Document 377KmVZmoo4xZrgdMXz4k2B7a

Heating Ventilating Air Conditioning Guide 1939 Boiling Point of Water. The boiling point of water varies with the pressure; it is lower at higher altitudes. A change in pressure will always be accompanied by a change in the boiling point, and there will be a cor responding change in. the latent heat of evaporation. These values are given in Table 8. Specific Heat. The specific heat of water, or the amount of heat (Btu) required to raise the temperature of one pound of water one degree Fahren heit, varies with the temperature, but it is commonly assumed to be Table 7. Thermal Properties of Water Tempebaturs Deo F 32 40 50 60 70 80 90 100 110 120 130 140. ISO 160 170 180 190 200 210 212 220 240 260 280 300 350 400 450 500 550 600 700 Sat. Press. Lb per Sq In. 0.0887 0.1217 0.1780 0.2561 0.3628 0.5067 0.6980 0.9487 1.274 1.692 2.221 2.887 3.716 4.739 5.990 7.510 9.336 11.525 14.123 14.696 17.188 24.97 35.43 49.20 67.01 134.62 247.25 422.61 681.09 1045.4 1544.6 3096.4 Volume Cu Ft psb Lb 0.01602 0.01602 0.01602 0.01603 0.01605 0.01607 0.01610 0.01613 0.01616 0.01620 0.01625 0.01629 0.01634 0.01639 0.01645 0.01650 0 01656 0.01663 0.01669 0.01670 0.01676 0.01690 0.01706 0.01723 0.01742 0.01797 . 0.01865 0.01950 0.02050 . 0.02190 0.02410 0:03940 ' . Weight Lb per Cu Ft 62.42 62.42 62.42 62.38 62.31 62.23 62.11 62.00 61.88 61.73 61.54 61.39 61.20 61.01 60.79 60.61 60.39 60.13 59.92 59.88 59.66 59.17 58.62 58.04 57.41 55.65 53.62 51.30 48.80 45.70 41.50 25.40 Specific Heat 1.0093 1.0048 1.0015 0.9995 0.9982 0.9975 0.9971 0.9970 0.9971 0.9974' 0.9978 0.9984 0.9990 0.9998 1.0007 1.0017 1.0028 1.0039 1.0052 1.0055 1.0068 1.0104 1.0148 1.0200 1.0260 1.0440 1.0670 1.0950 1.1300 1.2000 1.3620 unity at all temperatures. Steam tables are based on exact values, however. The specific heat of ice at 32 F is 0.492 Btu per pound. The amount of heat required to raise one pound of water at 32 F through a known temperature interval depends on the average specific heat for the temperature range. . Sensible and. Latent Heat. The heat necessary to raise the temperature of one pound of water from 32 F to the boiling point is known as the heat of the.liquid or sensible heati When more heat is added, the water begins to evaporate and expand at constant temperature until the water, is entirely changed into steam. The hfeat thus added is known as the latent heat of evaporation. 28 Chapter 1. Air, Water and Steam Table 8. Properties of Saturated Steam: Pressure Table* Abs. Press. In. He. P Temp F t Specific Volume Sat. Liquid Vf Sat. Vapor y Enthalpy Entropy Sat. Liquid hf Evap. hfg Sat. Sat. Vapor Liquid h* Sf Evap. Sfg Sat. Vapor St nua. Press. In. He. P 0.25 0.50 0.75 1.00 1.5 40.23 58.80 70.43 79.03 91.72 0.01602 0.01604 0.01606 0.02608 0.01611 2423.7 1256.4 856.1 652.3 444.9 8.28 26.86 38.47 47.05 59.71 1071.1 1060.6 1054.0 1049.2 1042.0 1079.4 1087.5 1092.5 1096.3 1101.7 0.0166 0.0532 0.0754 0.0914 0.1147 2.1423 2.0453 1.9881 1.9473 1.8894 2.0986 2.0635 2.0387 2.0041 0.50 0.75 1.00 1.5 2 4 6 8 10 101.14 125.43 140.78 152.24 161.49 0.01614 339.2 0.01622 176.7 0.01630 120.72 0.01635 92.16 0.01640 74.76 69.10 93.34 108.67 120.13 129.38 1036.6 I 1105.7 I 0.1316 1022.7 1116.0 0.1738 1013.6 1122.3 0.1996 1006.9 1127.0 0.2186 1001.4 1130.8 0.2335 1.8481 1.7476 1.6881 1.6454 1.6121 1.9797 1.9214 1.8877 1.8640 1.8456 2.0 4.0 6 8 10 12 169.28 0.01644 14 176.05 0.01648 16 1S2.05 0.01652 18 187.45 0:01655 20 192.37 