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187
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).
579F240 (20 Tons)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm
6,000 7,000
Evaporator Air — Ewb (F)/BF
54/0.48 58/0.31 62/0.21 67/0.19 72/0.17 76/0.22 80/0.05 54/0.54 58/0.37 62/0.25 67/0.21 72/0.19 76/0.21 80/0.04
75
TC 217 222 232 252 274 294 316 227 231 238 254 281 297 322
SHC 217 199 189 163 136 112 90 227 217 202 172 143 115 91
kW 15.1 15.2 15.4 15.8 16.2 16.6 17.0 15.3 15.4 15.5 15.9 16.4 16.5 17.2
85
TC 212 217 226 244 266 285 306 222 225 231 250 272 291 312
SHC 212 194 185 159 133 109 87 222 211 198 170 140 113 88
kW 16.9 17.2 17.3 17.6 18.0 18.4 18.8 17.1 17.3 17.3 17.7 18.2 18.6 19.0
95
TC 206 208 217 236 257 276 295 215 216 223 241 262 281 301
SHC 206 197 181 156 129 106 84 215 213 194 166 136 110 84
kW 18.9 18.8 19.0 19.5 20.0 20.4 20.8 19.0 19.0 19.2 19.6 20.1 20.5 21.0
105
TC 199 202 209 227 247 265 285 208 209 215 232 252 270 —
SHC 199 190 177 152 126 103 80 208 209 189 163 132 107 —
kW 20.8 20.9 21.1 21.6 22.0 22.5 22.9 21.0 21.0 21.2 21.7 22.2 22.6 —
115
TC 192 194 200 218 237 254 — 202 202 207 222 242 259 —
SHC 192 192 173 149 122 99 — 202 202 183 159 129 103 —
kW 23.0 22.9 23.3 23.8 24.3 24.8 — 23.2 23.2 23.5 23.9 24.5 24.9 —
117
TC 191 191 199 216 235 252 — 200 200 205 220 240 257 —
SHC 191 191 172 148 121 99 — 200 200 182 158 128 102 —
kW 23.5 23.5 23.7 24.2 24.8 25.2 — 23.8 23.8 23.9 24.4 24.9 25.3 —
120
TC 189 189 196 213 232 249 — 197 198 203 217 236 — —
SHC 189 189 170 147 120 98 — 197 198 181 156 127 — —
kW 24.2 24.2 24.4 25.0 25.5 25.9 — 24.5 24.5 24.6 25.1 25.6 — —
579F240 (20 Tons) (cont)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm
8,000 9,000
Evaporator Air — Ewb (F)/BF
54/0.58 58/0.43 62/0.30 67/0.23 72/0.21 76/0.22 80/0.04 54/0.62 58/0.48 62/0.35 67/0.24 72/0.23 76/0.23 80/0.04
75
TC 236 238 241 259 286 302 328 244 244 250 267 290 307 —
SHC 236 232 211 181 149 119 91 244 244 222 192 155 123 —
kW 15.5 15.5 15.6 15.9 16.5 16.6 17.3 15.7 15.7 15.8 16.1 16.6 16.7 —
85
TC 231 230 237 254 276 296 — 237 238 243 258 281 300 —
SHC 231 230 209 179 146 117 — 237 238 216 189 152 121 —
kW 17.5 17.3 17.4 17.8 18.3 18.7 — 17.5 17.6 17.6 18.0 18.4 18.8 —
95
TC 223 223 229 245 267 285 — 231 230 235 249 270 289 —
SHC 223 223 203 176 142 114 — 231 230 209 185 148 117 —
kW 19.2 19.2 19.3 19.8 20.2 20.6 — 19.5 19.4 19.5 19.8 20.3 20.8 —
105
TC 216 216 221 236 256 274 — 222 223 228 239 260 278 —
SHC 216 216 197 172 139 110 — 222 223 202 181 145 114 —
kW
21.3 21.3 21.4 21.8 22.3 22.7 — 21.4 21.5 21.6 21.9 22.4 22.8 —
115
TC 208 209 213 226 246 263 — 214 214 220 229 249 266 —
SHC 208 209 190 168 135 107 — 214 214 193 177 141 110 —
kW 23.5 23.5 23.7 24.0 24.6 25.0 — 23.7 23.7 23.9 24.2 24.7 25.1 —
117
TC 207 207 212 224 243 260 — 213 213 219 227 246 263 —
SHC 207 207 188 167 134 106 — 213 213 191 176 140 109 —
kW 24.0 24.0 24.1 24.5 25.0 25.5 — 24.2 24.2 24.2 24.6 25.1 25.6 —
120
TC 204 205 209 221 240 — — 210 210 215 224 243 — —
SHC 204 205 185 166 133 — — 210 210 193 175 139 — —
kW 24.7 24.7 24.8 25.2 25.7 — — 24.9 24.9 25.0 25.3 25.8 — —
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
579F180-300