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141
PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
COOLING CAPACITIES LEGEND AND NOTES
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 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).
558F300 (25 TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
7,000/0.05 8,000/0.06 9,000/0.07 10,000/0.08 11,250/0.09
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
256 271 299 327 267 278 305 336 276 283 309 341 285 286 313 344 294 294 316 347
SHC
256 232 196 159 267 249 208 166 276 265 220 173 285 281 232 182 294 294 252 198
kW
18.0 18.3 18.9 19.6 18.3 18.5 19.1 19.8 18.5 18.7 19.2 19.9 18.7 18.8 19.4 20.1 19.0 19.0 19.5 20.2
85
TC
248 262 288 316 259 267 293 322 267 273 298 328 276 276 302 331 284 285 305 336
SHC
248 228 192 154 259 244 204 161 267 259 216 169 276 274 228 175 284 284 244 187
kW
20.0 20.4 20.9 21.5 20.3 20.4 21 21.7 20.6 20.6 21.2 21.9 20.8 20.8 21.3 22 21 21 21.5 22.1
95
TC
241 252 277 303 251 257 281 309 259 262 286 314 266 267 290 317 274 275 293 321
SHC
241 223 187 149 251 239 198 157 259 254 210 164 266 265 222 171 274 275 238 180
kW
22.4 22.6 23.1 23.7 22.6 22.7 23.3 23.9 22.8 22.9 23.4 24 23 23 23.5 24.2 23.2 23.2 23.6 24.2
105
TC
233 243 266 289 242 247 270 295 250 252 273 299 256 258 277 303 264 265 280 306
SHC
233 218 182 145 242 233 194 152 250 248 206 159 256 257 217 166 264 265 232 176
kW
24.9 25.1 25.6 26.2 25.2 25.3 25.8 26.3 25.4 25.4 25.9 26.5 25.6 25.6 26 26.6 25.8 25.8 26.1 26.7
115
TC
225 232 254 277 234 236 258 281 241 242 261 285 247 247 264 288 254 255 267 291
SHC
225 214 178 140 234 228 189 148 241 241 201 155 247 247 211 162 253 255 227 171
kW
27.9 27.9 28.5 29 28 28.1 28.6 29.2 28.2 28.2 28.7 29.2 28.4 28.4 28.8 29.3 28.7 28.7 28.9 29.5
125
TC
216 221 241 263 224 225 245 267 231 231 248 269 237 236 251 273 243 242 253 276
SHC
216 208 173 136 223 221 184 142 230 231 196 149 236 236 206 157 243 242 221 166
kW
30.9 31.1 31.6 32 31.2 31.2 31.7 32.2 31.4 31.4 31.7 32.3 31.6 31.6 31.9 32.3 31.7 31.7 31.9 32.5
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
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
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
0TFQ004-012
558F180-300