 6.67 6.88 6.79 6.71
95
TC
111.3 97.7 86.6 115.0
101.2 90.6 117.2 102.6 91.7 120.1 104.8 94.5
SHC
53.7 62.8 74.2 57.4
68.9 82.9 60.0 73.0 88.6 65.0 81.5 94.5
kW
7.71 7.62 7.52 7.76 7.68 7.59 7.80 7.69 7.58 7.84 7.74 7.66
105
TC
107.2 93.5 82.5 110.5 96.7 85.9 112.1 97.9 87.6 114.9 99.9 90.5
SHC
52.2 61.3 72.7 56.0 67.4 81.2 58.4 71.4 86.6 63.5 79.5 90.5
kW
8.75 8.64 8.54 8.80 8.70 8.61 8.82 8.71 8.62 8.86 8.75 8.67
115
TC
101.9 89.2 78.0 104.7 91.8 81.5 106.7 93.1 83.3 109.2 94.9 86.3
SHC
50.2 59.5 70.7 53.7 65.7 79.5 56.6 69.5 83.1 61.5 77.8 86.3
kW
9.80 9.73 9.64 9.86 9.79 9.72 9.90 9.79 9.71 9.95 9.84 9.75
125
TC
97.3 84.3 73.1 100.0 86.8 76.0 101.3 87.9 78.7 102.9 89.5 81.9
SHC
48.7 57.7 68.5 52.4 63.9 76.0 54.8 67.9 78.7 59.1 75.7 81.9
kW
11.03 10.90 10.70 11.08 10.96 10.81 11.11 10.99 10.88 11.14 11.03 10.93
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