120 performance data (cont), Cooling capacities (cont) – Bryant DURAPAC 551B User Manual
Page 120
120
PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
LEGEND
NOTES:
1.
Direct interpolation is permissible. Do not extrapolate.
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.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
LEGEND
NOTES:
1.
Direct interpolation is permissible. Do not extrapolate.
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.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
559F240 (20 TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
6,000/0.075
7,000/0.085
8,000/0.100
9,000/0.110
10,000/0.120
Evaporator Air — Ewb (F)
57
62
67
72
57
62
67
72
57
62
67
72
57
62
67
72
57
62
67
72
75
TC
209
222
246
270
219
228
251
277
227
231
256
282
234
235
259
286
240
240
262
289
SHC
209
190
160
130
219
205
171
136
227
219
182
143
234
231
193
149
240
240
203
156
kW
15.7
16.0
16.6
17.2
15.9
16.2
16.8
17.4
16.2
16.3
16.9
17.6
16.4
16.5
17.1
17.7
16.6
16.7
17.2
17.8
85
TC
203
214
237
261
212
220
242
267
220
224
246
272
227
227
250
276
233
233
252
279
SHC
203
186
157
126
212
201
168
133
220
215
179
140
227
226
189
147
233
233
200
153
kW
17.0
17.3
17.9
18.5
17.3
17.5
18.1
18.7
17.5
17.6
18.2
18.9
17.7
17.8
18.4
19.0
17.9
18.0
18.5
19.2
95
TC
197
207
228
252
206
211
233
257
213
215
237
261
220
220
239
265
225
225
241
267
SHC
197
182
153
123
206
196
164
130
213
210
175
136
220
219
185
143
225
225
195
149
kW
18.5
18.7
19.3
19.8
18.8
18.9
19.4
20.1
19.0
19.0
19.6
20.2
19.2
19.2
19.8
20.4
19.4
19.4
19.8
20.5
105
TC
190
197
218
241
198
202
222
246
206
205
226
250
212
212
228
254
217
216
230
255
SHC
190
178
149
119
198
192
160
126
206
204
171
133
212
211
181
139
217
216
191
145
kW
20.1
20.1
20.6
21.3
20.3
20.2
20.8
21.5
20.5
20.4
21.0
21.7
20.7
20.7
21.1
21.8
20.9
20.9
21.3
21.9
115
TC
183
188
207
228
191
192
211
233
198
197
215
237
203
203
217
240
208
207
218
242
SHC
183
173
145
117
191
187
156
122
198
197
166
128
203
203
177
135
208
207
186
141
kW
21.8
21.7
22.1
22.8
22.0
21.9
22.3
22.9
22.2
22.0
22.4
23.1
22.4
22.2
22.6
23.2
22.5
22.4
22.6
23.3
125
TC
175
178
196
217
183
182
200
221
189
188
202
224
194
194
204
226
199
198
206
227
SHC
175
168
141
111
183
181
152
117
189
188
162
125
194
194
172
130
199
198
181
137
kW
23.6
23.2
23.7
24.3
23.8
23.4
23.8
24.4
23.9
23.6
23.9
24.6
24.1
23.8
24.1
24.7
24.2
23.9
24.2
24.8
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
lwb
)
h
lwb
= h
ewb
–
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
559F300 (25 TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
7,000/0.05
8,000/0.06
9,000/0.07
10,000/0.08
11,250/0.09
Evaporator Air — 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
298
328
266
277
304
334
275
281
308
339
283
286
312
342
292
293
316
346
SHC
255
232
195
158
266
250
208
167
275
265
223
177
283
279
235
184
292
291
249
197
kW
19.1
19.5
20.4
21.2
19.5
19.7
20.6
21.4
19.8
19.9
20.7
21.6
20.0
20.2
20.9
21.8
20.3
20.4
21.0
21.9
85
TC
248
262
287
317
259
267
294
324
268
272
298
330
275
278
303
334
283
284
306
337
SHC
248
227
191
155
259
244
203
162
268
259
216
170
275
271
226
177
283
283
243
189
kW
21.0
21.4
22.2
23.1
21.4
21.6
22.4
23.3
21.7
21.8
22.6
23.5
22.0
22.0
22.8
23.7
22.3
22.3
22.9
23.9
95
TC
242
252
277
306
251
258
283
312
260
261
288
317
267
267
291
321
275
274
294
326
SHC
242
223
187
150
251
240
199
158
260
254
210
165
267
263
222
172
275
274
236
181
kW
23.0
23.3
24.1
25.1
23.4
23.6
24.4
25.3
23.7
23.8
24.5
25.5
24.0
24.0
24.7
25.7
24.3
24.3
24.9
25.8
105
TC
234
241
266
293
243
247
272
299
251
252
275
302
258
257
279
307
265
264
282
311
SHC
234
218
182
146
243
233
195
153
251
246
205
161
258
255
217
167
265
264
230
175
kW
25.1
25.3
26.1
27.0
25.5
25.6
26.4
27.4
25.8
25.8
26.5
27.5
26.1
26.1
26.7
27.7
26.4
26.3
26.9
27.9
115
TC
226
231
254
279
235
236
259
284
242
241
261
288
248
247
264
291
255
253
267
294
SHC
226
212
178
141
235
228
189
148
242
238
201
156
248
247
211
162
255
253
225
170
kW
27.4
27.4
28.3
29.1
27.7
27.7
28.5
29.3
28.0
27.9
28.6
29.5
28.2
28.2
28.8
29.7
28.6
28.4
29.0
29.9
121
TC
221
224
246
—
229
229
251
—
236
235
253
—
242
240
256
—
249
246
258
—
SHC
221
209
175
—
229
223
186
—
236
233
197
—
242
240
208
—
249
246
221
—
kW
28.7
28.7
29.6
—
29.1
29.0
29.8
—
29.3
29.2
29.9
—
29.6
29.5
30.1
—
29.9
29.7
30.2
—
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
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
lwb
)
h
lwb
= h
ewb
–
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
9F1
80-
30
0