Document XOaR28yx3Gx79QKv9d9LEzbrJ

HEATINC VENTILATINC AIR CONDITIONING CUIDE 1944 Table 1. Properties of Ammonia Sat. Trap. F Abb. Press, Lb per Sq In. Volume TiiqijiH Vapor -40 FHeat Content and Entbopt Taxbn Fbom Heat Content Entropy 100 F Superheat 200 F Saperheat liquid Vapor liquid Vapor HL Ct. Entropy Ht Ct Entropy 0 2 4 5 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 39 40 41 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 102 * 104 ' 106 108 110 112 114 116 118 120 . 122 124 126128 30.42 31.92 33.47 34.27. 35.09 0.02419 0.02424 0.02430 0.02432 0.02435 9.116 8.714 8.333 8.150 7.971 36.77 0.02440 38.51 0.02446 40.31 0.02451 42.18 0.02457 44.12 0.02462 7.629 7.304 6.996 6.703 6.425 46.13 0.02468 48.21 0.02474 50-36 0.02479 5239 - 0.02485 54.90 0.02491 6.161 5.910 5.671 5.443 5.227 57.28 0.02497 S9.74 0.02503 62.29 0.02508 64.91 0.02514 67.63 ! 0.02521 . 5.021, 4.825 4.637 4.459 4.289 70.43 0.02527 71.87 0.02530 73.32 0.02533 7430 0.02536 76-31 0.02539 4.126 4.048 3.971. 3.897 3.823 79.38 82.55 85.82 89.19. 92.66 0.02545 0.02551 0.02558 0.02564 0.02571 3.682 3.547 3.418 3.294 3.176 96.23 99.91 103.7 107.6 111.6 0.02577 0.02584 0.02590 0.02597 0.02604 3.063 2.954 2.851 2.751 2.656 115.7 0.02611 120.0 0.02618 124.3 0.02625 128.8 0.02632 133.4 0.02639 2365 2.477 2.393 2312 2.235 138.1 0.02646 143.0 0.02653 147.9 0.02661 153.0 0.02668 158-3 0.02675 2.161 2.089 2.021 1.955 1.892 163.7 0.02684 . 1.831 169.2 0.02691 1.772 174.8 .0.02699 1.716 180.6 0.02707 1.661 186.6 0.02715 1.609 192.7 0.02723 1.559 198.9 0.02731 1.510 205.3 0.02739 1.464 211.9 0.02747 1.419 218.6 0.02756 1.375 225.4 0.02764 232.5 0.02773 239.7 0.02782 247.0 '0.02790 254.5 0.02799 U34 1.293 1.254 1.217 1.180 262.2 0.02808 270.1 0.02817 278.2 0.02827 286.4 0.02836 1.145 1.112 1.079 1.047 294.8 0.02846 1.017 .. 303.4 0.02855 0.987 312.2 0.02865 0.958 321.2 0.02875 0.931 42.9 45.1 47.2 48.3 49.4 51.6 53.8 56.0 58.2 60.3 62.5 64.7 66.9 69.1 71.3 73.5 75.7 77.9 80.1 82.3 84.6 85.7 86.8 87.9 89.0 91.2 93.5 95.7 97.9 100.2 102.4 104.7 106.9 109.2 111.5 113.7 116.0 118.3 120.5 122.8 125.1 127.4 129.7 132.0 134.3 136.6 138.9 141.2 143.5 145.8 148.2 150.5 152.9 155.2 157.6 159.9 162-3 164.6 167.0 169.4 171.8 174.2 176.6 179.0 181.4 183.9 186.3 188.8 611.8 612.4 613.0 613.3 613.6 614.3 614.9 615.5 616.1 616.6 617.2 617-8 618.3 618.9 619.4 619.9 620.5 621.0 621.5 622.0 622.5 622.7 623.0 623.2 623.4' 623.9 624.4 624.8 625.2 625.7 626.1 626.5 626.9 627.3 627.7 628.0 628.4 628.8 629.1 629.4 629.8 630.1 630.4 630.7 631.0 631.3 631.5 631.8 632.0 6323 632.5 632.6 632.9 