216 performance data (cont) – Bryant 581A/B User Manual
Page 216
216
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).
581A240 (20 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B AND C OFF
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
6000/0.04
7000/0.05
8000/0.06
9000/0.07
10,000/0.08
Evaporator Air — Relative Humidity (%)
50
55
60
50
55
60
50
55
60
50
55
60
50
55
60
65
TC
73
75
77
73
76
78
74
76
79
75
77
79
75
78
80
SHC
45
42
40
47
44
42
49
47
44
51
48
46
53
50
48
kW
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
75
TC
55
57
59
56
58
60
56
58
60
57
59
61
57
59
61
SHC
29
25
22
31
27
24
33
30
26
35
31
28
37
33
30
kW
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
85
TC
38
40
41
38
40
42
39
40
42
39
41
42
39
41
43
SHC
13
8
4
15
10
7
17
13
9
19
14
10
21
16
12
kW
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
95
TC
20
22
23
21
22
24
21
22
24
21
23
24
21
23
24
SHC
–4
–9
–14
–1
–7
–11
1
–4
–9
3
–3
–7
5
–1
–6
kW
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
581A240 (20 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, C OFF
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
6000/0.04
7000/0.05
8000/0.06
9000/0.07
10,000/0.08
Evaporator Air — Relative Humidity (%)
50
55
60
50
55
60
50
55
60
50
55
60
50
55
60
65
TC
106
110
113
108
111
114
109
113
116
110
114
117
111
115
118
SHC
45
42
39
47
44
41
49
46
44
51
48
46
53
50
47
kW
10.7
10.7
10.8
10.7
10.7
10.8
10.7
10.7
10.8
10.7
10.7
10.8
10.7
10.7
10.8
75
TC
81
84
87
82
85
88
83
86
89
83
87
89
84
87
90
SHC
29
25
21
31
27
24
34
29
26
36
31
28
37
33
30
kW
11.6
11.6
11.6
11.6
11.6
11.6
11.6
11.6
11.6
11.6
11.6
11.6
11.6
11.6
11.6
85
TC
56
58
61
56
59
61
56
59
61
57
59
62
57
60
62
SHC
13
8
3
16
10
6
18
13
8
20
15
10
22
16
12
kW
12.6
12.7
12.7
12.6
12.7
12.7
12.6
12.7
12.7
12.6
12.7
12.7
12.6
12.7
12.7
95
TC
30
33
34
30
32
34
30
32
34
30
32
34
30
32
34
SHC
–3
–9
–14
0
–6
–12
2
–4
–10
4
–2
–8
6
0
–6
kW
13.6
13.6
13.6
13.6
13.6
13.6
13.6
13.6
13.6
13.6
13.6
13.6
13.6
13.6
13.6
581A240 (20 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, C ON
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
6000/0.04
7000/0.05
8000/0.06
9000/0.07
10,000/0.08
Evaporator Air — Relative Humidity (%)
50
55
60
50
55
60
50
55
60
50
55
60
50
55
60
65
TC
177
185
191
177
185
192
178
186
192
178
186
193
178
186
193
SHC
98
92
86
100
94
88
101
95
90
103
97
92
104
98
93
kW
14.5
14.6
14.7
14.5
14.6
14.7
14.5
14.6
14.7
14.5
14.6
14.7
14.5
14.6
14.7
75
TC
154
161
168
154
162
169
155
162
169
155
163
169
155
163
170
SHC
81
73
66
83
75
69
85
78
71
87
80
73
89
81
75
kW
16.1
16.1
16.1
16.1
16.1
16.1
16.1
16.1
16.1
16.1
16.1
16.1
16.1
16.1
16.1
85
TC
131
138
145
131
139
145
131
139
146
132
139
146
132
140
146
SHC
63
54
46
66
57
49
69
60
52
71
62
54
73
64
56
kW
17.7
17.7
17.8
17.7
17.7
17.8
17.7
17.7
17.8
17.7
17.7
17.8
17.7
17.7
17.8
95
TC
107
115
122
108
115
122
108
116
122
108
116
123
109
116
123
SHC
46
35
25
50
39
29
53
42
32
55
45
35
58
47
38
kW
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
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
581
A155
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00