Bryant 579F User Manual page 242

581A240 (20 Tons)
Temp (F)
Air Ent
Cond
54 58 62
TC 235 242 248
60 SHC 235 224 212
kW 11.5 11.6 11.7
TC 231 237 242
SHC 231 220 209
70
kW 13.1 13.2 13.3
TC 228 234 239
SHC 228 218 208
75
kW 13.9 14 14.1
TC 223 227 231
SHC 223 213 204
85
kW 15.6 15.7 15.8
TC 216 219 223
SHC 216 208 200
95
kW 17.4 17.5 17.6
TC 208 211 214
SHC 208 202 195
105
kW 19.3 19.4 19.5
TC 200 202 204
SHC 200 195 190
115
kW 21.3 21.4 21.5
TC 191 192 193
SHC 191 188 185
125
kW 23.5 23.5 23.6
581A240 (20 Tons) (cont)
Temp (F)
Air Ent
Cond
54 58
TC 265 266
60 SHC 265 262
kW 12 12
TC 260 261
70 SHC 260 258
kW 13.6 13.6
TC 256 257
75 SHC 256 255
kW 14.5 14.5
TC 250 250
85 SHC 250 250
kW 16.2 16.2
TC 242 242
95 SHC 242 242
kW 18.1 18.1
TC 233 233
105 SHC 233 233
kW 20.1 20.1
TC 223 223
115 SHC 223 223
kW 22.2 22.1
TC 213 212
125 SHC 213 212
kW 24.3 24.3
LEGEND
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
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
t ldb = t edb –
1.10 x cfm
t lwb = Wet-bulb temperature corresponding to enthalpy of air leaving evapo-
rator coil (h lwb )
total capacity (Btuh)
h lwb = h ewb –
4.5 x cfm
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.
PERFORMANCE DATA (cont)
COOLING CAPACITIES — STANDARD UNITS (cont)
6,000/0.04
67 72 76 80 54
267 288 306 323 247
178 143 115 86.6 247
12 12.4 12.7 13 11.7
261 282 300 316 242
175 141 113 84.5 242
13.6 14 14.3 14.6 13.3
257 278 295 311 239
174 139 112 83.1 239
14.5 14.9 15.2 15.6 14.1
250 270 287 303 234
171 136 109 80.5 234
16.2 16.6 17.1 17.4 15.8
241 260 277 292 226
167 132 105 77.2 226
18.1 18.6 19 19.4 17.7
231 249 265 279 218
163 129 101 73.6 218
20 20.6 21 21.5 19.6
220 237 253 266 209
158 124 97.2 69.5 209
22 22.7 23.2 23.6 21.7
208 224 239 251 199
153 120 92.8 65.3 199
24.2 24.8 25.4 25.9 23.8
9,000/0.06
62 67 72
267 284 305
260 216 166
12 12.3 12.7
261 277 298
256 213 164
13.6 13.9 14.3
258 273 294
254 211 162
14.5 14.8 15.2
250 265 285
249 208 159
16.2 16.5 17
242 255 274
242 204 155
18.1 18.4 18.9
233 244 263
233 200 152
20.1 20.4 21
223 232 250
223 195 147
22.1 22.5 23.1
212 219 234
212 189 142
24.3 24.6 25.2
Evap Air — Cfm/BF
7,000/0.05
Evap Air — Ewb (F)
58 62 67 72 76
251 256 274 296 312
238 230 191 151 119
11.8 11.8 12.1 12.5 12.8
246 250 268 289 305
234 227 189 149 117
13.3 13.4 13.7 14.1 14.4
243 246 264 285 301
232 225 187 147 115
14.2 14.2 14.6 15 15.3
236 238 256 277 292
227 221 184 144 112
15.9 15.9 16.3 16.8 17.2
228 230 247 267 282
221 217 180 141 109
17.7 17.8 18.2 18.7 19.1
219 220 236 256 270
215 212 176 137 105
19.6 19.7 20.2 20.8 21.2
210 210 225 243 257
207 206 171 132 101
21.7 21.7 22.2 22.9 23.3
199 200 212 230 243
199 199 166 128 96.4
23.8 23.8 24.4 25 25.5
Evap Air — Cfm/BF
Evap Air — Ewb (F)
76 80 54 58
321 338 272 272
126 87 272 271
12.9 13.2 12.1 12.1
315 331 266 267
124 85 266 267
14.6 14.9 13.7 13.7
310 326 263 263
123 83.7 263 263
15.5 15.8 14.6 14.6
301 316 257 256
120 81 257 256
17.4 17.7 16.4 16.4
288 304 248 248
116 77.8 248 248
19.3 19.7 18.3 18.3
275 291 239 239
112 74.2 239 239
21.4 21.8 20.3 20.2
262 276 229 228
108 70.2 229 228
23.5 24 22.3 22.3
247 258 218 217
103 65.4 218 217
25.7 26.2 24.5 24.5
BYPASS
FACTOR
(BF)
