Document 3N8VNjb49B9DqEamwv2x76dma

48 CHAPTER 3 1948. Guide Table 3. Properties of Saturated Steam: Pressure Table1 Abs. Press. In. Hg P 0.25 0.50 0.75 1.00 1.5 2 4. 6 8 10 Temp F t 40.23 58.80 70.43 79.03 91.72 101.14 125.43 140.78 152.24 161.49 Specific Volume Sat. Liquid IT Sat. Vapor . p 0.01602 0.01604 ,0.01606 0.01608 0.01611 0.01614 0.01622 0.01630 0.01635 . 0.01640 2423.7 1256.4 856.1 652.3 444.9 339.2 176.7 120.72 92.16 74.76 121 169.28 0.01644 63.03 14- 176.05 0.01648 54.55 .16 182.05 0.01652 48.14 18 187.45 0.01655 43.11 20 192.37 0.01658 39.07 22 196.90 0.01661 35.73 24. 201.09 0.01664 32.94 26: 205.00 0.01667 30.56 28 208.67 0.01669 28.52 30 212.13 0.01672 26.74 Lb/Sq In. 14.696 16 18 20 22 24 26 28 212.00 216.32 222.41 .227.96 233.07 237.82 242.25. 246.41 0.01672 _ 0.01674 0.01679 0.01683 0.01687 0.01691 . 0.01694 0.01698 26.80 24.75 22.17 20.089 18.375 16.938 15.715 14.663 30 250.33 0.01701 ' 13.746 32 254.05 0.01704 12.940 34 257.58 0.01707 12.226 36 260.95 0.01709 11.588 38 ,264.16 0.01712 11.015 40 267.25 0.01715 10.498 42 270.21 0.01717 10.029 44 273.05 - 0.01720 9.601 46 275.80 0.01722 9.209 48 278.45 0.01725 .8.848 ' 50 52 54 56 58 60 62 64 66 68 281.01 283.49 285.90 288.23. 290.50 292.71 294.85296.94 298.99 300.98 0.01727 0.01729 0.01731 0.01733 . 0.01736 0.01738 0.01740 0.01742 0.01744 0.01746 8.515 8.208 7.922 7.656 7.407 . 7.175 6.957 6.752 6.560 6.378 70 72 74 76 78 80 82 84 86 '88 - 302.92 0.01748 304.83 0.01750 306.68 0.01752 308.50 . 0.01754 310.29 0.01755 312.03 0.01757 313.74 0.01759 315.42 0.01761 317.07 0.01762 318.68 0.01764 6.206 6.044 5.890 5.743 . 5.604 5.472 5.346 5.226 5.111 5.001 90 92 94 96 98 100 150 200 300 400 . 500 320.27 321.83 323.36 324.87 326.35 327.81 358.42 381.79 417.33 444.59 467.01 0.01766 0.01768 0.01769 0.01771 0.01772 0.01774 0.01809 0.01839 0.01890 0.0193 0.0197 4.896 4.796 4.699 4.606 4.517 4.432 3.015 2.288 1.5433 1.1613 0.9278 Enthalpy Sat. Liquid Af Evap. Afg Sat. Vapor Ag Entropy Sat. Liquid St Evap. Sfg .Sat. Vapor S* Abs. . Press. In. Hg .P 8.28 26.86 38.47 47.05 59.71 69.10 93.34 108.67 120.13 129.38 1071.1 1060.6 1054.0 1049.2 1042.0 1036.6 1022.7 1013.6 1006.9 1001.4 1079.4 1087.5 1092.5 1096.3 1101.7 1105.7 1116.0 1122.3 1127.0 1130.8 0.0166 0.0532 0.0754 0.0914 0.1147 0.1316 0.1738 0.1996 0.2186 0.2335 2.1423 2.0453 1.9881 1.9473 1.8894 1.8481 1.7476 1.6881 1.6454 1.6121 2.1589 2.0985 2.0635 2.0387 2.0041 1.9797 1.9214 1.8877 1.8640 1.8456 0J25 ; 0.50 0.75 1.00 1.5 2 4 6 .8 . 