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sr American Society of Heating and Ventilating Engineers Guide, 1935 Table 6. Properties of Saturated Water Vapor at Low Temperatures3 Barometer, 29.92 Inches of Mercury TemfebaTURE F Vapor Pressure In. Ho X 10-* -130 -129 -128 -127 -126 -125 -124 -123 -122 -121 -120 -119 -118 -117 -116 -115 ' -114 -113 -112-111 -110 -109 -108 -107 -106 -105 -104 -103 -102 -101 -100 -99 -98 -97 -96 -95 -94 -93 -92 -91 -90 -89 -88 -87 -86 0.276 .306 .338 .373 .411 .455 .499 .542 .604 .669 .735 .805 .892 .989 1.098 1.208 1.317 1.444 1.575 1.728 1.889 2.087 2.292 2.511 2.742 2.983 3.258 3.543 3.872 4.213 4.607 5.018 5.455 5.946 6.470 7.047 7.638 8.316 9.017 9.806 10.64 11.53 12.51 13.53 14.69 Weight of Saturated Vapor per Lb ' Drt Air X 10-* 0.005738 .006362 .007027 .007755 .008545 Btu per Lb of Vapor (32 F Datum) 1000.7 1001.2 1001.6 1002.1 1002.5 .009459 .01037 .01127 .01256 .01391 1003.0 1003.4 1003.9 1004.3 1004.8 .01528 .01674 .01854 .02056 .02283 1005.2 1005.7 1006.1 1006.6 1007.0 .02511 .02738 .03002 .03274 .03593 1007.5 1007.9 1008.4 1008.8 1009.3 .03927 .04339 .04765 .05220 .05701 1009.7 1010.2 1010.6 1011.1 1011.5 .06202 .06773 .07366 .08050 .08759 1012.0 1012.4 1012.9 1013.3 1013.8 .09578 .1043 .1134 .1236 .1345 1014.2 1014.7 1015.1 1015.6 1016.0 .1465 .1588 .1729 .1875 .2039 1016.5 1016.9 1017.4 1017.8 1018.3 .2212 .2397 .2601 .2813 .3054 1018.7 1019.2 1019.6 1020.1 1020.5 Tempera ture F Vapor Pressure In. Ho X I0-* -85 -84 -83 -82 -81 -80 -79 -78 -77 -76 -75 -74 -73 -72 -71 -70 -69 -68 -67 -66 -65 -64 -63 -62 -61 -60 -59 -58 -57 -56 -55 -54 -53 -52 -51 . -50 -49 -48 -47 -46 -45 -44 -43 -42 -41 15.87 17.20 18.58 20.10 21.72 23.47 25.34 27.29 29.52 31.81 34.37 37.01 39.96 43.04 46.33 49.87 53.59 57.65 61.81 66.41 71.17 76.64 82.28 88.19 94.62 101.4 108r8 116.3 124.8 133.4 . 143.0 153.0 163.5 174.9 187.0 199.9 213.0 227.9 243.1 259.5 276.7 295.0 314.7 335.3 357.6 Weight of Saturated Vapor per Lb Drt Air x io* 0.3299 .3576 .3863 .4179 .4516 .4879 .5268 .5674 .6137 .6613 .7146 .7694 .8308 .8948 .9632 1.037 1.114 1.199 1.285 1.381 1.480 1.593 1.711 1.833 1.967 2.108 2.262 2.418 2.595 2,773 2.973 3.181 3.399 3.636 3.888 4.156 4.478 4.738 5.054 5.395 5.753 6.133 6.543 6.971 7.435 Btu per Lb of Vapor (32 F Datum) 1021.0 1021.4 1021.9 1022.3 1022.8 1023.2 1023.7 1024.1 1024.6 1025.0 1025.5 1025.9 1026.4 1026.8 1027.3 1027.7 1028.2 1028.6 1029.1 1029.5 1030.0 1030.4 1030.9 1031.3 1031.8 1032.2 1032.7 1033.1 1033.6 1034.0 1034.5 1034.9 1035.4 1035.8 1036.3 1036.7 1037.2 1037.6 1038.1 1038.5 1039.0 1039.4 1039.9 1040.3 1040.8 Vapor pressures converted from International Critical Tables. 16 Chapter 1--Fundamentals of Heating and Air Conditioning. Table 6. Properties of Saturated Water Vapor at Low Temperatures3 (Con'd.) Barometer, 29.92 Inches of Mercury Tempera* TUBE F Vapor Pressure In. Ho X 10-* -40 -39 -38 -37 -36 380.3 405.5 431.2 459.2 488.4 -35 -34 -33 -32 -31 519.5 552.4 586.5 623.7 661.8 -30 -29 -28 -27 -26 701.0 742.2 791.2 841.0 892.1 -25 -24 -23 -22 -21 946.4 1003. 1064. 1126. 1192. Weight of Saturated Vapor per Lb Drt Air X to* 7.907 8.431 8.965 9.548 10.16 10.80 11.49 12.20 12.97 13.76 14.58 15.43 16.45 17.49 18.55 19.68 20.86 22.13 23.42 24.79 Btu per Lb of Vapor (32 F Datum) 1041.2 1041.7 1042.1 1042.6 1043:0 1043.5 1043.9 1044.4 1044.8 1045.3 1045.7 1046.2 1046.6 1047.1 1047.5 1048.0 1048.4 1048.9 1049.3 1049.8 Tempera ture F Vapor Pressure In. Ho X 10-* -20 -19 -18 -17 -16 1262.0. 1337. 1416. 1496. 1584. Weight of Saturated Vapor per Lb Drt Air X 10* 26.25 27.81 29t45 31.12 32.95 -15 -14 -13 -12 -U 1675. 1772. 1874. 1980. 2093. 34.84 36.86 38.98 41.19 43.54 -10 -9 -8 --7 -6 2210. 2335. 2463. 2502. 2745. 45.98 48.58 51.25 52.06 57.12 -5 2898. -4 3055. -3 , 3222. -2 3397. -1 3580. 60.30 63.57 67.05 70.69 ' 74.50 0 3773. 78.52 Btu per Lb of Vapor (32 F ` Datum) 1050.2 1050.7 1051.1 1051.6 i052.0 1052.5 1052.9 1053.4 1053.8 1054.3 1054.7 1055.2 1055.6 1056.1 1056.5 1057.0 1057.4 1057.9 1058.3 1058.8 .1059.2 Vapor pressures converted from International Critical Tables. W = weight of water vapor mixed with each pound of dry air, pounds. h'tg = latent heat of vaporization at t', Btu per pound. Since this definition holds for any mixture of dry air and water vapor, the total heat of a mixture with a relative humidity of 100 per cent and at a temperature equal to the wet-bulb temperature (/') is . 'S' = epa (/' - 0) + Wt> h'ts (11) By equating Equation 10 to Equation 11, the equation for the adiabatic saturation process, Equation 9a, follows. This demonstrates that the adiabatic saturation process at constant wet-bulb temperature is also a process of constant total heat. In short, the total heat of a mixture of dry air and water vapor is the same for any two states of the mixture at the same wet-bulb temperature. This fact furnishes a convenient means of finding the total heat of an air-vapor mixture in any state. Example 5. Find the total heat of an air-vapor mixture having a dry-bulb tempera ture of 85 F and a wet-bulb temperature of 70 F. Solution. From Table 5, for saturation at the wet-bulb temperature Wt> = 0.01578, and from Equation 11, S' = Cpa (70 - 0) + 0.01578 h'tg = 16.9 + 16.61 = 33.51