245
PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH HOT GAS REHEAT OPTION (cont)
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 — A AND B IN REHEAT, C ON
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 133 140 146 134 141 147 135 142 148 136 143 149 137 144 150
SHC 73 69 65 75 71 67 77 73 69 79 75 71 81 76 72
kW 10.7 10.7 10.8 10.7 10.7 10.8 10.7 10.7 10.8 10.7 10.7 10.8 10.7 10.7 10.8
75 TC 116 123 128 117 123 129 117 124 130 118 125 131 118 126 132
SHC 61 55 50 63 57 52 65 59 54 66 61 56 68 62 57
kW 11.8 11.8 11 .8 11.8 11. 8 11.8 11.8 11 .8 11.8 11.8 11 .8 11.8 11. 8 11.8 11.8
85 TC 98 105 111 99 106 112 99 106 112 100 107 113 100 107 113
SHC 48 41 35 50 43 37 52 45 39 54 46 40 55 48 42
kW 12.9 13.0 13.0 12.9 13.0 13.0 12.9 13.0 13.0 12.9 13.0 13.0 12.9 13.0 13.0
95 TC 81 88 94 81 88 94 81 88 95 81 89 95 81 89 95
SHC 36 28 21 38 29 22 39 31 24 41 32 25 42 34 26
kW 14.0 14.1 14.1 14.0 14.1 14.1 14.0 14.1 14.1 14.0 14.1 14.1 14.0 14.1 14.1
581A210 (18 TONS) UNIT WITH HOT GAS REHEAT IN COOLING MODE
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
5400/0.03 6300/0.04 7200/0.05 8100/0.06 9000/0.07
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 183 198 215 236 192 206 224 245 201 212 230 252 210 216 235 257 217 222 240 262
SHC 182 169 143 120 192 184 156 127 201 197 166 134 210 209 177 141 217 218 186 147
kW 11.5 11.7 11.9 12.2 11.6 11.8 12.1 12.4 11.7 11.9 12.2 12.5 11.9 11.9 12.2 12.5 12.0 12.0 12.3 12.6
85 TC 179 192 210 231 188 200 217 239 197 205 223 244 205 210 227 249 212 215 232 254
SHC 179 166 142 117 188 181 153 125 197 194 163 131 205 206 173 138 212 213 183 145
kW 12.8 13.1 13.3 13.7 13.0 13.2 13.5 13.8 13.2 13.3 13.6 13.9 13.3 13.4 13.7 14.0 13.4 13.5 13.7 14.1
95 TC 175 186 202 223 184 193 209 229 193 198 215 236 200 203 219 241 206 208 223 245
SHC 175 163 142 114 184 177 151 121 193 191 160 128 200 200 170 135 206 207 180 142
kW 14.1 14.3 14.6 14.9 14.3 14.4 14.7 15.1 14.4 14.5 14.8 15.2 14.6 14.6 14.9 15.3 14.7 14.7 15.0 15.4
105 TC 170 180 197 215 179 186 201 222 187 192 208 226 194 197 212 230 200 202 215 235
SHC 170 160 136 111 179 174 147 118 187 186 158 125 194 195 168 131 200 201 178 138
kW 15.6 15.8 16.1 16.5 15.8 15.9 16.2 16.6 15.9 16.0 16.3 16.7 16.1 16.1 16.4 16.8 16.2 16.2 16.5 16.9
115 TC 165 173 189 208 173 179 195 214 181 184 199 218 187 189 203 222 193 194 205 225
SHC 165 157 133 109 173 170 144 116 181 181 154 122 187 188 164 128 193 194 173 134
kW 17.2 17.4 17.7 18.1 17.4 17.5 17.8 18.2 17.5 17.6 17.9 18.3 17.7 17.7 18.0 18.4 17.8 17.9 18.1 18.5
125 TC 159 166 181 199 167 171 186 203 174 177 190 207 180 182 193 210 186 187 196 213
SHC 159 154 130 105 167 166 140 112 174 175 151 118 180 181 160 124 186 187 170 130
kW 18.9 19.1 19.5 19.9 19.1 19.2 19.6 20.0 19.3 19.4 19.7 20.1 19.5 19.5 19.8 20.1 19.6 19.6 19.8 20.2
581A210 (18 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B AND C OFF
Temp (F )
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
5400/0.03 6300/0.04 7200/0.05 8100/0.06 9000/0.07
Evaporator Air — Relative Humidity (%)
50 55 60 50 55 60 50 55 60 50 55 60 50 55 60
65 TC 61 63 65 62 64 66 63 65 66 63 65 67 64 66 68
SHC 38 35 34 40 37 35 41 39 37 43 41 39 44 42 40
kW 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0
75 TC 47 48 50 47 49 51 48 50 51 48 50 52 49 51 52
SHC 24 21 18 26 23 20 28 25 22 29 26 24 31 28 25
kW 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4
85 TC 32 33 35 32 34 35 33 34 36 33 35 36 34 35 37
SHC 117 313 9 514117 16129 171410
kW 5.9 5.9 5.9 5.9 5.9 5.9 5.9 5.9 5.9 5.9 5.9 5.9 5.9 5.9 5.9
95 TC 17 18 19 18 19 20 18 19 20 19 20 21 19 20 21
SHC –3 –8 –12 –1 –6 –10 1 –4 –8 3 –2 –6 4 0 –4
kW 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3
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 formula
shown below.
.10 .98 1.96 2.94 3.92 4.90
.20 .87 1.74 2.62 3.49 4.36
.30 .76 1.53 2.29 3.05 3.82
581A155-300