Bryant 581A/B - Manual (Page 211)

211
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.
581A240 (20 Tons)
Temp (F)
Air Ent
Cond
Evap Air — Cfm/BF
6,000/0.04 7,000/0.05 8,000/0.05
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 235 242 248 267 288 306 323 247 251 256 274 296 312 330 257 259 262 279 300 317 333
SHC 235 224 212 178 143 115 86.6 247 238 230 191 151 119 87 257 251 246 204 159 123 86.7
kW 11.5 11.6 11.7 12 12.4 12.7 13 11.7 11.8 11.8 12.1 12.5 12.8 13.1 11.9 11.9 11.9 12.2 12.6 12.9 13.1
70
TC 231 237 242 261 282 300 316 242 246 250 268 289 305 323 252 254 256 273 293 310 326
SHC 231 220 209 175 141 113 84.5 242 234 227 189 149 117 84.9 252 247 243 201 156 120 84.6
kW 13.1 13.2 13.3 13.6 14 14.3 14.6 13.3 13.3 13.4 13.7 14.1 14.4 14.8 13.4 13.5 13.5 13.8 14.2 14.5 14.8
75
TC 228 234 239 257 278 295 311 239 243 246 264 285 301 318 249 250 252 269 290 305 322
SHC 228 218 208 174 139 112 83.1 239 232 225 187 147 115 83.6 249 245 241 199 155 119 83.5
kW 13.9 14 14.1 14.5 14.9 15.2 15.6 14.1 14.2 14.2 14.6 15 15.3 15.7 14.3 14.3 14.4 14.7 15.1 15.4 15.8
85
TC 223 227 231 250 270 287 303 234 236 238 256 277 292 310 243 244 245 261 282 296 314
SHC 223 213 204 171 136 109 80.5 234 227 221 184 144 112 80.9 243 240 236 196 152 116 81.3
kW 15.6 15.7 15.8 16.2 16.6 17.1 17.4 15.8 15.9 15.9 16.3 16.8 17.2 17.6 16 16.1 16.1 16.5 16.9 17.3 17.7
95
TC 216 219 223 241 260 277 292 226 228 230 247 267 282 298 235 235 236 251 272 285 303
SHC 216 208 200 167 132 105 77.2 226 221 217 180 141 109 77.7 235 233 231 192 148 112 78
kW 17.4 17.5 17.6 18.1 18.6 19 19.4 17.7 17.7 17.8 18.2 18.7 19.1 19.6 17.9 17.9 17.9 18.3 18.9 19.2 19.7
105
TC 208 211 214 231 249 265 279 218 219 220 236 256 270 285 226 226 226 241 260 273 290
SHC 208 202 195 163 129 101 73.6 218 215 212 176 137 105 74 226 226 225 188 145 108 74.4
kW 19.3 19.4 19.5 20 20.6 21 21.5 19.6 19.6 19.7 20.2 20.8 21.2 21.6 19.9 19.9 19.9 20.3 20.9 21.3 21.8
115
TC 200 202 204 220 237 253 266 209 210 210 225 243 257 271 217 217 217 229 248 260 275
SHC 200 195 190 158 124 97.2 69.5 209 207 206 171 132 101 70 217 217 217 183 140 104 70.4
kW 21.3 21.4 21.5 22 22.7 23.2 23.6 21.7 21.7 21.7 22.2 22.9 23.3 23.8 21.9 21.9 21.9 22.4 23 23.4 23.9
125
TC 191 192 193 208 224 239 251 199 199 200 212 230 243 255 207 207 206 216 232 245 257
SHC 191 188 185 153 120 92.8 65.3 199 199 199 166 128 96.4 65.7 207 207 206 178 135 99.8 65.5
kW 23.5 23.5 23.6 24.2 24.8 25.4 25.9 23.8 23.8 23.8 24.4 25 25.5 26 24.1 24.1 24.1 24.5 25.1 25.7 26.1
581A240 (20 Tons) (cont)
Temp (F)
Air Ent
Cond
Evap Air — Cfm/BF
9,000/0.06 10,000/0.07
Evap Air — Ewb (F)
54 58 62 67 72 76 80 54 58 62 67 72 76 80
60
TC 265 266 267 284 305 321 338 272 272 272 287 307 325 340
SHC 265 262 260 216 166 126 87 272 271 271 227 173 130 86.7
kW 12 12 12 12.3 12.7 12.9 13.2 12.1 12.1 12.1 12.4 12.7 13 13.3
70
TC 260 261 261 277 298 315 331 266 267 267 281 301 317 333
SHC 260 258 256 213 164 124 85 266 267 267 225 171 127 84.7
kW 13.6 13.6 13.6 13.9 14.3 14.6 14.9 13.7 13.7 13.7 14 14.3 14.6 15
75
TC 256 257 258 273 294 310 326 263 263 263 277 296 312 327
SHC 256 255 254 211 162 123 83.7 263 263 263 223 169 126 83.4
kW 14.5 14.5 14.5 14.8 15.2 15.5 15.8 14.6 14.6 14.6 14.9 15.2 15.6 15.9
85
TC 250 250 250 265 285 301 316 257 256 256 268 287 303 317
SHC 250 250 249 208 159 120 81 257 256 256 220 166 123 80.7
kW 16.2 16.2 16.2 16.5 17 17.4 17.7 16.4 16.4 16.4 16.6 17 17.4 17.7
95
TC 242 242 242 255 274 288 304 248 248 248 258 276 292 306
SHC 242 242 242 204 155 116 77.8 248 248 248 215 162 120 77.6
kW 18.1 18.1 18.1 18.4 18.9 19.3 19.7 18.3 18.3 18.2 18.5 19 19.4 19.7
105
TC 233 233 233 244 263 275 291 239 239 239 247 264 279 291
SHC 233 233 233 200 152 112 74.2 239 239 239 211 158 116 73.9
kW 20.1 20.1 20.1 20.4 21 21.4 21.8 20.3 20.2 20.2 20.5 21 21.5 21.8
115
TC 223 223 223 232 250 262 276 229 228 228 235 251 263 276
SHC 223 223 223 195 147 108 70.2 229 228 228 206 154 111 69.9
kW 22.2 22.1 22.1 22.5 23.1 23.5 24 22.3 22.3 22.3 22.6 23.1 23.6 24
125
TC 213 212 212 219 234 247 258 218 217 217 222 235 248 259
SHC 213 212 212 189 142 103 65.4 218 217 217 200 148 106 65.2
kW 24.3 24.3 24.3 24.6 25.2 25.7 26.2 24.5 24.5 24.5 24.7 25.3 25.8 26.2
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
CFM
ENTERING WET-BULB (F)
54 58 62 67 72 76 80
Bypass Factor
6,000 0.386 0.197 0.108 0.109 0.134 0.000 0.000
7,000 0.444 0.260 0.131 0.121 0.138 0.000 0.000
8,000 0.492 0.321 0.163 0.133 0.145 0.000 0.000
9,000 0.532 0.375 0.205 0.146 0.154 0.000 0.000
10,000 0.566 0.420 0.245 0.158 0.164 0.000 0.000
5
81A1
55-
30
0