35 performance data (cont), Cooling capacities (cont) – Bryant 581A/B User Manual
Page 35
35
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 evaporator coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
580F120 (10 TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
3000/0.095
4000/0.125
5000/0.15
Air Entering Evaporator — Ewb (F)
72
67
62
72
67
62
72
67
62
75
TC
135.8
124.8
112.0
142.4
130.6
119.8
146.5
134.2
123.7
SHC
66.8
82.6
97.4
73.2
93.4
112.7
79.7
104.4
123.1
kW
9.76
9.41
9.10
10.00
9.61
9.27
10.17
9.75
9.41
85
TC
130.0
119.6
104.0
136.0
125.0
114.5
140.0
127.9
118.8
SHC
64.3
80.5
93.8
71.1
91.7
110.2
77.5
101.8
118.7
kW
10.41
10.07
9.74
10.67
10.28
9.94
10.84
10.41
10.09
95
TC
124.1
113.7
96.7
129.5
118.9
106.9
132.8
122.0
114.1
SHC
62.2
78.4
90.0
69.1
89.8
105.9
74.9
100.1
114.0
kW
11.13
10.78
10.40
11.38
10.99
10.63
11.52
11.14
10.83
105
TC
118.1
104.6
87.9
122.7
111.8
98.5
126.0
115.1
108.0
SHC
60.4
74.9
85.2
66.9
87.7
98.5
73.1
98.3
108.0
kW
11.93
11.52
11.10
12.13
11.74
11.41
12.27
11.89
11.65
115
TC
115.0
98.0
84.2
120.0
103.8
93.4
122.6
109.8
102.8
SHC
59.4
72.4
83.4
66.4
84.8
93.4
72.8
96.9
102.8
kW
12.26
11.82
11.40
12.48
12.06
11.78
12.60
12.20
12.00
580F121 (10 TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
3000/0.095
4000/0.125
5000/0.15
Air Entering Evaporator — Ewb (F)
72
67
62
72
67
62
72
67
62
75
TC
138.2
127.0
114.0
145.0
132.9
122.0
149.1
136.6
125.9
SHC
68.0
84.1
99.1
74.5
95.1
114.7
81.1
106.3
125.3
kW
8.37
8.07
7.80
8.57
8.24
7.95
8.72
8.36
8.07
85
TC
132.3
121.7
105.9
138.4
127.2
116.6
142.5
130.2
120.9
SHC
65.5
81.9
95.5
72.4
93.3
112.2
78.9
103.6
120.8
kW
8.92
8.63
8.35
9.15
8.81
8.52
9.29
8.92
8.65
95
TC
126.3
115.7
98.4
131.8
121.0
108.8
135.2
124.2
116.1
SHC
63.3
79.8
91.6
70.3
91.4
107.8
76.2
101.9
116.0
kW
9.54
9.24
8.91
9.75
9.42
9.11
9.87
9.55
9.28
105
TC
120.2
106.5
89.5
124.9
113.8
100.3
128.3
117.2
109.9
SHC
61.5
76.2
86.7
68.1
89.3
100.3
74.4
100.1
109.9
kW
10.23
9.87
9.51
10.40
10.06
9.78
10.52
10.19
9.99
115
TC
117.1
99.8
85.7
122.2
105.7
95.1
124.8
111.8
104.6
SHC
60.5
73.7
84.9
67.6
86.3
95.1
74.1
98.6
104.6
kW
10.51
10.13
9.77
10.70
10.34
10.10
10.80
10.46
10.29
580F150 (12
1
/
2
TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
3750/0.08
4500/0.09
5000/0.10
6250/0.12
Air Entering Evaporator — Ewb (F)
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
175.6
162.2
149.2
181.0
167.5
154.2
182.9
170.2
156.4
187.2
174.7
161.8
SHC
85.7
107.3
128.0
91.4
116.2
140.3
94.2
122.2
146.5
102.1
135.3
160.7
kW
11.16
10.85
10.57
11.32
11.00
10.69
11.37
11.07
10.73
11.49
11.19
10.87
85
TC
169.3
155.7
140.6
174.2
160.7
147.0
176.9
163.0
149.7
181.5
167.3
155.8
SHC
83.9
104.8
124.0
89.6
113.9
137.0
92.7
119.7
143.6
100.9
133.4
155.6
kW
12.15
11.78
11.42
12.31
11.94
11.58
12.39
12.01
11.63
12.53
12.14
11.82
95
TC
161.9
148.9
132.0
166.8
153.5
139.1
169.5
155.7
142.8
173.2
159.5
149.6
SHC
81.4
102.0
119.8
87.0
111.1
133.2
90.7
117.3
140.2
98.3
130.8
149.6
kW
13.12
12.72
12.28
13.30
12.89
12.46
13.40
12.97
12.56
13.54
13.11
12.78
105
TC
154.9
141.3
123.0
158.8
145.4
130.2
160.9
147.6
135.0
165.3
151.2
143.2
SHC
79.0
99.2
115.5
84.5
108.2
128.1
87.8
114.3
134.9
96.6
127.8
143.1
kW
14.16
13.66
13.17
14.31
13.82
13.35
14.38
13.91
13.48
14.58
14.07
13.77
115
TC
146.2
132.2
113.1
150.5
137.0
122.4
152.3
139.4
127.8
155.2
142.7
136.0
SHC
76.1
95.7
110.3
81.7
105.2
122.3
85.0
111.6
127.7
92.9
125.0
135.8
kW
15.09
14.57
14.07
15.30
14.76
14.25
15.37
14.87
14.43
15.49
15.02
14.73
BF
—
Bypass Factor
Edb
—
Entering Dry-Bulb
Ewb —
Entering Wet-Bulb
kW
—
Compressor Motor Power Input
Ldb
—
Leaving Dry-Bulb
Lwb —
Leaving Wet-Bulb
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
BYPASS
FACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)
79
78
77
76
75
under 75
81
82
83
84
85
over 85
Correction Factor
.05
1.04
2.07
3.11
4.14
5.18
Use formula
shown below.
.10
.98
1.96
2.94
3.92
4.90
.20
.87
1.74
2.62
3.49
4.36
.30
.76
1.53
2.29
3.05
3.82
58
0
F
03
6-
15
1