Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual
Page 23
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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).
581B060 (5 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
1500/0.08
1750/0.09
2000/0.11
2500/0.13
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
69.9
62.7
56.2
74.7
67.3
61.0
78.5
71.2
64.8
81.7
75.5
69.3
SHC
29.0
36.9
43.9
31.7
40.5
51.2
34.5
44.2
55.4
37.8
52.0
62.8
kW
3.61
3.55
3.51
3.64
3.58
3.49
3.65
3.60
3.51
3.62
3.58
3.51
85
TC
65.9
59.1
51.7
70.6
63.2
56.3
75.5
66.8
60.7
78.1
70.8
65.1
SHC
25.3
34.0
41.9
27.5
37.6
48.0
30.7
41.6
52.0
33.8
47.4
58.0
kW
4.05
3.97
3.91
4.07
4.01
3.92
4.11
4.00
3.95
4.08
4.02
3.96
95
TC
61.9
55.2
47.7
66.5
58.8
51.3
70.4
61.9
55.7
74.2 65.9
60.6
SHC
21.6
31.1
40.0
23.5
34.5
44.6
26.0
38.6
47.9
30.0
42.8
52.6
kW
4.53
4.43
4.35
4.55
4.47
4.37
4.56
4.42
4.41
4.58
4.49
4.44
105
TC
57.7
51.1
44.9
61.8
54.5
47.7
65.1
57.2
50.8
68.4
60.3
56.1
SHC
18.1
27.8
35.7
20.0
31.2
40.1
22.1
34.3
43.5
26.1
38.9
48.5
kW
5.05
4.93
4.84
5.09
4.97
4.88
5.11
4.96
4.92
5.11
5.03
4.98
115
TC
53.4
47.2
42.0
56.6
50.0
44.2
59.6
52.5
46.2
62.6
54.9
51.6
SHC
14.7
24.6
31.5
16.5
27.8
35.7
18.2
30.0
39.0
22.1
34.9
44.3
kW
5.60
5.49
5.40
5.64
5.52
5.45
5.69
5.55
5.48
5.69
5.61
5.57
125
TC
48.7
42.0
36.9
51.3
45.0
39.0
54.1
46.8
40.9
56.9
49.2
45.9
SHC
10.9
19.6
28.0
12.5
22.2
31.5
13.5
24.0
34.0
16.5
28.0
38.8
kW
6.26
6.12
6.02
6.28
6.18
6.09
6.33
6.18
6.13
6.33
6.27
6.22
581B072 (6 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
1800/0.05
2100/0.06
2400/0.06
3000/0.08
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
82.6
75.6
68.5
84.9
78.0
70.9
85.9
79.5
73.5
89.1
82.7
77.0
SHC
36.0
44.8
55.4
37.5
49.1
59.7
38.8
51.1
64.0
41.8
58.1
70.2
kW
4.60
4.52
4.36
4.67
4.57
4.46
4.70
4.57
4.45
4.77
4.61
4.51
85
TC
78.2
71.6
64.5
80.9
73.4
65.8
82.0
74.4
67.9
85.8
78.2
72.3
SHC
31.4
41.2
51.7
33.0
44.7
55.8
34.7
47.4
60.1
37.6
54.3
66.7
kW
5.16
5.03
4.89
5.22
5.11
4.96
5.26
5.09
4.97
5.32
5.17
5.04
95
TC
73.8
67.4
60.2
76.3
68.3
60.5
77.5
69.3
62.3
82.0
72.8
67.5
SHC
27.0
37.6
47.9
28.2
40.0
51.6
30.2
43.7
56.2
33.6
49.2
62.9
kW
5.75
5.60
5.44
5.80
5.66
5.48
5.84
5.68
5.53
5.90
5.73
5.60
105
TC
68.4
62.6
55.9
71.4
64.3
56.2
72.1
64.6
58.3
75.7
67.0
62.4
SHC
22.3
33.5
43.5
23.4
36.5
48.0
25.4
38.4
50.2
29.1
45.2
56.2
kW
6.37
6.22
6.06
6.45
6.27
6.10
6.46
6.29
6.16
6.53
6.36
6.24
115
TC
63.4
57.8
50.7
66.0
60.1
51.5
66.4
59.6
54.5
68.8
60.8
57.5
SHC
18.1
29.5
38.9
18.8
32.9
44.1
20.7
33.3
43.8
24.3
41.4
49.7
kW
7.04
6.89
6.68
7.10
6.91
6.74
7.12
6.95
6.83
7.16
7.01
6.92
125
TC
55.5
49.6
45.8
58.4
52.4
46.1
57.6
52.1
49.5
59.2
52.8
53.1
SHC
15.3
24.0
35.2
15.7
27.5
39.0
17.5
27.5
38.4
20.9
34.6
44.4
kW
7.80
7.61
7.38
7.83
7.67
7.49
7.89
7.72
7.58
7.92
7.78
7.70
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