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GROSS COOLING CAPACITIES (cont)
559F240 (20 TON)
Air Entering
Evaporator
Air Entering Condenser (F)
75 85 95 105
Cfm BF
Ewb
(F)
Capacity MBtuh
Compressor
kW
Capacity MBtuh
Compressor
kW
Capacity MBtuh
Compressor
kW
Capacity MBtuh
Compressor
kW
Total Sensible Total Sensible Total Sensible Total Sensible
6000 0.06
72 274.0 130.4 16.92 264.0 127.6 18.54 252.0 124.4 20.20 240.0 120.0 21.8
67 250.0 163.6 16.40 240.0 159.8 18.00 228.0 155.4 19.52 216.0 150.8 21.00
62 226.0 194.4 15.90 216.0 189.8 17.36 204.0 184.6 18.82 190.6 178.4 20.20
7000 0.07
72 280.0 136.4 17.04 270.0 138.2 18.72 258.0 131.0 20.40 246.0 127.2 22.00
67 256.0 175.0 16.58 244.0 172.2 18.18 234.0 167.6 19.76 222.0 163.6 21.20
62 232.0 210.0 16.12 222.0 206.0 17.60 210.0 200.0 19.08 196.6 193.8 20.60
8000 0.08
72 284.0 144.0 17.22 276.0 141.8 18.96 262.0 138.8 20.60 250.0 135.0 22.20
67 260.0 186.8 16.72 250.0 183.4 18.34 238.0 178.8 19.90 226.0 175.2 21.40
62 236.0 224.0 16.22 226.0 220.0 17.74 216.0 214.0 19.28 204.0 204.0 20.80
9000 0.09
72 288.0 151.8 17.32 278.0 147.8 19.04 266.0 145.2 20.80 252.0 141.6 22.40
67 264.0 197.0 16.84 254.0 194.6 18.46 240.0 189.8 20.00 228.0 185.4 21.60
62 242.0 236.0 16.36 232.0 232.0 17.94 222.0 222.0 19.52 212.0 212.0 21.00
10,000 0.10
72 292.0 157.4 17.42 282.0 154.6 19.14 270.0 151.8 20.80 256.0 147.4 22.40
67 268.0 208.0 16.92 256.0 204.0 18.56 242.0 200.0 20.20 230.0 196.2 21.60
62 246.0 246.0 16.50 238.0 236.0 18.08 228.0 228.0 19.76 218.0 218.0 21.40
559F240 (20 TON) (cont)
Air Entering
Evaporator
Air Entering Condenser (F)
115 125
Cfm BF
Ewb
(F)
Capacity MBtuh
Compressor
kW
Capacity MBtuh
Compressor
kW
Total Sensible Total Sensible
6000 0.06
72 228.0 116.0 23.40 214.0 111.0 24.80
67 204.0 146.2 22.40 188.8 140.8 23.80
62 176.6 171.8 21.60 163.2 162.8 23.00
7000 0.07
72 232.0 123.8 23.60 218.0 118.6 25.00
67 208.0 158.4 22.60 194.2 153.4 24.00
62 184.6 184.6 22.00 174.2 174.2 23.40
8000 0.08
72 236.0 130.4 23.80 220.0 125.8 25.20
67 212.0 169.6 22.80 197.6 164.8 24.20
62 194.2 194.2 22.40 183.4 183.4 23.80
9000 0.09
72 238.0 137.2 23.80 224.0 132.0 25.40
67 214.0 180.8 23.00 199.8 175.6 24.40
62 202.0 202.0 22.60 190.6 190.4 24.00
10,000 0.10
72 240.0 144.0 24.00 226.0 139.0 25.40
67 216.0 190.8 23.20 202.0 185.2 24.60
62 208.0 206.0 22.80 196.0 195.4 24.40
LEGEND
BF — Bypass Factor
Edb — Entering Dry Bulb
Ewb — Entering Wet Bulb
kW — Compressor Motor Power Input
MBtuh — Btuh in thousands
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (1000 x MBtuh)
t=t –
ldb edb
1.10 x cfm
t = Wet-bulb temperature corresponding to enthalpy of air
lwb
leaving evaporator coil (h )
lwb
total capacity (1000 x MBtuh)
h=h –
lwb ewb
4.5 x cfm
Where: h = Enthalpy of air entering evaporator coil.
ewb
3. The sensible heat capacity is based on 80 F entering dry-bulb (edb) tempera-
ture of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from the sensible heat capacity.
Above 80 F edb, add (corr factor x cfm) to the sensible heat capacity.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
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