10 137.18 143.96 149.98 155.39 160.33 164.87 169.09 173.02 176.72 180.19 996.7 992.6 988.9 985.7 982.7 979.8 977.2 974.8 972.5 970.3 1133.9 1136.6 1138.9 1141.1 1143.0 1144.7 1146.3 1147.8 1149.2 1150.5 0.2460 0.2568 0.2662 0.2746 0.2822 0.2891 0.2955 0.3014 0.3069 0.3122 1.5847 1.5613 1.5410 1.5231 1.5069 1.4923 1.4789 1.4665 1.4550 1.4442 1.8307 1.8181 1.8072 1.7977 1.7891 1.7814 1.7744 1.7679 1.7619 1.7564 12 14 16 18 20 22 . 24 26 28 .30 180.07 .184.42 190.56 196.16 201.33 206.14 210.62 214.83 970.3 967.6 963.6 960.1 956.8 953.7 950.7 947.9 1150.4 1152.0 1154.2 1156.3 1158.1 1159.8 1161.3 1162.7 0.3120 0.3184 0.3275 0.3356 0.3431 0.3500 0.3564 0.3623 1.4446 1.4313 1.4128 1.3962 1.3811 1.3672 1.3544 1.3425 Lb/Sq In. 1.7566 14.696 1.7497 16 1.7403 18 1.7319 . 20 1.7242 22 1.7172 24 1.7108 26, 1.7048 28 218.82 222.59 226.18 229.60 232.89 236.03 239.04 241.95 244.75 247.47 945.3 942.8 940.3 938.0 935.8 933.7 931.6 929.6 927.7 925.8 1164.1 1165.4 1166.5 1167.6 1168.7 1169.7 1170.7 1171.6 1172.4 1173.3 0.3680 0.3733 0.3783 0.3831 0.3876 0.3919 0.3960 0.4000 0.4038 0.4075 1.3313 1.3209 1.3110 1.3017 1.2929 1.2844 1.2764 1.2687 1.2613 1.2542 1.6993 1.6941 1.6893 1.6848 1.6805 1.6763 1.6724 1.6687 1.6652 1.6617 30 32 34 , 36 38 40 42 44 46 48 250.09 252.63. 255.09 257.50 259.82 262.09 264.30 266.45 268.55 270.60 924.0 922.2 920.5 918.8 917.1 915.5 913.9 912.3 910.8 909.4 1174.1 1174.8 1175.6 1176.3 1176.9 1177.6 1178.2 1178.8 1179.4 1180.0 0.4110 0.4144 0.4177 0.4209 0.4240 0.4270 0.4300 0.4328 0.4356 0.4383 1.2474 1.2409 1.2346 1.2285 1.2226 1.2168 1.2112 1.2059 1.2006 1.1955 1.6585 1.6553 1.6523 1.6494 1.6466 1.6438 1.6412 1.6387 1.6362 1.6338 50 52 54 56 58 60 62 64 66 68 272.61 274.57 276.49 278.37 280.21 282.02 283.79 285.53 287.24 288.91 907.9 906.5 905.1 903.7 902.4 901.1 899.7 898.5 897.2 895.9 1180.6 1181.1 1181.6 1182.1 1182.6 1183.1 1183.5 1184.0 1184.4 1184.8 0.4409 0.4435 0.4460 0.4484 0.4508 0.4531 0.4554 0.4576 0.4598 0.4620 1.1906 1.6315 1.1857 . 1.6292 1.1810 1.6270 1.1764 1.6248 1.1720 1.6228 1.1676 1.6207 1.1633 1.6187 1.1592 1.6168 1.1551 1.6149 1.1510 1.6130 ' 70 72 74* 76 78 80 82 84 86 88 290.56 292.18 293.78 295.34 296.89 298.40 330.51 355.36 393.84 424.0 449.4 894.7 893.5 892.3 891.1 889.9 888.8 863.6 843.0 809.0 780.5 755.0 1185.3 1185.7 1186.1 1186.4 1186.8 1187.2 1194.1 1198.4 1202.8 1204.5 1204.4 0.4641 0.4661 0.4682 0.4702 0.4721 0.4740 0.5138 0.5435 0.5879 0.6214 0.6487 1.1471 1.1433 1.1394 1.1358 1.1322 1.1286 1.0556 1.0018 0.9225 0.8630 0.8147 1.6112 1.6094 1.6076 1.6060 1.6043 1.6026 1.5694 1.5453 1.5104 1.4844 1.4634 90 92 94 96 98 100 150 200 300 400 500 Reprinted by permission from Thermodynamic Properties of Steam, by J. H. Keenan and F. G. Keyes publisbed by John Wiley and Sons, Inc., 1936 edition. Thermodynamics 49 necessary to add a correction term h as follows, h= -- tOB . . 