Performance data, Cooling capacities, 239 performance data – Bryant 581C User Manual
Page 239: Cooling capacities — standard units
239
PERFORMANCE DATA
COOLING CAPACITIES — STANDARD UNITS
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
tlwb = Wet-bulb temperature corresponding to enthalpy of air leaving evapo-
rator coil (hlwb)
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).
4. Use chart below for bypass factor.
581A155 (12 Tons)
Temp (F)
Air Ent
Cond
Evap Air — Cfm/BF
3600/0.01
4375/0.01
5000/0.01
Evap Air — Ewb (F)
54
58
62
67
72
76
80
54
58
62
67
72
76
80
54
58
62
67
72
76
80
60
TC
152
156
161
174
189
201
213
161
164
167
180
195
207
218
169
171
172
184
199
211
222
SHC
152
144
135
114
92.9
75.4
57.5
161
156
150
125
99.6
78.7
57.5
169
166
162
134
105
81.3
57.4
kW
7.56
7.65
7.74
8.01
8.33
8.6
8.86
7.76
7.82
7.88
8.14
8.46
8.72
8.97
7.92
7.95
7.98
8.24
8.55
8.82
9.06
70
TC
148
152
156
169
183
195
206
157
160
162
174
189
200
211
165
166
167
179
193
204
214
SHC
148
141
133
112
90.6
73.2
55.4
157
153
148
123
97.3
76.5
55.3
165
162
160
132
103
79.1
55.3
kW
8.5
8.58
8.67
8.97
9.26
9.53
9.8
8.7
8.75
8.81
9.07
9.39
9.66
9.91
8.86
8.89
8.91
9.16
9.49
9.76
9.99
75
TC
146
150
154
166
181
192
204
155
158
160
172
186
197
208
163
164
164
176
189
201
212
SHC
146
139
132
111
89.7
72.2
54.6
155
151
146
122
96.2
75.5
54.6
163
161
158
131
101
78.1
54.5
kW
9.02
9.1
9.18
9.45
9.8
10.1
10.4
9.22
9.27
9.31
9.58
9.91
10.2
10.5
9.39
9.41
9.43
9.68
9.99
10.3
10.6
85
TC
142
145
149
161
175
186
196
151
153
154
166
179
190
200
158
159
159
170
183
194
203
SHC
142
136
129
109
87.4
70
52.4
151
147
144
119
93.9
73.2
52.3
158
157
155
128
99.1
75.8
52.2
kW
10.1
10.2
10.3
10.6
10.9
11.2
11.5
10.3
10.4
10.4
10.7
11
11.3
11.6
10.5
10.5
10.5
10.8
11.1
11.4
11.7
95
TC
138
141
143
155
168
179
189
147
148
149
160
173
183
192
153
153
154
164
177
187
195
SHC
138
133
127
106
85
67.7
50.1
147
144
141
117
91.6
70.9
50
153
153
152
126
96.9
73.5
49.9
kW
11.4
11.4
11.5
11.8
12.2
12.4
12.7
11.6
11.6
11.6
11.9
12.3
12.6
12.8
11.8
11.8
11.8
12
12.4
12.7
12.9
105
TC
134
136
138
149
162
172
181
141
142
143
153
166
176
184
148
148
148
157
169
179
186
SHC
134
129
124
104
82.4
65.3
47.7
141
139
137
114
89
68.4
47.5
148
148
148
123
94.3
70.9
47.4
kW
12.7
12.8
12.8
13.2
13.5
13.8
14.1
12.9
13
13
13.3
13.6
13.9
14.2
13.1
13.1
13.1
13.4
13.7
14
14.3
115
TC
129
130
132
143
155
164
172
136
137
138
146
158
168
175
142
142
142
149
161
171
177
SHC
129
125
121
101
79.8
62.7
45.1
136
135
133
111
86.3
65.9
45
142
142
142
120
91.6
68.4
45
kW
14.2