0.02658 63.03 54.55 48.14 43.11 39.07 137.18 143.96 149.98 i 155.39 160,33 996.7 1133.9 992.6 1136.6 988.9 U3S.9 985.7 1141.1 982.7 I 1143.0 0.2460 0.2568 0.2662 0.2746 0.2822 1.5847 1.5613 1.5410 1.5231 1.5069 1.8307 1.8181 1.8072 1.7977 , 1.7891 I 12 14 16 18 20 22 196.90 0.01661 24 201.09 0.01664 26 205.00 0.01667 28 208.67 0.01669 30 212.13 0.01672 Lb 35.73 32.94 30.56 28.52 26.74 164.87 169.09 173.02 176.72 180.19 979.8 977.2 974.8 972.5 970.3 1144.7 1146.3 1147.8 1149.2 1150.5 0.2891 0.2955 0.3014 0.3069 0.3122 1.4923 1.4789 1.4665 1.4550 1.4442 17814 1.7744 1.7679 1.7619 1.7564 22 24 26 28 30 Sq In. Lb 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 26.80 180.07 0.01674 - 24.75 184.42 0.01679 0.01683 0.01687 22.17 190.56 20.089 196.16 18.375 201,33 0.01691 16.938 206.14 0.01694 15.715 210.62 0.01698 14.663 214.83 970.3 967.6 963.6 960.1 956.8 953.7 950.7 947.9 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 1.7566 1.7497 1.7403 1.7319 1.7242 1.7172 1.7108 1.7048 Sq In. 14.696 16 18 20 22 24 26 28 30 250.33 0.01701 32 254.05 0.01704 34 257.58 0.01707 260.95 0.01709 38 264.16 0.01712 13.746 12.940 12.226 11.588 11.015 218.82 222.59 226.18 229.60 232.89 945.3 942.8 940.3 938.0 935.8 1164.1 1165.4 1106.5 1167.6 1168.7 0.3680 0.3733 0.3783 0.3831 0.3876 1.3313 1.3200 1.3110 1.3017 1.2929 1.6993 1.6941 1.6893 1.6848 1.6805 30 32 34 36 38 40 42 267.25 0.01715 270.21 0.01717 44 46 273.05 0.01720 275.80 0.01722 48 278.45 0.01725 10.498 10.029 9.601 9.209 8.848 236.03 239.04 241.95 244.75 247.47 933.7 931.6 929.6 927.7 925.8 1169.7 1170.7 1171.0 1172.4 1173.3 0.3919 0.3960 0.4000 0.4038 0.4075 1.2844 1.2764 1.2687 1.2613 1.2542 1.6763 1.6724 1.6687 1.6652 1.6617 40 42 44 46 48 50 52 54 56 58 281.01 283.49 285.90 288.23 290.50 0.01727 0.01729 0.01731 0.01733 0.01730 60 62 64 66 68 292.71 294.85 296,94 298.99 300.98 0.01738 0.01740 0.01742 0.01744 0.01746 70 72 74 76 78 302.92 304.83 306.68 308.50 310.29 0.01748 0.01750 0.01752 0.01754 0.01755 su 82 84 86 88 312.03 313.74 315.42 317.07 318.68 0.01757 0.01759 0.01761 0.01762 0.01764 90 92 94 96 98 320.27 321.83 323.30 324.87 326.35 0.01766 0.01768 0.01769 0.01771 0.01772 8.515 8.208 7.922 7.656 7.407 250.09 252.63 255.09 257.50 259.82 6.957 6.752 6.560 6.378 262.09 26430 266.45 268.55 270.60 6.206 6.044 5.890 5.743 5.604 272.61 274.57 276.49 278.37 280.21 5.472 5.346 5.226 5.111 [ 282.02 1 283.79 285.53 287.24 288.91 4.896 4.796 4.699 4.606 4.517 290.56 292.18 293.78 296.34 296.89 924.0 922.2 920.5 918.8 917.1 1174.1 1174.8 1175.6 1176.3 2170.9 0.4110 0.4144 0.4177 0.4209 0.4240 1.2474 1.2409 1.2346 1.2285 1.2226 1.6585 1.6553 1.6523 1.6494 1.6466 915.5 1177.0 913.9 .1178.2 912.3 1178.8 910.8 1179.4 909.4 `1180.0 0.4270 0.4300 0.4328 0.4356 0.4383 1.2168 1.2112 1.2059 1.2006 1.1955 1.6438 1.6412 1.6387 1.6362 1.6338 907.9 906.5 905.1 903.7 902.4 1180.6 1181.1 1181.6 1282.1 1182.6 0.4409 0.4435 0.4460 0.4484 0.4508 1.1857 1.1810 1.1764 1.1720 1.6315 1.6292 1.6270 1.6248 1.6228 901.1 899.7 898.5 897.2 895.9 1183.1 .1183.5 1184.0 1184.4 1184.8 0.4531 0.4554 0.4576 0.4598 0.4620 1.1676 1.1633 1.1592 1.1551 1.1510 1.6207 1.6187 1.6168 1.6149 1.6130 894.7 1185.3 893.5 1185.7 892.3 , 1186.1 891.1 1186.4 $89.9 1186.8 0.4641 1.1471 0.4661 1.1433 0.4682 , 1.1394 0.4702 1.1358 0.4721 1.1322 1.6112 1.6094 1.6076 1.6060 1.6043 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96. 98 PUbh& b^Jota Tha^dynamic Properties of Steam, by J. H. Keenan and F. G. Keyes. 29