Cooling capacities, 542j – Bryant 549B User Manual
Page 146
146
PERFORMANCE DATA — 542J
COOLING CAPACITIES
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
t
lwb
= Wet-bulb temperature corresponding to enthalpy of air leaving indoor
coil (h
lwb
)
Where: h
ewb
= Enthalpy of air entering indoor coil
3. SHC is based on 80 F edb temperature of air entering indoor 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).
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
t
lwb
= Wet-bulb temperature corresponding to enthalpy of air leaving indoor
coil (h
lwb
)
Where: h
ewb
= Enthalpy of air entering indoor coil
3. SHC is based on 80 F edb temperature of air entering indoor 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).
542J150 (12
1
/
2
Tons)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
3750/0.04
4500/0.05
5000/0.05
5625/0.06
6250/0.07
Indoor Entering Air — Ewb (F)
72
67
62
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
167.0
154.0
140.0
171.0
158.0
144.0
173.0
159.0
146.0
171.0
162.0
148.0
173.0
161.0
151.0
SHC
79.6
100.0
120.0
85.0
108.0
131.0
87.5
114.0
138.0
94.5
120.0
146.0
97.7
127.0
150.0
kW
10.00
9.77
9.50
10.10
9.87
9.61
10.20
9.93
9.68
10.20
10.00
9.74
10.20
10.00
9.80
85
TC
160.0
148.0
133.0
164.0
151.0
137.0
167.0
154.0
140.0
168.0
155.0
143.0
166.0
157.0
146.0
SHC
77.6
98.9
118.0
82.0
107.0
129.0
86.1
113.0
136.0
89.6
118.0
142.0
95.3
125.0
146.0
kW
11.10
10.80
10.40
11.20
10.90
10.60
11.30
11.00
10.70
11.30
11.00
10.80
11.30
11.10
10.80
95
TC
155.0
141.0
127.0
157.0
144.0
131.0
160.0
146.0
133.0
161.0
149.0
137.0
163.0
149.0
140.0
SHC
76.1
96.3
115.0
80.3
105.0
126.0
84.4
110.0
132.0
86.5
117.0
137.0
91.7
121.0
140.0
kW
12.20
11.80
11.40
12.20
11.90
11.50
12.40
12.00
11.60
12.40
12.10
11.80
12.50
12.10
11.90
105
TC
147.0
133.0
120.0
150.0
137.0
124.0
152.0
138.0
127.0
153.0
140.0
131.0
154.0
141.0
134.0
SHC
73.6
93.3
112.0
78.5
102.0
123.0
81.6
108.0
127.0
85.1
114.0
131.0
88.6
120.0
134.0
kW
13.20
12.70
12.30
13.30
12.90
12.50
13.40
13.00
12.60
13.50
13.10
12.80
13.50
13.10
12.90
115
TC
140.0
126.0
112.0
141.0
129.0
118.0
144.0
130.0
121.0
144.0
131.0
125.0
146.0
133.0
128.0
SHC
71.4
90.3
109.0
75.1
99.1
117.0
78.9
104.0
121.0
81.9
110.0
125.0
87.0
117.0
128.0
kW
14.20
13.70
13.20
14.30
13.90
13.50
14.40
14.00
13.70
14.50
14.00
13.90
14.60
14.10
14.00
125
TC
131.0
118.0
105.0
134.0
120.0
111.0
135.0
122.0
115.0
137.0
123.0
118.0
136.0
124.0
121.0
SHC
68.1
87.6
105.0
73.5
96.4
111.0
75.7
102.0
115.0
80.7
108.0
118.0
83.4
113.0
121.0
kW
15.20
14.70
14.10
15.40
14.90
14.50
15.40
14.90
14.70
15.60
15.00
14.90
15.60
15.10
15.00
BF
— Bypass Factor
Edb
— Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW
— Compressor Motor Power Input
SHC — Gross Sensible Heat Capacity (1000 Btuh)
TC
— Gross Total Capacity (1000 Btuh)
t
ldb
= t
edb
–
sensible capacity (Btuh)
1.10 x cfm
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
542J180 (15 Tons)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
4500/0.06
5250/0.08
6000/0.10
6750/0.10
7500/0.12
Indoor Entering Air — Ewb (F)
72
67
62
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
210.0
192.0
173.4
216.0
196.6
178.4
220.0
202.0
182.2
222.0
204.0
185.6
224.0
206.0
190.2
SHC
100.6
125.2
148.2
106.0
134.0
160.6
110.6
143.0
172.2
115.0
151.2
183.2
120.2
158.2
190.0
kW
13.58
13.12
12.66
13.76
13.28
12.84
13.88
13.44
12.98
13.96
13.52
13.10
14.02
13.60
13.26
85
TC
202.0
183.0
164.4
208.0
187.8
169.0
212.0
191.4
172.8
212.0
194.0
177.2
214.0
195.8
182.2
SHC
98.0
121.8
144.2
103.8
131.2
156.4
109.0
140.0
168.6
112.0
148.0
177.0
116.2
155.6
182.2
kW
14.86
14.32
13.78
15.08
14.52
13.98
15.22
14.66
14.14
15.26
14.78
14.30
15.34
14.86
14.50
95
TC
192.4
173.2
155.0
196.2
177.8
159.2
200.0
180.8
163.4
202.0
183.4
169.0
204.0
185.4
174.2
SHC
94.8
118.0
140.0
100.2
127.4
152.6
105.6
136.4
163.4
110.6
144.8
169.0
114.2
153.2
173.8
kW
16.16
15.52
14.88
16.32
15.72
15.10
16.48
15.88
15.30
16.62
16.00
15.54
16.64
16.12
15.76
105
TC
182.0
163.0
145.0
186.4
167.0
149.4
188.6
170.0
155.4
191.0
172.2
160.8
193.0
173.8
165.2
SHC
91.0
114.2
135.2
96.8
123.6
147.6
101.8
132.6
155.2
107.2
141.2
160.6
112.2
149.6
165.2
kW
17.36
16.64
15.92
17.58
16.86
16.16
17.70
17.04
16.48
17.84
17.18
16.74
17.94
17.28
16.96
115
TC
171.2
152.4
134.8
175.0
156.2
140.6
177.8
158.8
146.8
179.4
160.8
152.2
179.6
162.2
156.4
SHC
87.4
110.2
130.8
92.6
119.4
140.6
98.8
128.2
146.8
103.6
136.8
151.8
107.2
144.6
156.2
kW
18.54
17.72
16.90
18.76
17.94
17.24
18.94
18.12
17.60
19.02
18.28
17.90
19.04
18.38
18.16
125
TC
159.4
141.2
125.0
162.8
143.8
132.0
165.6
147.0
137.8
166.6
148.8
143.0
168.2
150.0
146.8
SHC
83.6
105.8
125.0
89.0
115.0
131.8
94.4
123.6
137.8
99.8
132.2
142.8
105.0
139.6
146.6
kW
19.64
18.74
17.88
19.86
19.00
18.34
20.00
19.12
18.72
20.20
19.28
19.00
20.20
19.40
19.28
BF
— Bypass Factor
Edb
— Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW
— Compressor Motor Power Input
SHC — Gross Sensible Heat Capacity (1000 Btuh)
TC
— Gross Total Capacity (1000 Btuh)
t
ldb
= t
edb
–
sensible capacity (Btuh)
1.10 x cfm
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
5
42J