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189
PERFORMANCE DATA — 579F (cont)
COOLING CAPACITIES (cont)
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).
579F300 (25 Tons)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm
7,000 8,000
Evaporator Air — Ewb (F)/BF
54/0.44 58/0.26 62/0.13 67/0.12 72/0.12 76/0.19 80/0.01 54/0.49 58/0.32 62/0.15 67/0.14 72/0.13 76/0.17 80/0.00
75
TC — 256 270 298 325 349 370 266 268 280 304 324 352 379
SHC — 243 229 198 164 133 106 266 251 246 209 168 137 107
kW — 19.3 20.0 20.3 21.0 21.6 22.2 19.5 19.6 19.9 20.5 20.9 21.8 22.4
85
TC 249 251 265 289 315 340 361 260 262 272 294 321 344 367
SHC 249 238 226 194 160 130 103 260 254 243 205 167 135 104
kW 21.3 21.3 21.7 22.4 23.1 24.3 24.4 21.6 21.6 22.0 22.5 23.3 23.9 24.6
95
TC 244 245 257 279 306 328 349 254 256 262 284 310 332 355
SHC 244 230 223 190 156 127 99 254 249 238 201 163 131 100
kW 23.6 23.5 24.1 24.6 25.6 26.2 26.7 23.8 23.9 24.1 24.8 25.5 26.2 26.9
105
TC 237 238 247 269 293 315 336 246 247 253 274 298 319 343
SHC 237 233 218 185 152 122 95 246 245 233 197 159 127 96
kW 25.9 25.9 26.3 27.0 27.8 28.5 29.2 26.3 26.3 26.5 27.2 28.0 28.7 29.5
115
TC 229 231 237 258 283 302 322 238 239 243 264 286 306 328
SHC 229 225 213 181 148 119 91 238 239 228 193 155 123 91
kW 28.6 28.6 28.9 29.6 30.3 31.2 31.9 28.9 28.9 29.1 29.7 30.6 31.4 32.1
117
TC 228 230 236 256 279 299 — 237 237 241 260 283 304 —
SHC 228 225 212 180 147 118 — 237 237 227 192 154 122 —
kW 29.1 29.1 29.4 30.2 31.0 31.7 — 29.4 29.5 29.6 30.4 31.2 31.9 —
120
TC 226 226 232 252 276 — — 234 234 238 257 280 — —
SHC 226 225 211 179 145 — — 234 234 225 190 152 — —
kW 30.0 30.0 30.3 30.9 31.8 — — 30.3 30.3 30.5 31.1 32.0 — —
579F300 (25 Tons) (cont)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm
9,000 10,000
Evaporator Air — Ewb (F)/BF
54/0.53 58/0.37 62/0.18 67/0.15 72/0.14 76/0.17 80/0.00 54/0.57 58/0.41 62/0.23 67/0.16 72/0.15 76/0.17 80/0.00
75
TC 277 276 286 310 336 361 385 286 284 291 314 341 365 390
SHC 277 269 261 221 178 142 108 286 284 274 232 186 147 108
kW 19.8 19.5 20.0 20.6 21.3 22.0 22.6 20.0 20.2 20.2 20.8 21.5 22.1 22.7
85
TC 271 272 277 300 326 349 373 278 278 282 304 330 354 378
SHC 271 264 257 217 175 139 104 278 278 269 228 182 143 105
kW 22.2 21.9 22.1 22.7 23.4 24.1 24.8 22.1 22.1 22.2 22.8 23.6 24.2 24.9
95
TC 263 263 268 289 316 337 360 270 270 273 293 319 341 364
SHC 263 263 251 213 171 135 100 270 270 262 223 177 139 101
kW 24.1 24.1 24.3 24.9 25.9 26.4 27.1 24.4 24.4 24.4 25.1 25.8 26.5 27.2
105
TC 255 255 258 278 302 326 346 261 262 264 282 306 328 352
SHC 255 255 246 208 166 132 96 261 262 254 219 173 135 97
kW
26.5 26.5 26.6 27.3 28.1 29.0 29.6 26.8 26.8 26.9 27.5 28.3 29.0 29.8
115
TC 247 246 249 267 290 311 — 253 253 255 270 293 315 —
SHC 247 246 239 204 162 127 — 253 253 245 214 168 131 —
kW 29.1 29.2 29.3 30.0 30.8 31.5 — 29.3 29.3 29.6 30.1 30.9 31.7 —
117
TC 244 244 247 265 288 308 — 251 251 253 268 291 — —
SHC 244 244 237 203 161 126 — 251 251 243 213 168 — —
kW 29.7 29.7 29.8 30.4 31.3 32.1 — 30.0 30.0 30.0 30.6 31.4 — —
120
TC 241 242 244 261 — — — 248 248 250 264 — — —
SHC 241 242 235 201 — — — 248 248 239 212 — — —
kW 30.6 30.6 30.7 31.3 — — — 30.8 30.8 31.0 31.5 — — —
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
0.05 1.04 2.07 3.11 4.14 5.18
Use formula
shown below.
0.10 0.98 1.96 2.94 3.92 4.91
0.20 0.87 1.74 2.62 3.49 4.36
0.30 0.76 1.53 2.29 3.05 3.82
0.40 0.65 1.31 1.96 2.62 3.27
0.50 0.55 1.09 1.64 2.18 2.73
0.60 0.44 0.87 1.31 1.74 2.18
0.70 0.33 0.65 0.98 1.31 1.64
579F180-300