14.2
14.3
14.6
15
15.3
15.6
14.4
14.4
14.5
14.7
15.1
15.5
15.7
14.6
14.6
14.6
14.8
15.2
15.6
15.7
125
TC
124
125
126
136
147
156
163
131
131
132
140
150
159
165
136
136
136
142
153
162
167
SHC
124
121
118
98.2
77
60.1
42.5
131
130
128
109
83.5
63.2
42.5
136
136
136
117
88.7
65.7
42.4
kW
15.8
15.8
15.9
16.2
16.6
17
17.2
16.1
16.1
16.1
16.4
16.7
17.1
17.3
16.3
16.2
16.2
16.4
16.8
17.2
17.4
581A155 (12 Tons) (cont)
Temp (F)
Air Ent
Cond
Evap Air — Cfm/BF
5625/0.02
6250/0.02
Evap Air — Ewb (F)
54
58
62
67
72
76
80
54
58
62
67
72
76
80
60
TC
175
175
176
187
202
214
224
180
180
180
190
204
216
226
SHC
175
173
171
142
110
83.8
57.3
180
180
180
151
115
86.2
57.2
kW
8.03
8.05
8.07
8.3
8.61
8.87
9.1
8.14
8.15
8.16
8.36
8.66
8.93
9.14
70
TC
170
171
171
181
195
207
216
175
176
176
184
198
209
218
SHC
170
169
168
140
108
81.5
55.2
175
176
176
148
113
84
55.1
kW
8.98
8.99
9.01
9.23
9.55
9.81
10
9.09
9.1
9.11
9.3
9.61
9.87
10.1
75
TC
168
168
169
179
192
203
213
173
173
173
181
195
206
215
SHC
168
167
166
139
107
80.5
54.4
173
173
173
147
112
83
54.3
kW
9.5
9.51
9.52
9.75
10.1
10.3
10.6
9.62
9.62
9.62
9.81
10.1
10.4
10.6
85
TC
163
163
164
172
185
196
205
168
168
168
175
188
198
206
SHC
163
162
162
136
104
78.2
52.2
168
168
168
145
109
80.6
52.1
kW
10.6
10.6
10.6
10.9
11.2
11.5
11.7
10.7
10.7
10.8
10.9
11.2
11.5
11.8
95
TC
158
158
158
166
178
189
196
162
162
162
168
180
190
197
SHC
158
157
157
134
102
75.9
49.8
162
162
162
142
107
78.3
49.7
kW
11.9
11.9
11.9
12.1
12.4
12.7
12.9
12
12
12
12.1
12.5
12.8
13
105
TC
152
152
152
159
171
181
187
157
157
157
161
173
182
188
SHC
152
152
152
131
99.3
73.3
47.4
157
157
157
139
104
75.7
47.4
kW
13.2
13.2
13.2
13.4
13.8
14.1
14.3
13.4
13.4
13.4
13.5
13.9
14.2
14.4
115
TC
146
146
146
151
163
172
177
150
150
150
153
165
174
178
SHC
146
146
146
128
96.6
70.7
44.9
150
150
150
136
102
73.1
44.8
kW
14.7
14.7
14.7
14.9
15.3
15.6
15.8
14.9
14.9
14.9
14.9
15.4
15.7
15.8
125
TC
140
140
140
144
155
163
167
144
144
144
146
156
164
168
SHC
140
140
140
125
93.7
67.9
42.4
144
144
144
133
98.7
70.2
42.3
kW
16.4
16.4
16.4
16.5
16.9
17.2
17.4
16.5
16.5
16.5
16.6
17
17.3
17.4
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
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
CFM
ENTERING WET-BULB (F)
54
58
62
67
72
76
80
Bypass Factor
3600
0.355
0.158
0.054
0.038
0.049
0.000
0.000
4375
0.439
0.255
0.112
0.043
0.057
0.000
0.000
5000
0.486
0.314
0.126
0.054
0.037
0.000
0.000
5625
0.525
0.360
0.174
0.066
0.073
0.000
0.000
6250
0.551
0.410
0.202
0.080
0.079
0.000
0.000
58
1A15
5, 1
8
0