Document zQ20rep0zEj7YrYjGVqEVNy5a

48 CHAPTER 3 1949 Guide Table 3. Properties of Saturated Steam : Pressure Table* Abs. In. Hg 0.25 0.50 0.75 1.00 1.5 .2 4. 6 8' 10 F 1 40.23 58.80 70.43 79.03 91.72 101.14 125.43 140.78 152.24. 161.49 Specific Volume Sat. Liquid *T Sat Vapor *' 0.01602. 0.01604 0.01606 0.01608 0.01611 0.01814 0.01622 0.01630 0.01635 0.01640 2423.7 1256.4 856.1 652.3 444.9 339.2 176.7 . 120.72 02.16 74.76 Enthalpy Entropy Sat. Liquid Evap. Sat. Vapor A. Sat. Liquid St Evap. Sts Sat. Vapor S, Abs. Press. In. Hg P 8.28 1071.1 1079.4 0.0166 2.1423 2.15S9 . 0.25 26.86 1060.6 1087.5 0.0532 2.0453 2.0985 0.50 38.47 1054.0 1092.5 0.0754 1.9831 2.0635 0.75 47.05 1049.2 1096.3 0.0914 1.9473 2.0387 1.00 59.71 1042.0 1101.7 0.1147 1.8894 2.0041 1.5 69.10 1036.6 1105.7 0.1316 1.8481 1.9797 2 93.34 1022.7 1116.0 0.1738 1.7476 1.9214 4 108.67 1013.6 1122.3 0.1996' 1.6881 1.8877 6 120.13 1006.9 1127.0 0.2186 1.6454 1.8640 8 129.33 1001.4 1130.8 0.2335 1.6121 1.8456 10 . 12 169.28 0.01644 141 176.05 0.01648 16 182.05 0.01652 18- 187.45 0.01655 20 192.37 0.01658 22 196.90 - 0.01661 24 201.09 0.01664 26 205.00 0.01667 28, 208.67 0.01669 30: r- -212.13 0.01672 63.03 * 54.55 48.14 43.11 39.07 : 35.73 . 32.94 30.56 28.52 26.74 137.18 143.96 149.98 155.39 160.33 164.87 169.09 173.02 176.72 180.19 996.7 992.6 988.9 985.7 982.7 979.8 977.2 974.8 972.5 970.3 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 23 30 Lb/Sq In.' 14.699* 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 0.01C91 0.01694 0.01698 26.80 . 24.75 22.17 20.089 18.375 . 16.938 15.715. 14.663 180.07 184.42 190.56 196.16 201.33 206.14 210.62 214.83 970.3 967.6 963.6 960.1 956.8 953.7 950.7 947.9 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. i;7566 14.696 1.7497 16 1.7403 18 1.7319 20 1.7242 ' 22 1.7172 ` 24 1.7108 26 1.7048 28 . 30 32. 34 * 36 * 38 40 ' 42'. 44 46; 48; * 250.33 254.05 257.58 260.95 264.16 267.25 270.21 273.05 275.80 278.45 0.01701 0.01704 0.01707 0.01709 0.01712 0.01715 0.01717 0.01720 . 0.01722 0.01725 13.746 12.940 12.226 11.588 11.015 10.498. 10.029 9.601 9.209 8.848 218.82 222.59 226.18 229.60 232.89 238.03 239.04 241.95 244.75 247.47 945.3 942.8 940.3 938.0 935.8 933.7 931.6 929.6 927.7 925.8 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 . 50 *281.01 52- 283.49 54- 285.90 56- 288.23 58.' 290.50 60!' 292.71 62- 294.85 64? 296.94 66; * 298.99 68; > .300.98 0.01727 0.01729 0.01731 0.01733 0.01736 0.01738 0.01740 0.01742 -* 0.01744 0.01748 8.515* 8.203 7.922 7.656 7.407 7.175 6.957 6.752 .6.560 6.378 _' 250.09 252.63 255.09 257.50 259.82 262.09 264.30 266.45 268.55 270.60 924.0 1174.1 922.2 1174.8 920.5 1175.6 918.8 1176.3 917.1 1176.9 915.5 1177.6 913.9 1178.2 912.3 1178.8 910.8 1179.4 909.4 .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* 70* 72! - . 74 761 * 78; 80 82: 84 i . 86- 88 i 302.92 304.83 308.68 308.50 310.29 312.03 313.74 315.42 317.07 318.68 0.01748 6.206 0.01750 6.044 0.01752 . 5.890 0.01754 - 0.01755 - 5.743. 5.604 0.01757 . 0.01759 .5.472 . 5.346 * 0.01761 5.226 0.01762 - 5.111 0.01764 5.001 272.61 907.9 274.57 906.5 276.49 905.1 278.37 903.7 280.21 N 902.4 282.02 901.1 283.79 899.7 285.53 898.5 287.24 897.2 288.91 895.9 1180.6 1181.1 1181.6 1182.1 1182.6 1183.1 1183.5 1184.0 1184.4 1184.8 0.4409 1.1906 0.4435 1.1857 0.4460 1.1810 0.4484 . 1.1764 0.4503 1.1720 0.4531 1.1676 0.4554 1.1633 0.4576 1.1592 0.4598 1.1551 0.4620 1.1510 1.6315 1.6292 72 *;. 1.6270 74. 1.6248 1 76: - 1.6228 78 1.6207 80 1.6187 82' 1.6168 84 . 1.6149 86 1.6130 . 