141 performance data (cont) – Bryant DURAPAC 551B User Manual
Page 141
141
PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
COOLING CAPACITIES LEGEND AND NOTES
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
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).
558F300 (25 TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
7,000/0.05
8,000/0.06
9,000/0.07
10,000/0.08
11,250/0.09
Air Entering Evaporator — Ewb (F)
57
62
67
72
57
62
67
72
57
62
67
72
57
62
67
72
57
62
67
72
75
TC
256
271
299
327
267
278
305
336
276
283
309
341
285
286
313
344
294
294
316
347
SHC
256
232
196
159
267
249
208
166
276
265
220
173
285
281
232
182
294
294
252
198
kW
18.0
18.3
18.9
19.6
18.3
18.5
19.1
19.8
18.5
18.7
19.2
19.9
18.7
18.8
19.4
20.1
19.0
19.0
19.5
20.2
85
TC
248
262
288
316
259
267
293
322
267
273
298
328
276
276
302
331
284
285
305
336
SHC
248
228
192
154
259
244
204
161
267
259
216
169
276
274
228
175
284
284
244
187
kW
20.0
20.4
20.9
21.5
20.3
20.4
21
21.7
20.6
20.6
21.2
21.9
20.8
20.8
21.3
22
21
21
21.5
22.1
95
TC
241
252
277
303
251
257
281
309
259
262
286
314
266
267
290
317
274
275
293
321
SHC
241
223
187
149
251
239
198
157
259
254
210
164
266
265
222
171
274
275
238
180
kW
22.4
22.6
23.1
23.7
22.6
22.7
23.3
23.9
22.8
22.9
23.4
24
23
23
23.5
24.2
23.2
23.2
23.6
24.2
105
TC
233
243
266
289
242
247
270
295
250
252
273
299
256
258
277
303
264
265
280
306
SHC
233
218
182
145
242
233
194
152
250
248
206
159
256
257
217
166
264
265
232
176
kW
24.9
25.1
25.6
26.2
25.2
25.3
25.8
26.3
25.4
25.4
25.9
26.5
25.6
25.6
26
26.6
25.8
25.8
26.1
26.7
115
TC
225
232
254
277
234
236
258
281
241
242
261
285
247
247
264
288
254
255
267
291
SHC
225
214
178
140
234
228
189
148
241
241
201
155
247
247
211
162
253
255
227
171
kW
27.9
27.9
28.5
29
28
28.1
28.6
29.2
28.2
28.2
28.7
29.2
28.4
28.4
28.8
29.3
28.7
28.7
28.9
29.5
125
TC
216
221
241
263
224
225
245
267
231
231
248
269
237
236
251
273
243
242
253
276
SHC
216
208
173
136
223
221
184
142
230
231
196
149
236
236
206
157
243
242
221
166
kW
30.9
31.1
31.6
32
31.2
31.2
31.7
32.2
31.4
31.4
31.7
32.3
31.6
31.6
31.9
32.3
31.7
31.7
31.9
32.5
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
tldb = tedb
–
sensible capacity (Btuh)
1.10 x cfm
tlwb =
Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (h
lwb
)
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
0
T
F
Q
0
04
-0
12
55
8F1
80-
30
0