246
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).
581A210 (18 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, 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 90 93 95 91 94 97 92 95 98 93 96 99 94 97 100
SHC 38 35 33 40 37 35 41 39 37 43 40 38 44 42 40
kW 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8
75 TC 68 71 73 69 72 74 70 73 75 71 74 76 72 74 77
SHC 24 21 18 26 23 20 28 25 22 30 26 23 31 28 25
kW 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6
85 TC 47 49 51 47 50 52 48 50 52 49 51 53 49 51 53
SHC 117 313 9 515117 17129 181410
kW 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3
95 TC 25 27 29 26 27 29 26 28 29 26 28 30 27 29 30
SHC –2 –8 –12 0 –5 –10 2 –-3 –8 3 –2 –6 5 0 –5
kW 11.1 11.1 11 .1 11.1 11. 1 11.1 11.1 11 .1 11.1 11.1 11 .1 11.1 11. 1 11.1 11.1
581A210 (18 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, C ON
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 147 155 162 148 157 164 150 158 165 151 160 167 152 161 168
SHC 81 76 72 84 79 75 86 81 77 88 83 79 90 85 80
kW 11.9 12.0 12.0 11.9 12.0 12.0 11.9 12.0 12.0 11.9 12.0 12.0 11.9 12.0 12.0
75 TC 128 136 143 129 137 144 130 138 146 131 139 147 132 140 148
SHC 67 61 56 70 63 58 72 65 60 74 67 62 76 69 63
kW 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2
85 TC 108 117 124 109 118 125 110 118 126 110 119 127 111 120 127
SHC 54 46 39 56 48 41 58 50 43 60 52 45 61 53 46
kW 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5
95 TC 89 98 105 89 98 106 89 98 106 90 99 107 90 99 107
SHC 40 31 23 42 33 25 44 34 26 45 36 28 47 37 29
kW 15.8 15.7 15.7 15.8 15.7 15.7 15.8 15.7 15.7 15.8 15.7 15.7 15.8 15.7 15.7
581A240 (20 TONS) UNIT WITH HOT GAS REHEAT IN COOLING MODE
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
6000/0.04 7000/0.05 8000/0.06 9000/0.07 10,000/0.08
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 216 234 255 279 226 243 265 290 237 251 273 298 247 256 279 305 256 263 284 310
SHC 213 199 171 141 225 217 185 151 237 232 198 159 247 241 211 168 256 251 223 176
kW 13.9 14.2 14.6 15.0 14.0 14.4 14.8 15.3 14.3 14.5 15.0 15.4 14.5 14.6 15.1 15.6 14.6 14.8 15.2 15.7
85 TC 211 227 249 272 221 237 258 282 232 243 265 287 242 250 270 293 250 255 275 300
SHC 209 194 168 141 221 214 182 148 232 228 195 155 242 237 206 163 250 244 220 173
kW 15.4 15.8 16.2 16.7 15.7 16.0 16.4 16.9 15.9 16.1 16.6 17.1 16.1 16.3 16.7 17.2 16.3 16.4 16.8 17.4
95 TC 207 220 240 262 217 228 250 269 228 235 254 278 236 241 259 286 243 247 264 290
SHC 205 192 164 134 217 209 179 142 228 222 190 152 236 230 202 161 243 236 214 169
kW 17.2 17.5 17.9 18.4 17.4 17.7 18.2 18.6 17.7 17.9 18.3 18.8 17.9 18.0 18.4 19.0 18.1 18.2 18.6 19.1
105 TC 201 214 232 253 211 221 238 261 221 228 247 266 229 234 251 271 236 239 255 278
SHC 197 190 161 131 211 206 172 140 221 216 188 146 229 223 200 155 236 229 212 165
kW 19.0 19.3 19.8 20.3 19.3 19.5 20.0 20.6 19.5 19.7 20.2 20.7 19.8 19.9 20.3 20.8 20.0 20.0 20.4 21.0
115 TC 195 206 224 245 205 213 230 252 214 219 236 258 221 225 240 262 228 231 243 265
SHC 191 185 158 129 205 201 171 137 214 209 183 145 221 215 194 152 228 221 207 160
kW 21.0 21.3 21.8 22.4 21.3 21.5 22.0 22.7 21.6 21.7 22.2 22.8 21.8 21.9 22.3 22.9 22.0 22.1 22.4 23.0
125 TC 189 198 215 235 198 204 221 239 207 210 225 244 214 216 229 248 220 222 232 251
SHC 184 179 154 125 198 194 167 132 207 201 179 139 214 207 191 147 220 212 202 154
kW 23.1 23.4 24.0 24.7 23.5 23.7 24.2 24.8 23.8 23.9 24.4 25.0 24.0 24.1 24.5 25.1 24.2 24.3 24.6 25.2
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