213 performance data (cont) – Bryant 581A/B User Manual
Page 213
213
PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH HOT GAS REHEAT OPTION
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).
581A181 (15 TONS) UNIT WITH HOT GAS REHEAT IN COOLING MODE
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
4500/0.02
5250/0.03
6000/0.04
6750/0.04
7500/0.05
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
166
179
193
214
175
186
202
221
183
191
208
227
190
195
212
232
197
199
216
236
SHC
165
152
129
108
175
166
140
115
183
178
150
121
190
189
159
127
197
196
168
133
kW
10.4
10.6
10.7
10.9
10.5
10.6
10.8
11.0
10.6
10.7
10.9
11.1
10.7
10.7
10.9
11.2
10.8
10.8
11.0
11.2
85
TC
162
174
189
209
171
180
195
216
179
185
200
222
186
189
205
226
192
194
208
230
SHC
162
150
127
106
171
163
137
113
179
175
147
119
186
185
156
125
192
192
164
131
kW
11.7
11.9
12.1
12.3
11.8
12.0
12.1
12.4
11.9
12.0
12.2
12.5
12.0
12.1
12.3
12.5
12.1
12.1
12.3
12.6
95
TC
158
169
182
202
166
174
187
209
174
179
194
214
181
183
198
218
187
188
201
221
SHC
158
148
126
104
166
160
134
110
174
172
145
116
181
180
154
122
187
187
163
128
kW
12.7
12.9
13.1
13.3
12.9
13.0
13.2
13.4
13.0
13.0
13.2
13.5
13.1
13.1
13.3
13.6
13.1
13.2
13.4
13.6
105
TC
153
163
178
195
162
168
181
201
169
172
188
206
175
177
191
209
181
181
194
213
SHC
153
145
123
101
162
157
133
107
169
167
142
113
175
175
151
119
181
181
160
125
kW
14.1
14.2
14.4
14.7
14.2
14.3
14.5
14.8
14.3
14.3
14.6
14.8
14.4
14.4
14.6
14.9
14.5
14.5
14.7
14.9
115
TC
148
156
171
188
157
161
176
193
163
165
180
197
169
170
183
201
174
175
185
203
SHC
148
141
120
98
157
153
130
104
163
162
139
110
169
169
148
116
174
174
156
122
kW
15.5
15.6
15.8
16.1
15.6
15.7
15.9
16.2
15.7
15.8
16.0
16.3
15.8
15.8
16.1
16.3
15.9
15.9
16.1
16.4
125
TC
143
149
163
179
151
153
168
184
157
158
171
188
163
163
174
190
167
167
176
192
SHC
143
138
117
95
151
149
126
101
157
156
136
107
163
163
144
112
167
167
153
118
kW
17.0
17.1
17.4
17.7
17.2
17.2
17.5
17.8
17.3
17.3
17.6
17.8
17.4
17.4
17.6
17.9
17.5
17.5
17.6
17.9
581A181 (15 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B AND C OFF
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
4500/0.12
5250/0.14
6000/.015
6750/0.18
7500/0.18
Evaporator Air — Relative Humidity (%)
50
55
60
50
55
60
50
55
60
50
55
60
50
55
60
65
TC
55
57
59
56
58
59
56
58
60
57
59
60
57
59
61
SHC
34
32
30
36
34
32
37
35
33
38
36
35
40
38
36
kW
4.4
4.5
4.5
4.4
4.5
4.5
4.4
4.5
4.5
4.4
4.5
4.5
4.4
4.5
4.5
75
TC
42
44
45
43
44
46
43
45
46
43
45
46
44
45
47
SHC
22
19
17
23
21
18
25
22
20
26
24
21
28
25
23
kW
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
85
TC
29
30
31
29
31
32
30
31
32
30
32
33
31
32
33
SHC
9
6
3
11
8
5
13
10
7
14
11
8
16
12
9
kW
5.2
5.2
5.3
5.2
5.2
5.3
5.2
5.2
5.3
5.2
5.2
5.3
5.2
5.2
5.3
95
TC
15
16
17
16
17
18
16
18
18
17
18
19
17
18
19
SHC
–3
–7
–11
–1
–5
–9
1
–3
–7
2
–2
–5
4
0
–4
kW
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
581A181 (15 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, C OFF
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
4500/0.12
5250/0.14
6000/.015
6750/0.18
7500/0.18
Evaporator Air — Relative Humidity (%)
50
55
60
50
55
60
50
55
60
50
55
60
50
55
60
65
TC
81
84
86
82
85
87
83
86
88
84
87
89
85
87
90
SHC
34
32
30
36
33
31
37
35
33
39
36
34
40
38
36
kW
7.8
7.9
7.9
7.8
7.9
7.9
7.8
7.9
7.9
7.8
7.9
7.9
7.8
7.9
7.9
75
TC
62
64
66
62
65
67
63
66
68
64
66
68
64
67
69
SHC
22
19
16
24
21
18
25
22
20
27
24
21
28
25
22
kW
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
85
TC
42
44
46
43
45
46
43
45
47
44
46
48
44
46
48
SHC
10
6
2
12
8
4
14
10
6
15
11
8
16
13
9
kW
9.2
9.2
9.3
9.2
9.2
9.3
9.2
9.2
9.3
9.2
9.2
9.3
9.2
9.2
9.3
95
TC
23
24
26
23
25
26
24
25
27
24
26
27
24
26
27
SHC
–2
–7
–11
0
–5
–9
2
–3
–7
3
–1
–6
5
0
–4
kW
9.9
9.9
9.9
9.9
9.9
9.9
9.9
9.9
9.9
9.9
9.9
9.9
9.9
9.9
9.9
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 for-
mula
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