Document N2xDxKK3r0Xjaaddygb0QBg88

Heating Ventilating , Air Conditioning Guide 1938 Table 8. Properties of Saturated Steam : Pressure Table--(Concluded) Ah*, Ptms. Lb./Sq. In. P 260.0 260.0 270.0 260.0 290.0 Tmp. D** F. t 400.97 404.43 407.79 411.06 414.24 300.0 320.0 340.0 360.0 980.0 41733 423.29 428.96 43439 . 43939 400.0 420.0 440.0 460.0 480.0 44438 44938 454.01 458.48 462.80 800.0 620.0 640.0 660.0 680.0 466.99 471.05 474.99 47832 48235 600.0 620.0 640.0 660.0 680.0 486.17 489.71 493.16 496.53 499.82 700.0 720.0 740.0 760.0 780.0 503.04 506.19 50938 51230 51537 800.0 820.0 840.0 860.0 880.0 518.18 521.03 52333 526.58 52939 900.0 920.0 940.0 960.0. 980.0 531.95 S34.56 S37.13 539.66 542.14 1000.0 1060.0 1100.0 1160.0 1200.0 54438 55033 55638 56131 567.14 1260.0 1300.0 1360.0 1400.0 1450.0 57230 57732 58232 586.96 59138 1600.0 1600.0 1700.0 1800.0 1900.0 596.08 604.74 612.98 62036 62839 2000.0 2200.0 2400.0 2600.0 2800.0 635.6 6493 661.9 6733 684.9 3000.0 3200.0 3226.0 6953 704.9 706.1 Specific Volume Sat. Sat* Liquid Evap. Vapor - vi vi* v* 0.01867 1.8223 13410 0.01872 1.7536 1.7723 0.01877 1.6895 1.7083 0.01882 1.6302 1.6490 0.01887 1.5745 1.5934 Total Heat Sat. Sat. Liquid Evap. Vapor hr hr* h* 376.02 8243 1200.5 379.78 8213 1201.0 383.44 8183 1201.4 387.02 814.7 1201.8 390JO 811.6 1202.1 0.01892 1.5225 1.5414 0.01901 1.4279 1.4469 0.01910 13439 13630 0.01918 13689 13881 0.01927 13015 13208 393.90 808.5 1202.4 400.47 8023 1203.0 406.75 796.6 1203.4 412.80 790.9 1203.7 418.61 7853 1203.9 00194 0.0194 0.0195 0.0196 0.0197 1.1407 1.1601 1.0853 1.1047 1334S 10540 0.9881 10077 0.9456 0.9633 4243 429.6 4343 439.9 444.9 779.8 1204.1 7743 1204.1 7693 1204.1 764.1 12043 7593 1203.9 0.0198 0.0198 0.0199 0.0200 0.0201 0.9063 0.9261 0.8701 0.8899 0.8363 00562 00047 0.8247 0.7751 0.7952 449.7 754.0 1203.7 454.4 749.0 12033 4593 744.1 12033 463.6 7393 1202.9 468.0 . 734.S 1202.5 0.0202 0.0202 0.0203 0.0204 0.0205 0.7475 0.7677 0.7217 0.7419 0.6972 0.7175 0.6744 0.6948 0.6527 0.6732 4723 476.6 4803 484.9 488.9 7293 1202.1 725.1 1201.7 7203 12013 715.9 12003 7113 12003 0.0206 0.0206 0.0207 0.0208 0.0209 0.6321 0.6527 0.6128 0.6334 0.5944 0.6151 0.5769 0.5977 0.5602 0.5811 492.9 496.8 500.6 504.4 5083 7063 1199.7 702.4 11993 697.9 1198.6 6933 1198.0 6893 1197.4 0.0209 0.0210 0.0211 0.0212 0.0213 03444 03653 0.5293 03503 03149 03360 0.5013 0.5225 0.4881 0.5094 5113 5153 5193 522.6 526.0 684.9 1196.7 680.6 11963 676.4 1195.4 672.1 1194.7 667.9 1194.0 0.0213 0.0214 0.0215 0.0216 0.0217 0.47S6 0.4969 0.4635 0.4849 0.4520 0.4735 0.4409 0.4625 0.4303 0.4520 5293 532.9 536.2 539.6 5423 6633 11933 659.7 1192.6* 655.6 11913 6513 1191.1 6473 11903 0.0217 0.0219 0.0222 0.0224 0.0226 0.4202 0.4419 03960 0.4179 03738 03960 03540 03764 033S6 03582 546.0 5543 561.7 5693 5763 6433 1189.6 633.6 11873 623.9 1185.6 6143 11833 604.9 1181.4 0.0228 0.0230 0.0232 0.0235 0.0237 03187 03415 03029 03259 0.2884 03216 03748 03983 03621 03858 583.6 590.6 5973 6043 6113 595.6^-1179.2 5863 11773 5773 1174.7 568.1 1172.4 559.1 11703 0.0239 0.0244 0.0249 0.0254 0.0260 0.2502 03741 03284 03528 03089 03338 0.1913 03167 0.1754 03014 6173 5503 1167.6 6303 532.6 1162.7 6423 515.0 11573 654.7 4973 11513 6663 478.9 1145.7 0.0265 0.1610 0.1875 0.0277 0.1346 0.1623 0.0292 0.1112 0.1404 0.0310 0.0895 0.1205 0.0333 . 0.0688 0.1021 6793 703.7 729.4 756.7 786.7 460.0 11393 420.0 1123.8 376.4 11053 3273 1084.5 2723 1058.9 0.0367 , 0.0477 -0.0844 : 823.1 202.5 1025.6 0.C4S9 0.0142 0.0601 8873 75.9 962.9 0.0522 0 0.0522 925.0 0 925.0 Entropy Sat. Sat. Liquid Evap. Vapor Sf 8fg Sg 0.5680 0.9581 1.5261 0.5723 0.9504 1.5227 0.5765 0.9430 1.5194 03805 0.93S7 13163 03845 0.9287 13132 P 260.0 260.0 270.0 280.0 290.0 03883 0.9220. 