1 + aWs (i (5a) In Table 4 are listed, values of the coefficient B and maximum values of the correction term h, the latter occurring at the same values of (i as. do those of the correction term si. Unfortunately, values of the entropy 5 of moist air per pound of dry air computed from the simple relation, s = fa + |Uas . (6) do not approximate the true values as closely as might be desired except at temperatures considerably lower than 150 F. Only a relatively small portion of the error is contributed by the correction term ; _ n(l -- tQC 1 + aWs H (5a) Table 4 lists values of the coefficient C and maximum .values of the correction term s, the latter occurring at the same values qf (j. as do those, of the correction terms si and h. The larger portion of the error is con tributed by the so-called mixing entropy; It can be expressed as an additional correction term 5 as follows, 1 = 0.1579 1(1 + tut fVB) logio(1 + yaWs) -- (talEs login (|i) - |x(l + aH^log,o(l + aWe)\ ^ Maximum values of s and the values of |x at which'they occur are given in Table 4. In Equation 6b logio denotes logarithm to the base 10- MOLLEER DIAGRAM It is a fundamental proposition of thermodynamics that when a fluid, flows across a section fixed in space it convects with it an -amount of energy equal to its enthalpy as determined by the pressure, temperature, and com position of the fluid at that section. This fundamental proposition provides the correct procedure for applying the law of conservation of energy to Table 4. Coefficients A, B, C Appearing in Equations 4a, 5a, 6a, MaximumValues of Corrections Defined by Equations 4a, 5a, 6a. Degree of Saturation at. Which These Maxima Occur, iim. Maximum Value of Correction Defined' by Equation 6b. Degree of Saturation at Which This Maximum Occurs; fm. ' (Standard Atmospheric Pressure) t (F) AB (flVlba) (Btu/lba) c (Btu/F/ Iba) Pou (flVlba) (Btu/lba) . (Btu/F/ lba) jmax (Btu/F/ ' lba) ' 96 0.0018 112 0.0042 128 0.0096 144' 0.0215 160 0.0487 176 0.1169 192 0.3363 0.0286 0.0650 0.1439 0.3149 0.6969 1.636 4.608 .0.00004 0.00009 0.00020 0.00042 0.00091 0.00207 0.00567 00004 0.0010 0.0022 0.0047 0.0099 0.0207 0.045i 0.0069 0.0155 0.0332 0;0693 0.1418 0.2903 0.6180 0.00001 0.4925 0.00002 ,0.4878 0.00005, 0.4805 0.00009 0.4691 0.00019 0.4511 0.00037 0.4213 o;boo76 0.3662 0.0015 0.0025 0.0040 0.0065 0.0106 0.0179 0.0333 l'- i " 0.3650 0.3632. 0.3602 0:3557 0.3485 0.3363 0.3129