Bryant 579F User Manual page 190

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