Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual
Page 22
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PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH PERFECT HUMIDITY™ OPTION
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).
581B036 (3 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
900/0.14
1200/0.17
1500/0.20
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
75
TC
41.3
37.3
34.3
43.5
39.2
35.9
45.5
41.6
38.2
SHC
17.5
22.4
26.7
19.6
25.5
31.2
21.5
28.5
35.2
kW
2.19
2.14
2.10
2.21
2.16
2.14
2.24
2.19
2.16
85
TC
38.6
34.4
31.6
41.3
37.5
33.3
43.5
38.6
35.5
SHC
15.2
20.1
25.1
17.1
23.2
29.0
18.9
26.3
32.9
kW
2.46
2.40
2.37
2.47
2.43
2.40
2.51
2.45
2.42
95
TC
35.9
31.4
28.8
39.2
35.9
30.6
41.3
35.7
32.9
SHC
13.0
17.9
23.3
14.5
21.1
26.9
16.1
24.2
30.6
kW
2.74
2.68
2.63
2.76
2.74
2.67
2.80
2.75
2.71
105
TC
33.8
29.7
27.4
36.3
32.2
28.7
38.1
32.8
30.4
SHC
10.9
15.8
21.0
12.5
18.9
24.6
14.0
21.7
28.1
kW
3.05
3.00
2.97
3.09
3.04
2.99
3.12
3.07
3.03
115
TC
31.8
28.0
25.5
33.2
28.7
26.5
34.9
30.0
27.9
SHC
9.0
13.7
18.4
10.3
16.8
22.3
11.9
19.3
25.2
kW
3.40
3.36
3.31
3.45
3.38
3.32
3.48
3.41
3.37
125
TC
28.7
26.3
23.4
29.7
25.5
22.9
31.3
27.1
25.5
SHC
6.9
12.2
17.3
7.9
14.5
20.6
9.2
17.3
22.3
kW
3.78
3.73
3.66
3.84
3.77
3.71
3.87
3.79
3.75
581B048 (4 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
1200/0.17
1450/0.19
1600/0.21
2000/0.24
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
52.9
47.5
41.5
55.7
50.9
47.5
57.0
51.7
48.1
60.5
55.6
52.1
SHC
22.7
28.4
33.4
26.1
34.1
38.9
25.9
33.7
41.6
29.4
39.1
47.5
kW
2.87
2.86
2.82
2.89
2.87
2.84
2.89
2.86
2.85
2.90
2.88
2.85
85
TC
49.2
43.8
37.1
52.1
47.2
43.6
52.9
47.9
43.7
55.4
51.4
47.0
SHC
19.8
25.5
30.4
22.2
29.5
35.8
22.4
31.1
38.7
24.2
36.0
44.3
kW
3.26
3.25
3.21
3.28
3.26
3.23
3.28
3.26
3.24
3.28
3.26
3.24
95
TC
45.8
40.1
32.8
48.2
43.6
39.4
48.8
44.0
39.3
51.7
47.4
43.0
SHC
17.2
22.5
27.3
18.4
24.8
32.6
19.0
28.1
35.9
20.7
33.0
41.0
kW
3.71
3.68
3.64
3.72
3.69
3.67
3.72
3.69
3.67
3.74
3.70
3.68
105
TC
41.6
37.0
29.7
43.2
38.9
35.4
43.9
39.7
34.7
46.5
41.4
37.5
SHC
13.5
19.5
23.9
14.7
21.7
29.2
15.0
23.7
30.6
16.4
27.8
35.1
kW
4.20
4.17
4.11
4.20
4.17
4.14
4.20
4.17
4.15
4.22
4.19
4.16
115
TC
37.2
33.2
27.1
38.4
34.0
30.8
39.4
35.5
30.0
41.3
35.2
31.9
SHC
9.9
16.4
20.7
11.3
18.5
25.6
11.2
19.7
25.4
12.4
22.4
28.6
kW
4.73
4.68
4.62
4.74
4.71
4.64
4.73
4.72
4.65
4.74
4.72
4.69
125
TC
32.4
28.1
24.9
33.8
28.1
27.4
35.3
30.5
26.6
36.1
32.0
28.7
SHC
7.2
12.9
18.3
8.4
14.5
21.9
16.8
21.1
21.2
9.5
18.3
24.1
kW
5.29
5.23
5.15
5.30
5.25
5.19
5.29
5.27
5.21
5.30
5.29
5.25
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