.05
.10
.20
.30
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
4. Use chart below for bypass factor.
CFM 54
6,000 0.386
7,000 0.444
8,000 0.492
9,000 0.532
10,000 0.566
242
8,000/0.05
80 54 58 62 67
330 257 259 262 279
87 257 251 246 204
13.1 11.9 11.9 11.9 12.2
323 252 254 256 273
84.9 252 247 243 201
14.8 13.4 13.5 13.5 13.8
318 249 250 252 269
83.6 249 245 241 199
15.7 14.3 14.3 14.4 14.7
310 243 244 245 261
80.9 243 240 236 196
17.6 16 16.1 16.1 16.5
298 235 235 236 251
77.7 235 233 231 192
19.6 17.9 17.9 17.9 18.3
285 226 226 226 241
74 226 226 225 188
21.6 19.9 19.9 19.9 20.3
271 217 217 217 229
70 217 217 217 183
23.8 21.9 21.9 21.9 22.4
255 207 207 206 216
65.7 207 207 206 178
26 24.1 24.1 24.1 24.5
10,000/0.07
62 67 72
272 287 307
271 227 173
12.1 12.4 12.7
267 281 301
267 225 171
13.7 14 14.3
263 277 296
263 223 169
14.6 14.9 15.2
256 268 287
256 220 166
16.4 16.6 17
248 258 276
248 215 162
18.2 18.5 19
239 247 264
239 211 158
20.2 20.5 21
228 235 251
228 206 154
22.3 22.6 23.1
217 222 235
217 200 148
24.5 24.7 25.3
ENTERING AIR DRY-BULB TEMP (F)
79 78 77 76 75
81 82 83 84 85
Correction Factor
1.04 2.07 3.11 4.14 5.18
.98 1.96 2.94 3.92 4.90
.87 1.74 2.62 3.49 4.36
.76 1.53 2.29 3.05 3.82
ENTERING WET-BULB (F)
58 62 67 72
Bypass Factor
0.197 0.108 0.109 0.134
0.260 0.131 0.121 0.138
0.321 0.163 0.133 0.145
0.375 0.205 0.146 0.154
0.420 0.245 0.158 0.164
72 76 80
300 317 333
159 123 86.7
12.6 12.9 13.1
293 310 326
156 120 84.6
14.2 14.5 14.8
290 305 322
155 119 83.5
15.1 15.4 15.8
282 296 314
152 116 81.3
16.9 17.3 17.7
272 285 303
148 112 78
18.9 19.2 19.7
260 273 290
145 108 74.4
20.9 21.3 21.8
248 260 275
140 104 70.4
23 23.4 23.9
232 245 257
135 99.8 65.5
25.1 25.7 26.1
76 80
325 340
130 86.7
13 13.3
317 333
127 84.7
14.6 15
312 327
126 83.4
15.6 15.9
303 317
123 80.7
17.4 17.7
292 306
120 77.6
19.4 19.7
279 291
116 73.9
21.5 21.8
263 276
111 69.9
23.6 24
248 259
106 65.2
25.8 26.2
under 75
over 85
Use formula
shown below.
76 80
0.000 0.000
0.000 0.000
0.000 0.000
0.000 0.000
0.000 0.000