Bryant 581A, 581B, 579F, 581C - page 243

243
PERFORMANCE DATA (cont)
COOLING CAPACITIES — STANDARD UNITS (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).
4. Use chart below for bypass factor.
581A300 (25 Tons)
Temp (F)
Air Ent
Cond
Evap Air — Cfm/BF
7,500/0.05 8,250/0.06 9,500/0.07
Evap Air — Ewb (F)
54 58 62 67 72 76 80 54 58 62 67 72 76 80 54 58 62 67 72 76 80
60 TC 287 296 304 331 359 385 408 297 304 310 336 367 390 414 311 315 319 345 375 398 421 SHC 287 274 261 220 178 145 110 297 285 273 229 185 148 110 311 303 294 246 194 152 111
kW 15.5 15.7 15.9 16.5 17.3 17.9 18.6 15.7 15.9 16 16.7 17.4 18.1 18.7 16 16.1 16.2 16.9 17.6 18.3 19
70 TC 279 286 293 318 345 367 392 288 293 298 323 350 372 397 301 303 306 329 357 381 403
SHC 279 267 255 214 173 139 105 288 278 268 224 178 142 105 301 294 287 239 188 147 105
kW 17 17.2 17.3 18 18.7 19.3 20 17.2 17.3 17.5 18.1 18.8 19.4 20.1 17.5 17.6 17.7 18.3 19 19.7 20.3
75 TC 275 281 287 311 338 360 383 283 288 293 316 343 365 388 296 298 300 323 349 372 394
SHC 275 264 252 212 170 136 102 283 274 265 221 176 139 103 296 290 284 237 185 144 103
kW 17.9 18.1 18.2 18.8 19.5 20.1 20.8 18.1 18.2 18.4 18.9 19.7 20.3 20.9 18.4 18.5 18.5 19.1 19.8 20.5 21.1
85 TC 267 272 277 299 324 345 366 274 278 282 304 329 350 370 286 287 289 311 334 355 375
SHC 267 257 247 207 165 131 97.3 274 267 259 216 171 134 97.3 286 282 278 232 1 80 139 97.3
kW 19.8 19.9 20 20.6 21.2 21.8 22.4 20 20.1 20.1 20.7 21.4 22 22.6 20.2 20.3 20.3 20.9 21.5 22.1 22.7
95 TC 259 263 267 288 311 331 350 267 270 273 293 315 335 354 278 279 281 299 322 340 358
SHC 259 251 242 202 160 126 92.5 267 261 255 212 166 129 92.5 278 276 273 227 1 75 134 92.4
kW 22.1 22.2 22.3 22.8 23.4 23.9 24.5 22.3 22.4 22.5 22.9 23.5 24 24.6 22.6 22.6 22.6 23.1 23.6 24.2 24.7
105 TC 253 256 260 279 301 318 335 260 262 264 282 304 322 338 269 270 270 287 308 326 342
SHC 253 246 239 198 156 122 87.9 260 255 250 207 162 125 87.8 269 268 267 222 1 71 129 87.7
kW 24.9 25 25.1 25.4 25.9 26.4 26.9 25.1 25.1 25.1 25.5 26 26.5 26.9 25.2 25.2 25.2 25.6 26.1 26.6 27.1
115 TC 246 249 252 270 291 305 320 253 255 256 274 294 309 323 262 262 262 277 298 312 328
SHC 246 240 235 195 152 118 83.5 253 250 246 204 158 121 83.4 262 261 261 218 167 125 83.9
kW 28.1 28.2 28.3 28.6 29 29.3 29.6 28.3 28.3 28.3 28.6 29 29.4 29.7 28.4 28.4 28.4 28.7 29.1 29.4 29.9
125 TC 238 240 242 259 279 293 305 245 246 246 262 281 295 310 253 253 253 266 284 298 313
SHC 238 234 230 190 148 114 79.2 245 243 240 199 153 116 79.7 253 253 253 214 162 120 79.9
kW 31.6 31.7 31.7 32 32.4 32.6 32.9 31.8 31.8 31.8 32.1 32.4 32.7 33 31.9 31.9 31.9 32.1 32.5 32.7 33.1
581A300 (25 Tons) (cont)
Temp (F)
Air Ent
Cond
Evap Air — Cfm/BF
10,750/0.08 12,000/0.09
Evap Air — Ewb (F)
54 58 62 67 72 76 80 54 58 62 67 72 76 80
60 TC 322 324 327 351 380 404 429 332 333 334 357 386 410 432 SHC 322 317 313 260 203 157 111 332 330 329 276 212 162 111
kW 16.3 16.4 16.4 17 17.8 18.5 19.2 16.6 16.6 16.6 17.2 18 18.6 19.2
70 TC 311 312 314 336 364 386 408 320 320 321 341 368 392 414
SHC 311 308 305 255 198 151 105 320 320 319 269 206 156 106
kW 17.8 17.8 17.9 18.4 19.2 19.8 20.5 18 18 18 18.5 19.3 20 20.6
75 TC 306 307 308 329 356 378 398 315 315 315 333 360 383 404
SHC 306 304 302 252 195 149 103 315 314 314 266 203 153 103
kW 18.7 18.7 18.7 19.3 20 20.6 21.3 18.9 18.9 18.9 19.4 20.1 20.8 21.4
85 TC 295 296 297 315 340 362 379 303 303 303 319 344 365 385
SHC 295 295 294 246 189 144 97.3 303 303 303 260 198 148 97.9
kW 20.5 20.5 20.5 21 21.7 22.3 22.8 20.7 20.7 20.7 21.1 21.8 22.4 23
95 TC 286 286 286 303 327 344 364 293 293 294 307 330 347 366
SHC 286 286 286 241 185 138 93 293 293 294 255 193 142 92.8
kW 22.7 22.7 22.7 23.1 23.8 24.3 24.9 22.9 22.9 22.9 23.2 23.9 24.4 24.9
105 TC 277 277 277 290 312 329 347 284 284 285 295 314 331 352
SHC 277 277 277 236 179 133 88.3 284 284 285 250 188 137 88.7
kW 25.4 25.4 25.4 25.7 26.2 26.7 27.2 25.5 25.6 25.6 25.8 26.3 26.7 27.3
115 TC 268 269 269 281 300 315 332 274 274 275 283 303 317 333
SHC 268 269 269 232 176 129 84.4 274 274 275 245 184 133 84
kW 28.5 28.5 28.5 28.7 29.2 29.5 30 28.6 28.6 28.6 28.8 29.2 29.5 30
125 TC 260 259 259 269 287 300 316 265 265 264 271 289 302 318
SHC 260 259 259 227 171 125 80 265 265 264 240 179 129 80.1
kW 32 32 32 32.1 32.5 32.8 33.2 32.1 32.1 32.1 32.2 32.5 32.8 33.3
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
CFM ENTERING WET-BULB (F) 54 58 62 67 72 76 80
Bypass Factor
7,500 0.407 0.208 0.097 0.104 0.123 0.000 0.000
8,250 0.443 0.256 0.110 0.112 0.128 0.000 0.000
9,500 0.494 0.324 0.138 0.123 0.136 0.000 0.000
10,750 0.536 0.380 0.181 0.134 0.145 0.000 0.000
12,000 0.571 0.427 0.232 0.145 0.154 0.000 0.000
581A155, 180