Bryant 581C Manual De Usuario
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:
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.
Above 80 F edb, add (corr factor x cfm) to SHC.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
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
leaving evaporator coil (h
lwb
)
h
lwb
=
h
ewb
–
total capacity (Btuh)
4.5 x cfm
BYPASS
FACTOR
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
579
F18
0
-300