27
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 evapo-
rator 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).
48HJ012 (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
48HJ014 (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
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
To Next Page
Loading...
