Gross Cooling Capacities - Bryant 558D User Manual
Sizes 036-300 commercial single-package rooftop electric cooling units
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Also See for 558D:
- Installation, start-up and service instructions manual (40 pages) ,
- Installation instructions manual (12 pages)
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558D036 (3 TON)
Air Entering
Evaporator
Ewb
Cfm
BF
(F)
Total
72
900
0.11
67
62
72
1200
0.14
67
62
72
1500
0.17
67
62
558D036 (3 TON) (cont)
Air Entering
Evaporator
Ewb
Cfm
BF
(F)
Total
72
900
0.11
67
62
72
1200
0.14
67
62
72
1500
0.17
67
62
558D048 (4 TON)
Air Entering
Evaporator
Ewb
Cfm
BF
(F)
Total
72
1200
0.12
67
62
72
1600
0.15
67
62
72
2000
0.18
67
62
558D048 (4 TON) (cont)
Air Entering
Evaporator
Ewb
Cfm
BF
(F)
Total
72
1200
0.12
67
62
72
1600
0.15
67
62
72
2000
0.18
67
62
LEGEND
BF
— Bypass Factor
Edb
— Entering Dry Bulb
Ewb
— Entering Wet Bulb
kW
— Compressor Motor Power Input
MBtuh — Btuh in thousands
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (1000 x MBtuh)
t
= t
–
ldb
edb
1.10 x cfm
GROSS COOLING CAPACITIES
75
Capacity MBtuh
Compressor
kW
Sensible
42.8
20.0
2.91
38.9
24.5
2.81
35.0
28.7
2.70
44.8
21.8
2.99
40.8
27.5
2.88
37.0
32.8
2.78
45.8
23.0
3.02
41.9
30.0
2.92
38.2
36.0
2.82
Air Entering Condenser (F)
105
Capacity MBtuh
Compressor
kW
Sensible
36.5
17.8
3.55
32.8
22.1
3.41
29.2
25.9
3.27
38.1
19.6
3.63
34.3
25.2
3.49
30.9
29.8
3.35
39.0
21.2
3.68
35.2
28.0
3.54
32.4
32.3
3.43
75
Capacity MBtuh
Compressor
kW
Sensible
57.9
27.2
4.07
53.1
33.3
3.93
48.3
39.2
3.79
60.4
29.4
4.17
55.9
37.2
4.03
51.3
44.8
3.90
62.2
31.4
4.24
57.3
40.3
4.08
52.9
49.1
3.96
Air Entering Condenser (F)
105
Capacity MBtuh
Compressor
kW
Sensible
50.1
24.4
5.00
45.3
30.3
4.81
39.8
35.1
4.62
52.3
26.7
5.10
47.6
34.5
4.91
42.8
40.7
4.73
53.6
28.8
5.17
48.9
38.1
4.99
44.9
44.6
4.84
Air Entering Condenser (F)
85
Capacity MBtuh
Compressor
kW
Total
Sensible
40.8
19.4
3.14
36.9
23.7
3.01
33.3
27.9
2.90
42.5
21.0
3.20
38.7
26.8
3.08
35.0
31.8
2.97
43.6
22.6
3.24
39.9
29.7
3.14
36.1
35.1
3.02
115
Capacity MBtuh
Compressor
kW
Total
Sensible
34.3
17.0
3.76
30.7
21.3
3.60
26.9
24.8
3.45
35.7
19.0
3.84
32.1
24.4
3.68
28.8
28.8
3.54
36.5
20.5
3.88
32.9
27.1
3.74
30.6
30.6
3.64
Air Entering Condenser (F)
85
Capacity MBtuh
Compressor
kW
Total
Sensible
55.7
26.4
4.40
50.8
32.5
4.24
45.3
37.8
4.08
57.7
28.4
4.47
53.4
36.7
4.35
48.5
43.6
4.20
59.4
30.5
4.54
55.0
40.3
4.42
50.2
47.9
4.25
115
Capacity MBtuh
Compressor
kW
Total
Sensible
47.3
23.4
5.30
42.6
29.2
5.07
37.2
33.7
4.88
49.3
25.9
5.42
44.6
33.3
5.19
40.0
39.3
4.99
50.5
27.8
5.48
45.9
37.1
5.28
42.4
42.4
5.12
t
= Wet-bulb temperature corresponding to enthalpy of air
lwb
leaving evaporator coil (h
total capacity (1000 x MBtuh)
h
= h
–
lwb
ewb
Where: h
= Enthalpy of air entering evaporator coil.
ewb
3. The sensible heat capacity is based on 80 F entering dry-bulb (edb) tempera-
ture of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from the sensible heat capacity.
Above 80 F edb, add (corr factor x cfm) to the sensible heat capacity.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
18
95
Capacity MBtuh
Compressor
Total
Sensible
38.7
18.6
34.9
22.9
31.4
27.0
40.4
20.3
36.6
26.0
33.0
30.9
41.4
22.0
37.6
28.8
34.1
34.0
95
Capacity MBtuh
Compressor
Total
Sensible
52.9
25.5
48.1
31.5
42.5
36.4
55.2
27.6
50.5
35.6
45.7
42.2
56.7
29.7
52.0
39.2
47.4
46.7
)
lwb
4.5 x cfm
kW
3.35
3.21
3.09
3.42
3.29
3.16
3.47
3.35
3.22
kW
4.70
4.54
4.36
4.78
4.63
4.47
4.87
4.70
4.56
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