Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual
Page 25
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PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH PERFECT HUMIDITY™ OPTION (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 evapo-
rator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
581B120 (10 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
3000/0.03
3200/0.03
4000/0.04
5000/0.04
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
134.3
122.5
111.4
135.8
124.3
113.0
138.4
129.5
123.5
143.3
136.5
130.2
SHC
60.0
76.1
93.7
61.3
79.1
97.4
68.0
89.5
109.4
75.2
100.9
123.3
kW
7.03
6.84
6.72
7.01
6.89
6.77
7.10
6.92
6.77
7.15
7.03
6.88
85
TC
127.6
115.4
104.6
128.9
118.1
107.0
132.5
121.5
116.6
137.2
128.0
122.9
SHC
51.5
68.8
87.2
53.9
72.0
91.2
61.0
82.7
102.4
68.6
93.6
115.9
kW
7.96
7.86
7.59
7.94
7.78
7.51
8.02
7.84
7.69
8.02
7.94
7.79
95
TC
120.9
108.3
97.8
121.9
111.8
101.0
126.5
113.4
109.7
131.1
119.4
115.5
SHC
43.0
61.5
80.6
46.5
64.8
84.9
53.9
75.9
95.4
62.0
86.2
108.4
kW
8.88
8.87
8.46
8.86
8.66
8.26
8.94
8.76
8.60
8.89
8.85
8.69
105
TC
112.0
99.9
90.4
113.1
103.2
93.4
117.2
105.0
100.7
122.1
110.5
105.9
SHC
36.1
54.1
73.8
38.8
57.8
78.9
45.6
68.2
86.8
53.0 78.3
99.7
kW
10.0
10.0
9.6
10.0
9.8
9.5
10.1
9.9
9.8
10.1
10.0
9.9
115
TC
103.0
91.5
83.1
104.3
94.6
85.9
107.8
96.7
91.7
113.0
101.6
96.4
SHC
29.2
46.7
66.9
31.2
50.7
72.9
37.3
60.6
78.3
44.0
70.3
90.9
kW
11.2
11.1
10.8
11.2
11.0
10.7
11.3
11.1
11.0
11.3
11.2
11.1
125
TC
94.1
83.1
75.7
95.5
86.0
78.3
98.5
88.3
82.7
104.0
92.7
86.8
SHC
22.3
39.3
60.1
23.5
43.7
66.8
29.0
52.9
69.7
35.0
62.4
82.2
kW
12.35
12.15
11.94
12.38
12.13
11.92
12.48
12.27
12.25
12.53
12.30
12.28
581B150 (12
1
/
2
TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
3750/0.08
4300/0.09
5000/0.11
6250/0.13
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
156.3
144.2
132.3
160.0
148.4
136.2
162.8
150.6
138.2
169.0
157.5
145.6
SHC
66.6
87.6
112.1
72.5
94.8
121.3
76.9
99.6
127.5
87.0
115.5
142.7
kW
9.28
8.98
8.59
9.35
9.08
8.80
9.40
9.18
8.9
9.43 9.18
8.93
85
TC
147.6
136.2
123.7
150.7
140.1
127.2
154.1
140.8
127.9
161.1
148.0
135.4
SHC
58.7
80.0
103.8
63.5
86.5
112.2
68.7
91.0
118.1
77.7
107.8
133.2
kW
10.29
9.93
9.58
10.36
10.08
9.77
10.40
10.34
10.03
10.45
10.18
9.88
95
TC
138.9
128.2
115.1
141.4
131.8
118.3
145.3
131.0
117.6
153.1
138.4
125.1
SHC
50.8
72.3
95.5
54.4
78.1
103.2
60.5
82.3
108.7
68.5
100.0
123.7
kW
11.29
10.87
10.57
11.37
11.08
10.74
11.40
11.50
11.1
11.46
11.17
10.83
105
TC
129.1
117.8
105.8
131.7
121.0
108.7
134.8
119.9
107.7
140.9
126.9
115.9
SHC
42.1
63.5
86.5
45.4
69.0
93.9
51.2
74.2
101.3
57.7
90.2
113.6
kW
12.59
12.14
11.82
12.67
12.34
11.96
12.70
12.67
12.28
12.79
12.46
12.08
115
TC
119.2
107.3
96.4
122.1
110.2
99.0
124.2
108.8
97.8
128.7
115.3
106.7
SHC
33.5
54.8
77.5
36.4
59.8
84.7
41.9
66.1
93.8
46.8
80.5
103.5
kW
13.90
13.40
13.08
13.98
13.59
13.18
14.00
13.83
13.41
14.11
13.75
13.33
125
TC
109.4
96.9
87.1
112.4
99.4
89.3
113.7
97.7
87.8
116.5
103.8
97.5
SHC
24.8
46.0
68.5
27.4
50.7
75.5
32.6
58.0
86.4
36.0
70.7
93.5
kW
15.20
14.67
14.33
15.28
14.85
14.40
15.30
15.00
14.54
15.44
15.04
14.58
BF
— Bypass Factor
Edb
— Entering Dry Bulb
Ewb — Entering Wet Bulb
kW
— Compressor Motor Power Input
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