Chromalox Propiedades del aire

Información Técnica
Chromalox Technical Documents
Datos de referencia
Propiedades del aire
Calor específico, viscosidad y densidad (peso) del aire a diferentes temperaturas y presiones
Temp Calor Viscosidad
del específ- absoluta
Aire ico (Btu/ (Lbs/
(°F) Lbs/°F) Ft/Hr)
-20
-10
0
10
20
30
40
50
60
70
80
90
100
120
150
175
200
250
300
350
400
500
600
700
800
900
1000
0.239
0.239
0.239
0.239
0.239
0.240
0.240
0.240
0.240
0.240
0.240
0.240
0.240
0.240
0.241
0.241
0.241
0.242
0.243
0.244
0.245
0.248
0.25
0.254
0.257
0.259
0.262
0.039
0.039
0.040
0.040
0.041
0.041
0.042
0.042
0.043
0.044
0.045
0.045
0.046
0.047
0.049
0.051
0.052
0.055
0.058
0.060
0.063
0.067
0.072
0.076
0.080
0.085
0.089
Presión indicada en lbs/plg2 (basado en presión atmosférica absoluta de 14.7 lbs/plg2 al nivel del mar)
0
10
20
0.0900
0.0882
0.0864
0.0846
0.0828
0.0811
0.0795
0.0780
0.0764
0.0750
0.0736
0.0723
0.0710
0.0686
0.0652
0.0626
0.0603
0.0560
0.0523
0.0491
0.0463
0.0414
0.0376
0.0341
0.0314
0.0295
0.0275
0.152
0.149
0.146
0.143
0.140
0.137
0.134
0.131
0.128
0.126
0.124
0.122
0.120
0.116
0.110
0.105
0.101
0.094
0.088
0.083
0.078
0.067
0.063
0.058
0.053
0.049
0.046
0.213
0.209
0.204
0.199
0.196
0.192
0.188
0.184
0.180
0.177
0.174
0.171
0.168
0.162
0.154
0.148
0.143
0.132
0.124
0.116
0.109
0.098
0.089
0.081
0.071
0.069
0.064
La densidad a presión y temperatura específicas
puede convertirse en otra densidad a otra presión y
temperatura usando la siguiente ecuación:
T1 P2
D2 = D1 T x P
2
1
Donde:
T1 = Temperatura en condición inicial ( °F + 460°)
T2 = Temperatura en condición nueva ( °F + 460°)
D1 = Densidad en lbs/pie3 en condición inicial
D2 = Densidad en lbs/pie3 en condición nueva
P1 = Presión absoluta (psia) en condición inicial
P2 = Presión absoluta (psia) en condición nueva
Cálculo de flujo o volumen
La misma fórmula puede usarse para convertir el
flujo de aire o volumen a la presión indicada (psig)
en condiciones estándares (presión atmosférica a
21 °C [70 °F]) sustituyendo pies cúbicos (pies3) o
pies cúbicos por minuto (CFM) por densidad (D):
I-42
40
50
60
70
80
100
120
150
200
250
300
0.702
0.687
0.672
0.658
0.645
0.632
0.619
0.607
0.596
0.584
0.572
0.561
0.551
0.533
0.508
0.488
0.470
0.436
0.407
0.382
0.360
0.322
0.292
0.267
0.246
0.228
0.212
0.825
0.807
0.790
0.774
0.757
0.742
0.727
0.713
0.700
0.686
0.673
0.660
0.648
0.626
0.596
0.573
0.552
0.513
0.478
0.449
0.423
0.379
0.343
0.328
0.314
0.289
0.268
1.010
0.989
0.968
0.947
0.927
0.908
0.890
0.873
0.856
0.839
0.824
0.809
0.794
0.767
0.730
0.701
0.674
0.627
0.585
0.549
0.517
0.463
0.419
0.383
0.353
0.327
0.304
1.318
1.288
1.260
1.233
1.208
1.184
1.161
1.139
1.116
1.095
1.074
1.054
1.035
1.001
0.953
0.914
0.879
0.817
0.762
0.715
0.674
0.604
0.547
0.500
0.460
0.427
0.397
1.625
1.588
1.553
1.520
1.489
1.460
1.431
1.403
1.376
1.350
1.325
1.300
1.276
1.234
1.175
1.128
1.084
1.007
0.940
0.883
0.831
0.746
0.675
0.616
0.568
0.526
0.490
1.934
1.890
1.850
1.810
1.770
1.730
1.705
1.661
1.638
1.604
1.573
1.546
1.517
1.465
1.392
1.337
1.287
1.197
1.118
1.048
0.987
0.885
0.801
0.733
0.675
0.625
0.582
Densidad (peso) en lbs/pie3
Cálculo de la densidad a otras
temperaturas y presiones
CFM estándar = CFM real
30
(70 + 460)
(T2 +460)
x
(psig + 14.7)
14.7 psia
1-800-443-2640
0.274
0.268
0.263
0.257
0.252