13102 0.5957 0.9089 1.5046 0.6027 03965 1.4992 0.6094 0.8846- 1.4940 031S7 0.8733 1.4891 300.0 820.0 340.0 360.0 380.0 0.6218 0.8625 1.4843 0.6277 03520 1.4798 0.6334 0.8420 1.4753 0.6388 0.8322 1/4711 0.6441 0.8228 1.4670 iooio 420.0 440.0 460:0 480.0 0.6493 03137 1.4630 0.6543 0.8048 1.4591 0.6S92 0.7962 1.4SS4 0.6639 0.7878 1.4517 0.6686 0.7796 1.4482 600.0 620.0 640.0 600.0 680.0 0.6731 0.7716 1.4447 0.6775 0.7638 1.4413 0.6818 0.7562 1.4380 0.6861 0.7487 1.4348 0.6902 0.7414 1.4316 600.0 620.0 640.0 660.0 680.0 0.6943 0.7342 1.428$ 0.6983 0.7272 1.4255 0.7022 0.7203 1.4225 0.7060 0.7136 1.4196 0.7098 0.7069 1.4167 700.0 720.0 740.0 760.0 780.0 0.7135 0.7004 1.4139 0.7171 0.6940 1.4111 0.7207 0.6877 1.4084 0.7242 0.6815 1.4057 0.7277 0.6754 1.4031 800.0 620.0 840.0 860.0 880.0 0.7311 03694 1.400$ 0.7344 0.6635 13980 0.7377 0.6577 13954 0.7410 0.6520 13930 0.7442 0.6464 13905 900.0 920.0 940.0 960.0 980.0 0.7473 0.6408 13881 0.7550 0.6273 13822 0.7624 0.6141 13765 0.7695 0.6014 13709 0.7764 0.5891 13656 1000.0 1050.0 1100.0 1160.0 1200.0 0.7831 0.5772 13603 0.7897 03654 13S52 0.7962 03540 13501 0.8024 03428 13452 03086 0.5318 13404 1260.0 1300.0 1360.0 1400.0 1460.0 0.8146 03212 13357 03262 0.5003 23265 0.8373 0.4801 13174 0.8482 0.4601 13083 03589 0.4402 12990 1600.0 1600.0 1700.0 1800.0 1900.0 03696 0.4200 12896 03912 03788 12700 0.9133 03356 12488 0.9364 02892 12257 0.9618 02379 1.1996 2000.0 2200.0 2400.0 2600.0 2800.0 0.9922 0.1754 1.1676 3000.0 1.0461 0.0651 1.1112 3200.0 1.0785 0 13785 3226.0 30 Chapter 1. Air. Water ani> Steam 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 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 heat. When more heat is added, the water begins to evaporate and expand at constant temperature until the water is entirely changed into steam. The heat thus added is known as the latent heat of evaporation. PROPERTIES OF STEAM Steam is water vapor which exists in the vaporous condition because sufficient heat has been added to the water to supply the latent heat of evaporation and change the liquid into vapor. This change in state takes place at a definite and constant temperature which is determined solely/ by the pressure of the steam. The volume of a pound of steam is the/ specific volume which decreases as the pressure increases. The reciprocal of this, or the weight of steam per cubic foot, is the density. . (See Table 8:) Steam which is in contact with the water from which it was generated is known as saturated steam. If it contains no actual water in the form of mist or priming, it is called dry saturated steam. If this be heated and the pressure maintained the same as when it was vaporized, its temperature will increase and it will become super-heated, that is, its temperature will be higher than that of saturated steam at the same pressure. REFERENCES Temperature of Evaporation, by W. H. Carrier (A.S.H.V.E. Transactions, Vol. 24, 1918, p. 25). The Evaporation of a Liquid into a Gas, by W. K. Lewis {A.S.M.E. Transactions, Vol. 44, 1922). The Evaporation of a Liquid into a Gas--a Correction, by W. K. Lewis {Mechanical Engineering, September, 1933). ... Temperature of Evaporation of Water into Air, by W. H..Carrier and D. C. Lindsay {A.S.M.E. Transactions, Vol. 46, 1924). A New Psychrometric or Humidity Chart, by C. A. Bulkeley (^..S.H.V.E. Trans actions, Vol. 32, 1926, p. 163). A Review of Psychrometric Charts, by C. O. Mackey {Heating and Ventilating, June, July, 1931). Air. Conditioning Applied to Cold Storage and a New Psychrometric Chart, by C. A. Bulkeley {Refrigerating Engineering, February, 1932). The Psychrometric Chart, by E. V. Hill {Aerologist, April, May, June, 1932). Air Conditioning Theory, by John A. Goff {Refrigerating Engineering, January, 1933). Mixtures of Air and Water Vapor, by' C. A. Bulkeley {Refrigerating Engineering, January, 1933). 31