Document rBz0wdjpQgQQyKJo6YgYwGxoa
Heating Ventilating Air Conditioning Guide 1938
Temperaturb
Deo F
Table 1. Properties of Dry Air3 Barometric Pressure 29.921 In. of Hg
Weight Pounds
per Cu Ft
Ratio or
Volume to
Volume at 70 F
Btu Absorbed bt
One Ca Ft Drt Air per Deo F
Cu Ft Dry
Air Warmed One Deg per Btu
0 10 20 30 40 50 60 70 80 90 100 . 110 120 130 140 150 ' 160 180 200 220 240 260 280 300 350 400 450 500 550 600 700 800 900 .1000
0.08633
a. 08449
0.08273 0.08104 0.07942 0.07785 0.07636 0.07492 . 0.07353 0.07219 0.07090 0.06966 0.06845 0.06729 0.06617 0.06509 0.06403 0.06203 0.06015 0.05838 0.05671 0.05514 0.05365 0.05223 0.04901 0.04615 0.04362 0.04135 0.03930 0.03744 0.03422 0.03150 0.02911 0.02718'
0.8678 0.8867 0.9056 0.9245 0.9433 0.9624 0.9811 1.0000 1.0189 1.0378 1.0567 1.0755 1,0946 1.1133 1.1322 1.1510 1.1701 1.2078 1.2456 1.2832 1.3211 1.3587 1.3965 1.4344 . 1.5287 1.6234 1.7176 1.8119 1.9064 2.0011 2.1893 2.3784 2.5737 . 2.7564
0.02077 ... 0.02030
0.01986 0.01944 ;; .' 0.01905 0.01868 0.01832 0.01798 0.01765 0.01733 0.01702 0.01672 0.01643 0.01616 0.01589 0.01563 0.01538 0.01490 0.01446 0.01403 0.01364 0.01326 0.01291 0.01257 0.01181 0.01114 0.01054 0.01001 0.00953 0.00908 0.00833 0.00769 0.00713 0.00668
48,15 49.26 50.35 51.44 52.49 53.36 54.44 55.62 56.66 57.70 58.75 59.81 60.86 61.88 62.93 63.98 65.02 67.11 69.24 71.27 73.31 75.41 77.46 79.55 84.67 89.67 94.87 99.01 104.93 110.13 120.05 130.04 140.25 149.70
Compiled by W. H. Severns. based on the instantaneous specific heats of air. The values for the heats and for the cubic feet warmed one degree are for the temperatures stated and are not true over a tempera ture range of more than one degree above or below the temperatures stated.
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Chapter 1. Air. Water and Steam
T^ble 2. Properties of Saturated Air3 Weights of Air, Vapor and Saturated Mixture of Air and Vapor at 29.921 In. of Hg
Temp. Deg F
Weight in a Cubic Foot or Mixture
Weight of Dry Air Pounds
Wright of Vapor Pounds
' Total Weight of Mixture Pounds
Btu Absorbed
bt One
Cubic Foot Sat. Air per Dbg F
Cubic Feet Sat. Air Warmed One Deg
per Btu
Specific Heat Btu
per Pound or
Mixture
0
0.08622
0.000068
0.08629
0.02078
48.12
0.2408
10
0.08431
0.000111
0.08442
0.02031
49.24
0.2406
20
0.08244
0.000177
0.08262
0.01987
50.33
0.2405
30
0.08060
0.000278
0.08088
0.01946
51.39
0.2406
40
0.07876
0.000409
0.07917
0.01908
52.41
0.2410
50
0.07692
0.000587
0.07751
0.01872
53.42
0.2415
60
0.07503
0.000828
0.07586
0.01838
54.41
0.2423
70
0.07307
0.001151
0.07422
0.01805
55.40
0.2432
80
0.07099
0.001578
0.07257
0.0i775
56.34
0.2446
90
0.06877
0.002134
0.07090
0.01747
57.24
0.2464
100
0.06634
0.002851
0.06919
0.01721
58.11
0.2487
110
0.06361- 0.003762
0.06737
0.01696
58.96
0.2517
120
0.06057
0.004912
0.06548
0.01675
59.70
0.2558
130
0.05712
0.006344
0.06346
0.01657
60.35
0.2611
140
0.05317
0.008116
0.06129
0.01642
60.91
0.2679
150
0.04863
0.010284
0.05891
0.01630
61.35
0.2767
160
0.04339
0.012919
0.05631
0.01624
61.58
0.2884
170
0.03733
0.016092
0.05342
0.01621
61.69
0.3034
180
0.03033
0.019888
0.05022
0.01624
61.58
0.3234
190
0.02228
0.024384
0.04666
0.01633
61.24
0.3500
200
0.01298
0.029700
0.04268
0.01649
60.64
0.3864
210
0.00230
0.035932
0.03616
0.01672
59.81
0.4624
212
0.00000
0.037286
0.03729
0.01818
55.01
0.4875
.Compiled by W,H. Severns, based on the instantaneous specific heats of air.
Table 3. Specific Heats of Dry Air3 Constant Barometric Pressure of 29.921 In. of Hg
Temperature
Deo F
Instantaneous ' or True
Specific Heat
Temperature
Range
Deg F
Mean Specific
Heat
-301.0 -108.4
32.0 212,0 392.0 752.0 1112.0
,, 0.2520 0.2430 0.2399 0.2403 0.2413 0.2430 0.2470
32 to 212 32 to 392 32 to 752 32 to 1112
...
--
0.2401 0.2411 0.2420 0.2430
--
Compiled by W. H. Severns, based on data given in the International Critical Tables. 5
'