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184
PERFORMANCE DATA — 579F (cont)
COOLING CAPACITIES (cont)
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
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.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
579F180 (15 Tons) (cont)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm
7500
Evaporator Air — Ewb (F)/BF
54/0.65 58/0.52 62/0.41 67/0.30 72/0.28 76/0.27 80/0.03
75
TC 188 183 193 206 223 239 256
SHC 188 183 170 148 120 95 70
kW 12.9 12.8 13.0 13.2 13.6 13.9 14.2
85
TC 183 183 187 199 215 233 249
SHC 183 183 167 145 117 94 68
kW 14.4 14.4 14.4 14.7 15.1 15.9 16.3
95
TC 177 177 181 191 207 222 237
SHC 177 177 161 142 114 90 65
kW 15.9 15.9 16.0 16.3 16.7 17.0 17.3
105
TC 171 171 175 183 199 213 228
SHC 171 171 154 138 111 87 62
kW 17.6 17.6 17.7 18.0 18.4 18.7 19.0
115
TC 164 164 169 175 190 203 217
SHC 164 164 146 135 108 84 59
kW 19.4 19.4 19.5 19.7 20.2 20.5 20.9
117
TC 163 163 167 173 188 201 —
SHC 163 163 145 134 107 84 —
kW 19.7 19.7 19.9 20.0 20.5 20.9 —
120
TC 161 161 165 170 — — —
SHC 161 161 143 133 — — —
kW 20.2 20.3 20.4 20.6 — — —
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
lwb
)
h
lwb
=h
ewb
–
total capacity (Btuh)
4.5 x cfm
BYPASS
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