Bryant 579F User Manual page 186

579F216 (18 Tons) (cont)
Temp (F)
Air Entering
Condenser
(Edb)
54/0.65
TC 223
75 SHC 223
kW 14.3
TC 216
85 SHC 216
kW 15.8
TC 210
95 SHC 210
kW 17.6
TC 202
105 SHC 202
kW 19.4
TC 195
115 SHC 195
kW 21.3
TC 193
117 SHC 193
kW 21.7
TC 191
120 SHC 191
kW 22.3
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)
58/0.53 62/0.40
223
223
14.3
217
217
15.9
210
210
17.6
202
202
19.4
195
195
21.3
193
193
21.7
191
191
22.3
)
lwb
Evaporator Air Quantity — Cfm
9000
Evaporator Air — Ewb (F)/BF
67/0.25
228 239
202 181
14.4 14.6
222 231
194 177
16.0 16.3
215 223
187 174
17.7 18.0
207 214
184 170
19.5 19.7
196 204
192 166
21.4 21.7
194 202
192 166
21.7 22.0
191 199
191 164
22.3 22.6
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
FACTOR
(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).
186
72/0.23 76/0.23
258 275
144 113
15.0 15.4
250 266
141 110
16.7 17.1
241 257
138 107
18.4 18.8
231 —
134 —
20.2 —
221 —
131 —
22.2 —
219 —
130 —
22.6 —
— —
— —
— —
ENTERING AIR DRY-BULB TEMP (F)
79 78 77 76 75
81 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
80/0.05
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—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
under 75
over 85
Use formula
shown below.