Bryant 581C Manual De Usuario
190
PERFORMANCE DATA — 579F (cont)
COOLING CAPACITIES (cont)
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
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.
Above 80 F edb, add (corr factor x cfm) to SHC.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
579F300 (25 Tons) (cont)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm
11,250
Evaporator Air — Ewb (F)/BF
54/0.61
58/0.47
62/0.30
67/0.16
72/0.17
76/0.17
80/0.00
75
TC
295
295
298
319
342
367
392
SHC
295
295
285
245
193
151
108
kW
20.3
20.3
20.4
20.9
21.2
21.5
21.9
85
TC
288
287
289
310
334
359
384
SHC
288
287
278
241
190
148
106
kW
22.5
22.4
22.4
23.1
23.7
24.4
25.3
95
TC
278
278
280
318
323
346
—
SHC
278
278
269
150
186
144
—
kW
24.6
24.6
24.7
30.0
26.0
26.7
—
105
TC
269
269
272
285
310
332
—
SHC
269
269
259
232
182
140
—
kW
27.0
27.0
27.1
27.6
28.4
29.1
—
115
TC
259
260
262
273
297
318
—
SHC
259
260
247
227
177
136
—
kW
29.7
29.6
29.8
30.2
31.1
31.8
—
117
TC
257
257
261
271
294
—
—
SHC
257
257
245
226
176
—
—
kW
30.3
30.3
30.3
30.7
31.6
—
—
120
TC
254
254
257
267
—
—
—
SHC
254
254
242
224
—
—
—
kW
31.1
31.1
31.3
31.6
—
—
—
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
leaving evaporator coil (h
lwb
)
h
lwb
=
h
ewb
–
total capacity (Btuh)
4.5 x cfm
BYPASS
FACTOR
FACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)
79
78
77
76
75
under 75
81
82
83
84
85
over 85
Correction Factor
0.05
1.04
2.07
3.11
4.14
5.18
Use formula
shown below.
0.10
0.98
1.96
2.94
3.92
4.91
0.20
0.87
1.74
2.62
3.49
4.36
0.30
0.76
1.53
2.29
3.05
3.82
0.40
0.65
1.31
1.96
2.62
3.27
0.50
0.55
1.09
1.64
2.18
2.73
0.60
0.44
0.87
1.31
1.74
2.18
0.70
0.33
0.65
0.98
1.31
1.64