217 performance data (cont) – Bryant 581A/B User Manual
Page 217
217
PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH HOT GAS REHEAT OPTION (cont)
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
t
lwb
= Wet-bulb temperature corresponding to enthalpy of air leaving evapo-
rator coil (h
lwb
)
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).
581A300 (25 TONS) UNIT WITH HOT GAS REHEAT IN COOLING MODE
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
7000/0.042
8250/0.052
9500/0.062
10,750/0.072
12,000/0.082
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
245
268
293
318
259
282
303
333
274
291
314
340
289
301
322
348
305
309
332
356
SHC
245
229
197
162
259
254
213
173
274
271
230
183
289
287
247
195
305
298
267
203
kW
16.4
17.0
17.6
18.2
16.7
17.4
17.9
18.6
17.1
17.6
18.2
18.8
17.5
17.8
18.4
19.0
18.0
18.1
18.6
19.2
85
TC
233
259
278
309
256
273
293
324
271
282
305
330
285
290
312
337
298
303
321
343
SHC
233
228
186
158
256
252
211
171
271
264
229
180
285
276
246
191
298
295
261
201
kW
17.9
18.7
19.3
19.9
18.5
19.1
19.7
20.4
19.0
19.4
20.0
20.8
19.3
19.6
20.2
21.1
19.8
19.9
20.4
21.3
95
TC
230
252
276
303
251
265
284
314
269
274
290
326
274
282
300
332
283
293
308
334
SHC
230
225
191
156
251
249
202
166
269
269
220
181
274
274
238
190
283
280
259
197
kW
20.0
20.8
21.4
22.1
20.7
21.2
21.5
22.4
21.3
21.4
21.9
23.0
21.5
21.7
22.1
23.2
21.6
22.0
22.5
23.3
105
TC
226
245
268
292
242
253
277
301
255
264
284
308
266
275
290
314
278
281
294
319
SHC
226
223
188
153
242
241
205
163
255
255
221
171
265
265
240
185
278
278
253
194
kW
22.0
22.8
23.3
24.3
22.7
23.1
23.7
24.7
23.1
23.4
24.0
25.0
23.6
23.7
24.3
25.2
24.0
24.1
24.4
25.4
115
TC
221
233
258
281
232
242
267
290
247
253
274
297
253
260
275
302
267
269
279
306
SHC
221
217
183
149
232
230
200
160
247
246
217
170
253
254
233
179
267
267
248
189
kW
24.3
25.1
25.7
26.7
24.8
25.4
26.1
27.1
25.3
25.8
26.4
27.2
25.8
26.0
26.5
27.3
26.1
26.3
26.7
27.4
125
TC
216
223
247
268
225
230
253
275
237
240
256
280
247
248
260
285
254
255
263
288
SHC
216
212
181
145
225
223
196
155
237
236
211
163
247
247
228
174
254
254
242
184
kW
26.9
27.1
28.0
29.0
27.4
27.5
28.3
29.4
27.8
27.9
28.5
29.6
28.2
28.3
28.7
29.8
28.5
28.6
28.9
29.9
581A300 (25 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B OFF
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
7500/0.045
8250/0.055
9500/0.065
10,750/0.075
12,000/0.085
Evaporator Air — Relative Humidity (%)
50
55
60
50
55
60
50
55
60
50
55
60
50
55
60
65
TC
79
83
87
80
84
88
81
85
89
82
86
90
83
87
91
SHC
39
33
28
41
35
30
43
37
32
45
39
34
47
41
36
kW
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
75
TC
56
61
65
57
62
66
59
63
67
60
64
68
61
65
69
SHC
18
11
5
20
12
6
22
15
8
24
16
10
26
18
12
kW
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
85
TC
34
38
42
35
39
43
37
41
45
38
42
46
39
43
47
SHC
–2
–11
–19
–1
–10
–18
1
–8
–16
3
–7
–14
4
–5
–13
kW
11
11
12
11
12
12
12
12
12
12
12
12
12
12
12
95
TC
12
16
19
13
17
21
15
19
22
16
20
24
17
22
25
SHC
–23
–33
–42
–22
–32
–41
–20
–31
–40
–19
–30
–39
–17
–28
–38
kW
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
581A300 (25 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B ON
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
7500/0.045
8250/0.055
9500/0.065
10,750/0.075
12,000/0.085
Evaporator Air — Relative Humidity (%)
50
55
60
50
55
60
50
55
60
50
55
60
50
55
60
65
TC
211
222
231
215
226
235
220
232
241
226
237
247
230
242
252
SHC
123
115
109
129
121
115
139
131
124
147
139
133
155
147
140
kW
19
19
20
19
19
20
19
19
20
19
20
20
19
20
20
75
TC
182
193
202
185
196
205
189
200
210
192
204
214
196
208
218
SHC
103
93
85
110
100
91
120
110
101
128
118
110
136
126
118
kW
20
21
21
20
21
21
21
21
21
21
21
21
21
21
21
85
TC
153
164
174
155
166
176
157
169
178
159
171
181
161
173
184
SHC
84
72
62
90
78
68
100
88
78
110
97
87
118
106
95
kW
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
95
TC
124
135
145
125
136
146
125
137
147
126
138
148
127
139
149
SHC
64
50
38
71
57
45
81
67
55
91
76
64
99
85
72
kW
23
23
23
23
23
23
23
23
24
23
23
24
23
24
24
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
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
5
81A1
55-
30
0