Bryant DURAPAC 551B - Manual (Page 122)

122
PERFORMANCE DATA (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).
GENERAL FAN PERFORMANCE NOTES
NOTES:
1. Values include losses for filters, unit casing, and wet coils. See
page 125 for accessory/factory-installed option static pressure
information.
2. Extensive motor and electrical testing on these units ensures that
the full range of the motor can be utilized with confidence. Using
your fan motors up to the wattage ratings shown will not result in
nuisance tripping or premature motor failure. Unit warranty will not
be affected. See Evaporator-Fan Motor Performance table on
page 126 for additional information.
3. Use of a field-supplied motor may affect wire sizing. Contact your
Bryant representative for details.
4. Interpolation is permissible. Do not extrapolate.
559F240 (20 TONS) — UNITS WITH PERFECT HUMIDITY™ OPTION
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
6,000/0.07 7,000/0.09 8,000/0.1 9,000/0.11 10,000/0.12
Evaporator Air — Ewb (F)
62 67 72 62 67 72 62 67 72 62 67 72 62 67 72
75
TC — 237 261 — 249 269 — 254 274 — 252 279 230 255 283
SHC — 141 111 — 155 118 — 166 125 — 175 132 228 186 139
kW — 16.2 16.9 — 17.3 17.1 — 17.2 17.3 — 16.7 17.5 16.3 16.9 17.6
85
TC — 227 251 — 233 257 — 238 263 — 241 267 220 243 269
SHC — 133 103 — 145 110 — 157 117 — 166 123 220 177 129
kW — 17.5 18.2 — 17.8 18.3 — 18.0 18.5 — 18.6 18.7 17.4 17.7 18.3
95
TC — 215 238 — 221 246 — 224 249 207 228 254 211 231 256
SHC — 125 94 — 136 102 — 147 108 199 158 114 210 167 120
kW — 18.7 19.0 — 18.8 19.6 — 18.6 19.6 18.6 19.3 19.9 19.1 19.4 20.1
105
TC — 205 227 — 208 230 — 214 237 195 213 241 198 217 241
SHC — 117 86 — 128 92 — 138 99 188 147 104 198 156 110
kW — 20.2 20.9 — 20.0 20.3 — 20.7 21.3 19.8 19.9 21.2 19.9 20.6 20.9
115
TC — 190 211 — 195 217 — 197 219 183 203 222 186 204 227
SHC — 108 77 — 119 82 — 127 88 176 138 94 186 147 99
kW — 21.2 22.1 — 21.6 22.2 — 21.2 22.1 21.1 22.1 22.1 21.3 21.9 22.6
125
TC — 176 196 — 179 198 — 183 204 169 183 207 172 185 207
SHC — 97 65 — 107 70 — 116 76 165 124 81 172 133 86
kW — 22.8 23.4 — 22.8 22.9 — 23.0 23.7 22.5 22.8 24.1 22.7 22.9 23.9
559F300 (25 TONS) — UNITS WITH PERFECT HUMIDITY OPTION
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm/BF
7,000/0.05 8,000/0.06 9,000/0.07 10,000/0.08 11,250/0.09
Evaporator Air — Ewb (F)
62 67 72 62 67 72 62 67 72 62 67 72 62 67 72
75
TC — 287 325 — 301 332 — 300 331 272 299 336 278 304 341
SHC — 175 139 — 191 148 — 204 156 259 214 163 276 228 177
kW — 20.6 22.4 — 21.7 22.7 — 21.0 22.0 19.7 20.4 22.2 19.9 20.6 22.4
85
TC — 268 298 — 277 306 — 281 312 259 286 317 265 289 321
SHC — 161 123 — 173 130 — 186 138 244 197 145 262 213 157
kW — 21.5 22.4 — 22.0 22.7 — 22.0 22.9 21.1 22.2 23.1 21.7 22.1 23.3
95
TC — 253 286 — 261 290 — 269 296 244 271 301 250 275 307
SHC — 149 111 — 161 117 — 173 124 231 184 131 246 199 140
kW — 23.1 24.9 — 23.6 24.5 — 24.2 24.9 23.1 24.2 25.2 23.4 24.5 25.4
105
TC — 240 266 — 247 273 — 249 277 229 254 280 234 256 285
SHC — 136 97 — 148 103 — 158 111 217 169 115 231 182 122
kW — 25.1 26.0 — 25.6 26.6 — 25.3 26.5 25.0 25.7 26.5 25.1 25.7 26.7
115
TC — 222 248 — 228 253 210 232 257 213 233 263 215 239 265
SHC — 122 82 — 133 88 188 144 94 201 153 100 212 166 107
kW — 26.8 27.8 — 27.0 28.1 26.6 27.4 28.1 26.7 27.3 28.8 26.7 27.9 28.7
121
TC — 212 — — 218 — 197 221 — 201 224 — 203 225 —
SHC — 113 — — 124 — 177 134 — 190 143 — 201 156 —
kW — 28.2 — — 28.5 — 27.7 28.6 — 27.9 28.9 — 28.0 28.9 —
125
TC — — — — — — — — — — — — — — —
SHC — — — — — — — — — — — — — — —
kW — — — — — — — — — — — — — — —
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
.05 1.04 2.07 3.11 4.14 5.18
Use formula
shown below.
.10 .98 1.96 2.94 3.92 4.90
.20 .87 1.74 2.62 3.49 4.36
.30 .76 1.53 2.29 3.05 3.82
0
T
F
Q
0
04
-0
12
55
9F1
80-
30
0