Bryant 579F User Manual page 248

581A300 (25 TONS) UNIT WITH HOT GAS REHEAT IN COOLING MODE
Temp (F)
7000/0.042
Air Entering
Condenser
(Edb)
57 62 67
TC 245 268 293
75
SHC 245 229 197
kW 16.4 17.0 17.6
TC 233 259 278
85
SHC 233 228 186
kW 17.9 18.7 19.3
TC 230 252 276
95
SHC 230 225 191
kW 20.0 20.8 21.4
TC 226 245 268
105
SHC 226 223 188
kW 22.0 22.8 23.3
TC 221 233 258
115
SHC 221 217 183
kW 24.3 25.1 25.7
TC 216 223 247
125
SHC 216 212 181
kW 26.9 27.1 28.0
581A300 (25 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B OFF
Temp (F)
7500/0.045
Air Entering
Condenser
(Edb)
50 55
TC 79 83
65 SHC 39 33
kW 11 11
TC 56 61
75 SHC 18 11
kW 11 11
TC 34 38
85 SHC –2 –11
kW 11 11
TC 12 16
95 SHC –23 –33
kW 12 12
581A300 (25 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B ON
Temp (F)
7500/0.045
Air Entering
Condenser
(Edb)
50 55
TC 211 222
65 SHC 123 115
kW 19 19
TC 182 193
75 SHC 103 93
kW 20 21
TC 153 164
85 SHC 84 72
kW 22 22
TC 124 135
95 SHC 64 50
kW 23 23
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
t = Wet-bulb temperature corresponding to enthalpy of air leaving evapo-
lwb
rator coil (h )
lwb
total capacity (Btuh)
h = h –
lwb ewb
4.5 x cfm
Where: h = Enthalpy of air entering evaporator coil
ewb
PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH HOT GAS REHEAT OPTION (cont)
8250/0.052
72 57 62 67
318 259 282 303
162 259 254 213
18.2 16.7 17.4 17.9 18.6
309 256 273 293
158 256 252 211
19.9 18.5 19.1 19.7 20.4
303 251 265 284
156 251 249 202
22.1 20.7 21.2 21.5 22.4
292 242 253 277
153 242 241 205
24.3 22.7 23.1 23.7 24.7
281 232 242 267
149 232 230 200
26.7 24.8 25.4 26.1 27.1
268 225 230 253
145 225 223 196
29.0 27.4 27.5 28.3 29.4
8250/0.055
60 50 55
87 80 84
28 41 35
11 11 11
65 57 62
5 20 12
11 11 11
42 35 39
–19 –1 –10
12 11 12
19 13 17
–42 –22 –32
12 12 12
8250/0.055
60 50 55
231 215 226
109 129 121
20 19 19
202 185 196
85 110 100
21 20 21
174 155 166
62 90 78
22 22 22
145 125 136
38 71 57
23 23 23
Air Entering Evaporator — Cfm/BF
9500/0.062
Air Entering Evaporator — Ewb (F)
72 57 62 67 72
333 274 291 314 340
173 274 271 230 183
17.1 17.6 18.2 18.8
324 271 282 305 330
171 271 264 229 180
19.0 19.4 20.0 20.8
314 269 274 290 326
166 269 269 220 181
21.3 21.4 21.9 23.0
301 255 264 284 308
163 255 255 221 171
23.1 23.4 24.0 25.0
290 247 253 274 297
160 247 246 217 170
25.3 25.8 26.4 27.2
275 237 240 256 280
155 237 236 211 163
27.8 27.9 28.5 29.6
Evaporator Air Quantity — Cfm/BF
9500/0.065
Evaporator Air — Relative Humidity (%)
60 50 55 60
88 81 85 89
30 43 37 32
11 11 11 11
66 59 63 67
6 22 15 8
11 11 11 11
43 37 41 45
–18 1 –8 –16
12 12 12 12
21 15 19 22
–41 –20 –31 –40
12 12 12 12
Evaporator Air Quantity — Cfm/BF
9500/0.065
Evaporator Air — Relative Humidity (%)
60 50 55 60
235 220 232 241
115 139 131 124
20 19 19 20
205 189 200 210
91 120 110 101
21 21 21 21
176 157 169 178
68 100 88 78
22 22 22 22
146 125 137 147
45 81 67 55
23 23 23 24
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)
.05
.10
.20
.30
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
248
10,750/0.072
57 62 67 72 57
289 301 322 348 305
289 287 247 195 305
17.5 17.8 18.4 19.0 18.0
285 290 312 337 298
285 276 246 191 298
19.3 19.6 20.2 21.1 19.8
274 282 300 332 283
274 274 238 190 283
21.5 21.7 22.1 23.2 21.6
266 275 290 314 278
265 265 240 185 278
23.6 23.7 24.3 25.2 24.0
253 260 275 302 267
253 254 233 179 267
25.8 26.0 26.5 27.3 26.1
247 248 260 285 254
247 247 228 174 254
28.2 28.3 28.7 29.8 28.5
10,750/0.075
50 55 60 50
82 86 90 83
45 39 34 47
11 11 11 11
60 64 68 61
24 16 10 26
11 11 11 11
38 42 46 39
3 –7 –14 4
12 12 12 12
16 20 24 17
–19 –30 –39 –17
12 12 12 12
10,750/0.075
50 55 60 50
226 237 247 230
147 139 133 155
19 20 20 19
192 204 214 196
128 118 110 136
21 21 21 21
159 171 181 161
110 97 87 118
22 22 22 22
126 138 148 127
91 76 64 99
23 23 24 23
ENTERING AIR DRY-BULB TEMP (F)
79 78 77 76 75
81 82 83 84 85
Correction Factor
1.04 2.07 3.11 4.14 5.18
.98 1.96 2.94 3.92 4.90
.87 1.74 2.62 3.49 4.36
.76 1.53 2.29 3.05 3.82
12,000/0.082
62 67 72
309 332 356
298 267 203
18.1 18.6 19.2
303 321 343
295 261 201
19.9 20.4 21.3
293 308 334
280 259 197
22.0 22.5 23.3
281 294 319
278 253 194
24.1 24.4 25.4
269 279 306
267 248 189
26.3 26.7 27.4
255 263 288
254 242 184
28.6 28.9 29.9
12,000/0.085
55 60
87 91
41 36
11 11
65 69
18 12
11 11
43 47
–5 –13
12 12
22 25
–28 –38
12 12
12,000/0.085
55 60
242 252
147 140
20 20
208 218
126 118
21 21
173 184
106 95
22 22
139 149
85 72
24 24
under 75
over 85
Use formula
shown below.