Gross cooling capacities (cont) – Bryant 579F User Manual
Page 28
GROSS COOLING CAPACITIES (cont)
579F216 (18 TON)
Air Entering
Evaporator
Air Entering Condenser (F)
75
85
95
105
Cfm
BF
Ewb
(F)
Capacity MBtuh
Compressor
kW
Capacity MBtuh
Compressor
kW
Capacity MBtuh
Compressor
kW
Capacity MBtuh Compressor
kW
Total
Sensible
Total
Sensible
Total
Sensible
Total
Sensible
5400
0.035
72
233.0
116.7
15.42
226.0
115.2
16.88
217.0
112.4
18.25
206.7
109.0
19.54
67
215.0
148.3
14.99
208.9
145.7
16.35
200.0
142.3
17.66
188.3
138.2
18.94
62
198.8
178.0
14.54
191.1
174.5
15.80
181.3
170.0
17.04
170.3
164.3
18.25
6300
0.045
72
237.0
123.8
15.57
230.0
120.9
16.99
221.0
119.0
18.40
210.9
115.6
19.75
67
221.0
159.2
15.15
212.7
156.6
16.52
204.3
153.3
17.86
193.4
149.7
19.05
62
204.5
193.0
14.73
196.6
189.1
16.03
187.5
184.3
17.31
176.9
176.7
18.57
7200
0.055
72
240.0
132.9
15.66
234.0
126.8
17.13
224.0
125.3
18.55
213.4
122.6
19.94
67
223.0
170.1
15.26
216.0
167.2
16.65
207.8
164.2
18.00
196.8
160.2
19.22
62
209.6
206.1
14.90
202.0
201.2
16.24
194.2
194.0
17.54
185.7
185.6
18.83
8100
0.065
72
239.0
141.6
15.65
236.0
133.0
17.21
227.0
131.4
19.67
216.0
128.7
20.01
67
227.0
180.3
15.36
219.0
176.9
16.73
209.3
174.2
18.07
199.0
170.6
19.38
62
214.6
214.4
15.04
207.6
207.4
16.41
199.8
199.8
17.74
191.0
190.9
19.03
9000
0.075
72
241.0
148.1
15.75
237.0
139.6
17.24
229.0
136.5
18.74
217.0
133.9
20.01
67
227.0
191.2
15.38
221.0
186.9
16.80
211.3
183.7
18.14
200.7
180.0
19.42
62
217.0
217.0
15.12
212.4
211.1
16.55
204.0
203.9
17.91
195.1
195.0
19.22
579F216 (18 TON) (cont)
Air Entering
Evaporator
Air Entering Condenser (F)
115
125
Cfm
BF
Ewb
(F)
Capacity MBtuh
Compressor
kW
Capacity MBtuh
Compressor
kW
Total
Sensible
Total
Sensible
5400
0.035
72
195.4
104.8
20.77
183.9
100.8
21.80
67
178.7
134.2
20.10
167.2
129.8
21.25
62
159.1
157.9
19.40
151.1
151.1
20.61
6300
0.045
72
199.7
111.8
20.95
187.1
107.6
22.10
67
183.0
145.7
20.31
171.8
141.4
21.50
62
169.0
168.9
19.74
160.2
160.1
21.02
7200
0.055
72
203.3
119.3
21.25
189.5
114.3
22.30
67
185.9
156.3
20.48
174.4
152.1
21.60
62
176.3
176.3
20.09
167.6
167.5
21.25
8100
0.065
72
204.1
124.9
21.27
191.5
120.6
22.40
67
187.9
166.4
20.55
176.9
161.6
21.70
62
182.0
182.0
20.30
172.7
172.6
21.60
9000
0.075
72
206.1
131.3
21.40
193.4
127.0
22.60
67
189.8
175.8
20.71
178.9
169.9
21.90
62
186.1
186.0
20.50
176.3
176.3
21.70
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
t
= Wet-bulb temperature corresponding to enthalpy of air
lwb
leaving evaporator coil (h
)
lwb
total capacity (1000 x MBtuh)
h
= h
–
lwb
ewb
4.5 x cfm
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).
28