0.247
0.242
0.237
0.232
0.228
0.224
0.220
0.215
0.208
0.199
0.191
0.184
0.171
0.159
0.150
0.140
0.126
0.114
0.104
0.096
0.089
0.083
0.336
0.328
0.322
0.315
0.307
0.302
0.295
0.291
0.284
0.279
0.274
0.269
0.264
0.255
0.243
0.234
0.225
0.208
0.195
0.184
0.172
0.154
0.140
0.127
0.117
0.109
0.101
0.397
0.388
0.380
0.372
0.365
0.357
0.350
0.343
0.336
0.330
0.324
0.318
0.312
0.302
0.287
0.275
0.266
0.247
0.230
0.216
0.203
0.182
0.165
0.151
0.139
0.129
0.120
0.458
0.448
0.438
0.429
0.421
0.412
0.404
0.396
0.388
0.381
0.374
0.367
0.360
0.348
0.331
0.318
0.305
0.285
0.265
0.249
0.235
0.210
0.190
0.174
0.160
0.148
0.138
0.519
0.508
0.497
0.486
0.477
0.467
0.458
0.449
0.440
0.432
0.423
0.415
0.408
0.394
0.375
0.361
0.347
0.322
0.301
0.282
0.266
0.238
0.216
0.198
0.181
0.168
0.157
0.580
0.567
0.556
0.543
0.533
0.522
0.511
0.501
0.493
0.482
0.473
0.464
0.455
0.440
0.419
0.403
0.388
0.360
0.336
0.316
0.298
0.266
0.241
0.221
0.203
0.188
0.175
Contenido de vapor de agua del aire en libras de agua/100 pies3 a diferentes
temperaturas y humedad relativa
lbs/100 pies3 a la humedad relativa especificada
Aire
(°F) 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%
-20 .001
-10 .001
0 .001
10 .002
20 .004
30 .006
40 .008
50 .012
60 .017
65 .020
68 .022
70 .023
71 .024
72 .025
73 .025
74 .026
75 .027
78 .030
80 .032
85 .037
90 .043
95 .049
100 .057
.001
.001
.002
.003
.005
.007
.010
.015
.021
.025
.027
.029
.030
.031
.032
.033
.034
.037
.040
.046
.053
.062
.071
.001
.001
.002
.003
.005
.008
.012
.018
.025
.029
.032
.035
.036
.037
.038
.039
.041
.044
.047
.055
.064
.074
.036
.001
.001
.002
.004
.006
.010
.014
.021
.029
.034
.038
.040
.042
.043
.044
.046
.047
.052
.055
.064
.075
.086
.100
.001
.002
.003
.004
.007
.011
.016
.024
.033
.039
.043
.046
.048
.049
.051
.052
.054
.059
.063
.074
.085
.099
.114
.002
.002
.003
.005
.008
.013
.018
.027
.037
.044
.049
.052
.054
.055
.057
.059
.061
.067
.071
.083
.096
.111
.128
.002
.002
.004
.006
.009
.014
.021
.030
.042
.049
.054
.058
.060
.062
.064
.066
.068
.074
.079
.092
.107
.124
.143
.002
.002
.004
.006
.010
.015
.023
.032
.046
.054
.059
.063
.065
.068
.070
.072
.074
.081
.087
.101
.117
.136
.157
.002
.003
.004
.007
.011
.017
.025
.035
.050
.059
.065
.069
.071
.074
.076
.079
.081
.089
.095
.110
.128
.148
.171
.002
.003
.005
.007
.012
.018
.027
.038
.054
.064
.070
.075
.077
.080
.083
.085
.088
.096
.103
.120
.138
.161
.185
.002
.003
.005
.008
.013
.020
.029
.041
.058
.069
.076
.081
.083
.086
.089
.092
.094
.104
.111
.129
.149
.173
.200
.002
.003
.005
.008
.014
.021
.031
.044
.062
.074
.081
.086
.089
.092
.095
.098
.101
.111
.119
.138
.160
.185
.214
.003
.003
.006
.009
.014
.022
.033
.047
.066
.078
.086
.092
.095
.098
.102
.105
.108
.118
.126
.147
.170
.198
.228
.003
.003
.006
.009
.015
.024
.035
.050
.071
.083
.092
.098
.101
.105
.108
.111
.115
.126
.134
.156
.181
.210
.242
.003
.004
.006
.010
.016
.025
.037
.053
.075
.088
.097
.104
.107
.111
.114
.118
.122
.133
.142
.166
.192
.222
.257
Nota: Para convertir los "granos de humedad" a libras, multiplique los granos por 0.0001428.
www.chromalox.com
.003
.004
.007
.010
.017
.027
.039
.056
.079
.093
.103
.109
.113
.117
.121
.124
.128
.141
.150
.175
.202
.225
.271
.003
.004
.007
.011
.018
.028
.041
.059
.083
.098
.108
.115
.119
.123
.127
.131
.135
.148
.158
.184
.213
.247
.285