88 90 9294. 99; , 98: 100150: 200! 300 400! 500i 320.27 0.01766 321.83 , 0.01768 323.36 0.01769 ' 324.87- 0.01771 326.35 0.01772 327.81 0.01774 358.42 0.01809 381.79 (X01839 % '417.33 0.01890 ' 444.59 0.0193 ; ' * 467.01 0.0197 4.896 * ` 4.796 4.699' * 4.606 4.517 4.432 3.015 2.288 1.5433 1.1613 0.9278 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 andjSons; Inc..'1936 edition^ i ; '-:1 Thermodynamics '49 p. = saturation pressure of pure water vapor, pounds'per square inch or inches of Hg. Moistiair can be saturated at any given values of temperature and: pressure, though this requires that it have a definite humidity ratio Wi and that the coexisting condensed phase contain a definite, but very small quantity of dissolved air. On the other hand, pure water vapor (steam) cannot be saturated at any given values of tem perature and pressure because its composition is invariable. It can, however, be saturated at any given temperature (below the critical temperature),, though this requires that it have a definite pressure p. and that the coexisting condensed phase have the same temperature and pressure. The values of saturation pressure listed in Table 1 have been computed from the formulas of Goff and Gratch*. Thermodynamic Properties of Water at Saturation Table 2 offers revisions to existing steam table data5,with extension downward to --160 .F. These revisions and extension,were a necessary preliminary to the construction of Table 1. A detailed, explanation of the methods employed in constructing Table 2 is given in a paper2 by John A., Goff and S. Gratch. As in Table 1 the temperature scale used as argument in Table 2 is the Fahrenheit scale defined in terms of absolute temperature T by Equation 1, whereas the Fahrenheit scale used as argument in existing steam tables is that derived from the International Centigrade scale by means of Equation 2. The symbols used as column headings in Table 2 are the same as those used in the steam tables and have the same meanings; therefore, a detailed explanation seems unnecessary. Properties of water above 212 F from Keenan and Keyes* are given in Table 3. DEGREE OF SATURATION At given values of temperature and pressure the humidity ratio W of moist air can have any value between zero (dry air) and IF, (moist air at saturation). For convenience a parameter p called alternatively degree of saturation is introduced through the definition, W = pW. (3) Obviously the degree of saturation p can have any value from zero (diy air) to unity (moist air at saturation). . To a degree of approximation within the estimated uncertainty of the Table 4. Coefficients A, B, C Appearing in Equations 4a, 5a, 6a; Maximum Values of Corrections Defined by Equations 4a, 5a, 6a.. Degree,of, . Saturation at Which These Maxima Occur, pm. Maximum Value of Correction Defined by Equation 6b. Degree of Saturation at Which This Maximum Occurs, JL. (Standard Atmospheric Pressure) / <F) AB (flVlba) (Btu/lba) c (Btu/F/. ib) ?max (ftVlb*) (Btu/lba) *QUUt (Btu/F/' lb.) Um (Btu/F/ lb*> 96 112 0.0018 0.0042 0.0286 0.0650 0.00004 0.00009 0.0004 0.0010 0.0069 0.0155 o.boooi 0.00002 0.4925 0.4878 0.0015 0.0035 0:3650 0.3632 128 0.0096 0.1439 0.00020 0.0022 0.0332 0.00005 0.4805 0.0040 0.3602 144 160 0.0215 0.3149 0.0487 0.6969 0.00042 0.00091 0.0047 0.0693 0.0099 0.1418 0.00009. 0.4691 0.00019 0.4511 0.0065 0.0106 0.3557 0.3485 176 0.1169 1.636 0.00207 0.0207 0.2903 0.00037 0.4213 0.0179 0.3363 192 0.3363 4.608 0.00567 0.0451 0.6180 0.0007C 0.SC02 0:0333 0.3129