Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual
Page 19
19
PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
Standard Ratings
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
Where h
ewb
= Enthalpy of air entering indoor coil.
3. The SHC is based on 80 F edb temperature of air entering evap-
orator coil.
Below 80 F db, subtract (corr factor x cfm) from SHC.
Above 80 F db, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (db – 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 (F)
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
70.8
65.4
58.5
72.5
67.3
61.1
73.0
68.4
62.8
74.8
70.3
64.8
SHC
34.1
42.7
49.9
35.7
45.5
54.2
36.8
48.0
57.8
39.6
53.0
63.4
kW
3.53
3.49
3.44
3.55
3.50
3.46
3.55
3.51
3.47
3.57
3.54
3.48
85
TC
68.9
63.2
55.3
70.5
65.1
57.9
72.2
66.4
60.2
73.2
68.1
62.9
SHC
33.5
41.8
48.4
35.0
44.8
52.8
37.0
47.6
56.8
39.3
52.5
62.4
kW
3.98
3.94
3.87
4.00
3.96
3.90
4.03
3.97
3.92
4.04
3.99
3.94
95
TC
66.8
60.6
52.4
68.3
62.5
54.3
69.3
63.8
56.6
71.2
65.6
60.6
SHC
32.8
40.7
47.0
34.5
43.8
51.1
36.0
46.7
55.0
39.1
51.8
60.5
kW
4.48
4.43
4.35
4.50
4.45
4.37
4.51
4.46
4.40
4.55
4.48
4.44
105
TC
64.3
57.7
49.9
65.9
59.8
51.7
66.9
61.1
54.1
68.4
62.8
58.4
SHC
32.0
39.6
45.8
33.7
42.8
49.7
35.3
45.7
53.5
38.4
51.0
58.4
kW
5.03
4.96
4.87
5.05
4.99
4.90
5.06
5.00
4.93
5.08
5.02
4.98
115
TC
61.5
54.8
47.3
62.8
56.7
49.1
64.0
58.2
51.6
65.4
59.9
56.1
SHC
31.0
38.4
44.5
32.5
41.6
48.2
34.4
44.6
51.6
37.4
50.0
56.1
kW
5.61
5.55
5.46
5.62
5.58
5.49
5.65
5.60
5.52
5.67
5.61
5.57
125
TC
58.7
51.6
44.5
59.9
53.4
46.2
60.8
54.9
49.0
62.2
56.8
53.5
SHC
30.0
37.2
43.1
31.7
40.4
46.2
33.3
43.4
48.9
36.4
48.9
53.4
kW
6.27
6.19
6.09
6.28
6.21
6.13
6.29
6.24
6.17
6.31
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 (F)
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
86.7
80.7
74.4
88.8
82.7
76.6
90.5
84.4
78.2
92.6
86.3
81.0
SHC
43.0
53.7
63.8
45.0
57.4
68.9
47.2
61.2
73.6
51.2
67.4
80.7
kW
4.58
4.46
4.33
4.63
4.50
4.38
4.67
4.55
4.41
4.72
4.58
4.47
85
TC
84.1
78.2
72.0
86.4
80.3
74.1
88.2
81.7
75.7
90.2
84.0
78.8
SHC
42.0
52.6
62.7
44.5
56.6
68.0
46.8
60.2
72.5
50.6
67.4
78.7
kW
5.10
4.97
4.85
5.16
5.03
4.90
5.21
5.06
4.93
5.26
5.12
4.99
95
TC
81.3
75.3
69.2
83.4
77.3
71.3
85.1
78.9
72.9
87.2
80.6
76.2
SHC
41.0
51.4
61.4
43.4
55.3
66.6
45.8
59.2
71.2
50.2
65.8
76.2
kW
5.65
5.52
5.39
5.71
5.57
5.44
5.77
5.62
5.48
5.83
5.66
5.55
105
TC
77.9
72.0
66.1
80.0
73.8
68.0
81.6
75.3
69.6
83.4
77.1
73.2
SHC
39.7
50.2
60.0
42.2
54.0
65.2
44.6
57.8
69.3
49.0
64.5
73.2
kW
6.22
6.08
5.94
6.29
6.13
6.00
6.34
6.17
6.04
6.40
6.22
6.12
115
TC
74.7
68.4
61.8
75.9
70.0
64.1
77.6
71.3
66.5
78.7
73.0
70.1
SHC
38.7
48.8
58.1
40.8
52.6
63.2
43.3
56.4
66.4
46.9
63.2
70.0
kW
6.84
6.68
6.49
6.87
6.71
6.56
6.93
6.75
6.63
6.96
6.80
6.72
125
TC
70.3
63.6
57.2
71.8
65.5
59.1
72.9
66.8
61.9
74.0
68.6
66.4
SHC
37.2
47.0
55.8
39.5
51.0
59.1
41.7
55.0
61.9
45.4
61.8
66.3
kW
7.43
7.25
7.03
7.48
7.30
7.13
7.51
7.35
7.22
7.54
7.41
7.33
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 heat capacity (Btuh)
1.10 x cfm
t
lwb
= wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (h
lwb
)
h
lwb
= h
ewb
–
total capacity (Btuh)
4.5 x cfm