244
PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH HOT GAS REHEAT OPTION
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
tlwb = Wet-bulb temperature corresponding to enthalpy of air leaving evapo-
rator coil (hlwb)
Where: hewb = 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.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
581A181 (15 TONS) UNIT WITH HOT GAS REHEAT IN COOLING MODE
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
4500/0.02 5250/0.03 6000/0.04 6750/0.04 7500/0.05
Air Entering Evaporator — Ewb (F)
57 62 67 72 57 62 67 72 57 62 67 72 57 62 67 72 57 62 67 72
75 TC 166 179 193 214 175 186 202 221 183 191 208 227 190 195 212 232 197 199 216 236
SHC 165 152 129 108 175 166 140 115 183 178 150 121 190 189 159 127 197 196 168 133
kW 10.4 10.6 10.7 10.9 10.5 10.6 10.8 11.0 10.6 10.7 10.9 11.1 10.7 10.7 10.9 11.2 10.8 10.8 11.0 11.2
85 TC 162 174 189 209 171 180 195 216 179 185 200 222 186 189 205 226 192 194 208 230
SHC 162 150 127 106 171 163 137 113 179 175 147 119 186 185 156 125 192 192 164 131
kW 11.7 11.9 12.1 12.3 11.8 12.0 12.1 12.4 11.9 12.0 12.2 12.5 12.0 12.1 12.3 12.5 12.1 12.1 12.3 12.6
95 TC 158 169 182 202 166 174 187 209 174 179 194 214 181 183 198 218 187 188 201 221
SHC 158 148 126 104 166 160 134 110 174 172 145 116 181 180 154 122 187 187 163 128
kW 12.7 12.9 13.1 13.3 12.9 13.0 13.2 13.4 13.0 13.0 13.2 13.5 13.1 13.1 13.3 13.6 13.1 13.2 13.4 13.6
105 TC 153 163 178 195 162 168 181 201 169 172 188 206 175 177 191 209 181 181 194 213
SHC 153 145 123 101 162 157 133 107 169 167 142 113 175 175 151 119 181 181 160 125
kW 14.1 14.2 14.4 14.7 14.2 14.3 14.5 14.8 14.3 14.3 14.6 14.8 14.4 14.4 14.6 14.9 14.5 14.5 14.7 14.9
115 TC 148 156 171 188 157 161 176 193 163 165 180 197 169 170 183 201 174 175 185 203
SHC 148 141 120 98 157 153 130 104 163 162 139 110 169 169 148 116 174 174 156 122
kW 15.5 15.6 15.8 16.1 15.6 15.7 15.9 16.2 15.7 15.8 16.0 16.3 15.8 15.8 16.1 16.3 15.9 15.9 16.1 16.4
125 TC 143 149 163 179 151 153 168 184 157 158 171 188 163 163 174 190 167 167 176 192
SHC 143 138 117 95 151 149 126 101 157 156 136 107 163 163 144 112 167 167 153 118
kW 17.0 17.1 17.4 17.7 17.2 17.2 17.5 17.8 17.3 17.3 17.6 17.8 17.4 17.4 17.6 17.9 17.5 17.5 17.6 17.9
581A181 (15 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B AND C OFF
Temp (F )
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
4500/0.12 5250/0.14 6000/.015 6750/0.18 7500/0.18
Evaporator Air — Relative Humidity (%)
50 55 60 50 55 60 50 55 60 50 55 60 50 55 60
65 TC 55 57 59 56 58 59 56 58 60 57 59 60 57 59 61
SHC 34 32 30 36 34 32 37 35 33 38 36 35 40 38 36
kW 4.4 4.5 4.5 4.4 4.5 4.5 4.4 4.5 4.5 4.4 4.5 4.5 4.4 4.5 4.5
75 TC 42 44 45 43 44 46 43 45 46 43 45 46 44 45 47
SHC 22 19 17 23 21 18 25 22 20 26 24 21 28 25 23
kW 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8
85 TC 29 30 31 29 31 32 30 31 32 30 32 33 31 32 33
SHC 96 31185131071411816129
kW 5.2 5.2 5.3 5.2 5.2 5.3 5.2 5.2 5.3 5.2 5.2 5.3 5.2 5.2 5.3
95 TC 15 16 17 16 17 18 16 18 18 17 18 19 17 18 19
SHC –3 –7 –11 –1 –5 –9 1 –3 –7 2 –2 –5 4 0 –4
kW 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6
581A181 (15 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, C OFF
Temp (F )
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
4500/0.12 5250/0.14 6000/.015 6750/0.18 7500/0.18
Evaporator Air — Relative Humidity (%)
50 55 60 50 55 60 50 55 60 50 55 60 50 55 60
65 TC 81 84 86 82 85 87 83 86 88 84 87 89 85 87 90
SHC 34 32 30 36 33 31 37 35 33 39 36 34 40 38 36
kW 7.8 7.9 7.9 7.8 7.9 7.9 7.8 7.9 7.9 7.8 7.9 7.9 7.8 7.9 7.9
75 TC 62 64 66 62 65 67 63 66 68 64 66 68 64 67 69
SHC 22 19 16 24 21 18 25 22 20 27 24 21 28 25 22
kW 8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5
85 TC 42 44 46 43 45 46 43 45 47 44 46 48 44 46 48
SHC 10 6 2 12 8 4 14 10 6 15 11 8 16 13 9
kW 9.2 9.2 9.3 9.2 9.2 9.3 9.2 9.2 9.3 9.2 9.2 9.3 9.2 9.2 9.3
95 TC 23 24 26 23 25 26 24 25 27 24 26 27 24 26 27
SHC –2 –7 –11 0 –5 –9 2 –3 –7 3 –1 –6 5 0 –4
kW 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9
BF — Bypass Factor
Edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Compressor Motor Power Input
ldb — Leaving Dry-Bulb
lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity (1000 Btuh) Gross
TC — Total Capacity (1000 Btuh) Gross
tldb = tedb – sensible capacity (Btuh)
1.10 x cfm
hlwb = hewb – total capacity (Btuh)
4.5 x cfm
BYPASS
FACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)
79 78 77 76 75 under 75
81 82 83 84 85 over 85
Correction Factor
.05 1.04 2.07 3.11 4.14 5.18 Use for-
mula
shown
below.
.10 .981.962.943.924.90
.20 .871.742.623.494.36
.30 .761.532.293.053.82