Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual
Page 24
24
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).
581B090 (7
1
/
2
TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
2250/0.10
3000/0.11
3750/0.14
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
75
TC
98.4
91.1
81.1
103.7
97.9
91.8
105.8
101.3
94.1
SHC
44.5
55.4
67.0
50.4
65.4
80.5
54.5
72.4
89.5
kW
5.05
4.96
4.87
5.09
5.04
4.97
5.16
5.04
4.99
85
TC
94.2
85.8
76.9
100.3
92.4
85.2
103.5
96.8
89.0
SHC
39.7
51.3
62.7
46.2
58.3
75.7
50.6
68.2
84.3
kW
5.74
5.65
5.55
5.81
5.75
5.64
5.89
5.74
5.70
95
TC
89.9
80.5
72.6
96.9
86.8
78.6
101.1
92.2
83.8
SHC
34.8
47.2
58.3
41.9
51.2
71.0
46.6
63.9
79.1
kW
6.42
6.33
6.22
6.52
6.45
6.31
6.62
6.43
6.40
105
TC
84.6
75.3
68.0
91.6
81.3
73.4
94.5
86.3
78.4
SHC
30.0
42.5
53.9
36.9
49.3
66.4
41.4
59.2
73.8
kW
7.26
7.16
7.05
7.36
7.25
7.15
7.46
7.29
7.23
115
TC
79.2
70.1
63.3
86.2
75.8
68.1
87.9
80.3
72.9
SHC
25.2
37.8
49.4
31.9
47.4
61.9
36.1
54.4
68.5
kW
8.10
7.99
7.87
8.20
8.05
7.98
8.30
8.14
8.05
125
TC
72.8
64.5
57.2
78.0
69.8
62.3
81.6
73.2
69.2
SHC
20.1
33.4
44.1
25.4
42.5
56.5
31.1
48.9
64.7
kW
9.10
8.94
8.83
9.23
9.05
8.95
9.26
9.10
8.99
581B102 (8
1
/
2
TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
2550/0.08
3000/0.09
3400/0.11
4250/0.13
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
112.4
102.2
92.6
115.2
106.4
96.4
119.6
110.3
101.3
127.6
117.6
108.0
SHC
49.1
62.4
75.0
52.9
68.5
82.3
56.2
73.3
89.5
62.8
83.3
101.7
kW
6.10
5.96
5.86
6.18
6.05
5.95
6.18
6.05
5.95
6.18
6.10
6.00
85
TC
105.7
95.7
86.5
110.0
100.6
91.0
114.0
103.7
94.6
118.2
110.9
101.2
SHC
43.6
57.1
69.9
47.8
62.8
76.9
50.7
67.9
82.8
74.7
77.7
94.8
kW
6.92
6.78
6.63
6.97
6.90
6.75
7.01
6.85
6.75
7.01
6.91
6.80
95
TC
98.9
89.1
80.4
104.7
94.8
85.5
108.4
97.0
87.9
108.8
104.1
94.3
SHC
38.0
51.7
64.8
42.7
57.0
71.4
45.2
62.4
76.2
86.5
72.0
87.9
kW
7.73
7.59
7.40
7.75
7.75
7.56
7.84
7.65
7.54
7.84
7.71
7.60
105
TC
91.8
82.3
73.8
97.3
87.6
78.6
100.4
89.8
80.8
102.3
95.3
85.8
SHC
32.6
46.3
59.5
37.0
51.9
66.8
39.3
56.7
70.0
68.6
65.5
80.9
kW
8.80
8.64
8.47
8.80
8.76
8.58
8.89
8.69
8.59
8.93
8.77
8.67
115
TC
84.7
75.5
67.3
89.8
80.5
71.7
92.5
82.5
73.8
95.8
86.6
77.4
SHC
27.2
40.9
54.2
31.4
46.9
62.2
33.4
51.0
63.8
50.6
59.1
73.9
kW
9.86
9.69
9.53
9.86
9.77
9.61
9.95
9.74
9.65
10.01
9.84
9.75
125
TC
77.6
68.7
60.7
82.4
73.3
64.8
84.5
75.3
66.7
89.3
77.8
68.9
SHC
21.8
35.5
48.9
25.7
41.8
57.6
27.5
45.3
57.6
32.7
52.6
66.9
kW
10.93
10.74
10.60
10.91
10.78
10.64
11.00
10.78
10.70
11.10
10.90
10.82
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