Gross Cooling Capacities - Bryant 558D User Manual

Sizes 036-300 commercial single-package rooftop electric cooling units
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559F300 (25 TON)
Air Entering
Evaporator
Capacity MBtuh
Ewb
Cfm
BF
(F)
Total
Sensible
72
323.9
7,000
0.03
67
299.4
62
275.8
72
331.3
8,750
0.05
67
312.7
62
288.4
72
336.1
10,000
0.07
67
319.8
62
294.7
72
342.6
11,250
0.09
67
322.5
62
300.0
559F300 (25 TON) (cont)
Air Entering
Evaporator
Capacity MBtuh
Ewb
Cfm
BF
(F)
Total
Sensible
72
274.6
7,000
0.03
67
237.9
62
207.6
72
286.9
8,750
0.05
67
251.5
62
222.6
72
291.3
10,000
0.07
67
258.4
62
237.7
72
293.9
11,250
0.09
67
267.5
62
247.1
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 (cont)
75
Capacity MBtuh
Compressor
kW
Total
159.4
21.10
315.3
195.2
20.50
290.4
230.6
19.90
264.3
170.1
21.30
326.9
216.5
20.90
303.2
259.1
20.20
278.0
177.6
21.50
333.7
231.1
21.10
309.1
276.6
20.40
285.0
186.6
21.70
335.1
242.9
21.20
314.2
292.6
20.50
291.1
Air Entering Condenser (F)
115
Capacity MBtuh
Compressor
kW
Total
Sensible
140.9
28.80
254.5
170.0
27.80
214.9
198.6
26.80
184.3
154.9
29.40
266.7
193.2
28.20
230.9
222.6
27.40
206.7
164.1
29.60
272.0
208.7
28.50
236.0
237.7
27.70
220.8
163.0
29.70
276.1
224.3
28.50
240.0
247.1
28.10
231.1
Air Entering Condenser (F)
85
Capacity MBtuh
Compressor
kW
Sensible
Total
156.3
22.70
304.1
191.7
22.10
277.4
224.9
21.30
243.1
168.4
23.10
315.3
213.2
22.50
290.1
254.9
21.80
263.8
177.5
23.30
320.4
226.9
22.70
295.6
273.8
22.00
271.1
184.4
23.30
324.1
240.7
22.80
300.6
288.4
22.20
279.4
125
Compressor
kW
133.3
30.90
160.8
29.90
194.3
28.90
148.0
31.40
185.1
30.20
206.7
29.60
157.5
31.70
200.2
30.50
220.8
29.90
166.6
31.90
214.4
30.80
231.1
30.30
t
= Wet-bulb temperature corresponding to enthalpy of air
lwb
leaving evaporator coil (h
h
= h
lwb
ewb
Where: h
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).
25
95
Capacity MBtuh
Compressor
kW
Sensible
Total
152.0
24.80
291.2
186.5
24.00
261.4
215.2
23.20
224.8
165.0
25.20
300.9
208.5
24.50
274.2
248.0
23.50
242.1
173.0
25.40
305.7
222.4
24.60
283.3
266.4
23.80
252.3
181.6
25.50
309.8
236.5
24.80
284.8
279.4
24.10
266.3
)
lwb
total capacity (1000 x MBtuh)
4.5 x cfm
= Enthalpy of air entering evaporator coil.
105
Compressor
kW
Sensible
147.2
26.90
179.7
25.80
206.6
25.00
159.9
27.20
201.8
26.30
237.3
25.40
168.3
27.40
216.8
26.60
252.3
25.80
176.8
27.60
231.1
26.80
266.3
26.00

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