633.0 633.2 633.4 633.5 633.6 633.7 633.3 633.9 634.0 634.0 634.0 634.0 634.0 633.9 633.9 0.0975 0.1022 0.1069 0.1092 0.1115 1.3352 1.3312 1.3273 1.3253 1.3234 0.1162 0.1208 0.1254 0.1300 0.1346 1.3195 1.3157 1-3118 1-3081 1-3043 0.1392 0.1437 .0.1483 0.1528 0.1573 1-3006 1.2969 1.2933 1.2897 .1.2861 0.1618 0.1663 0.1708 0.1753 0.1797 1.2825 1.2790 1.2755 1-2721 1.2686 0.1841 0.1863 0.1885 0.1908 0.1930 1.2652 1.2635 1.2618 1.2602 1.2585 0.1974 0.2018 0.2062 0.2105 0.2149 1.2552 1.2519 1.2486 1.2453 1.2421 0.2192 0.2236 0.2279 0.2322 0.2365 1.2389 1.2357 1-2325 1.2294 1*2262 0.2408 .0.2451 0.2494 0.2537 0.2579 1.2231 1.2201 1.2170 1.2140 1.2110 0.2622 0.2664 0.2706 0.2749 0.2791 1.2080 1.2050 1.2020 1.1991 1.1962 0.2833 0.2875 0.2917 0.2958 0.3000 1.1933 1.1904 , 1.1875 1.1846 1.1818 0.3041 0.3083 0.3125 0.3166 0.3207 1.1789 1.1761 1.1733 1.1705 1.1677 0.3248 0.3289 0.3330 0.3372 0.3413 1.1649 1.1621 1.1593 1.1566 1.1538 0.3453 1.1S10 0.3495 1.1483 0.3535 ,1.1455 0.3576 1.1427 0.3618 0.3659 0.3700 0.3741 1.1400 1.1372 1.1344 1.1316 666.8 1.4439 720.3 13317 667.6 1.4400 7213 13277 668.4 1.4360 7223 13236 668.8 1.4340 722.6 13216 6693 1.4321 723.1 13196 670.1 1.4281 724.1 13155 670.9 1.4242 725.0 13115 671.7 1.4205 725.9 13077 672.5 1.4168 7263 13039 673.4 1.4130 7273 13001 674.2 1.4093 728.7 1.4963 675.0 1.4056 729.6 1.4925 675.8 1.4021 730.5 1.4889 676.6 13985 731.4 1.4853 6773 13950 732.4 1.4816 678.1 13914 7333 1.4780 678.9 1.3879 734.2 1.4744 679.7 13846 735.1 1.4710 680.4 13812 736.0 1.4676 681.2 13779 7363 1.4643 681.9 13745 737.7 1.4609 6823 13729 7383 1.4592 682.7 13712 738.6 1.4575 683.1 1.3696 739.0 1.4559 683.4 13680 7393 1.4542 684.2 13648 740.4 1.4510 684.9 13616 7413 1.4477 685.6 1.3584 7423 1.4445 686.4 1.3552 7434 1.4412 687.1 13521 744.0 1.4382 6873 13491 7443 1.4351 6883 13460 745.7 1.4321 689.2 1.3430 746.5 1.4290 689.9 1.3399 747.4 1.4260 690.6 1.3370 7483 1.4231 6913 13341 749.1 1.4202 691.9 13312 749.9 1.4172 692.6 13283 7503 1.4143 6933 13254 751.6 1.4114 694.0 13226 752.4 1.4086 694.6 6953 695.9 696.6 6973 13199 7533 13171" -754.1 1.3144 755.0 13116 755.8 13089 756.6 1.4059 1.4031 1.4004 13976 13949 697.8 13063 6983 13040 699.1 13010 699.7' 13983 7003 . .1.2957 757.4 ' 7583 759.1 759.9 760.7 13923 13896 13870 13843 13818 700.9 . 7013 702.1 702.7 7033 1.2932 1.2906 1.2881 1.2855 1.2830 7613 7623 763.0 763.8 764.6/ 13793 13768 13743 13718 1.3693 703.8 7043 705.0 705.5 706.1. 13805 1.2780 1.2755 13731 13708 7653. 13668 766.1 13643 766.9 13619 767.6 1-3596 7683 13573 706.6 13684 769.1 13550 707.2 13661 769.8 13527 707.7 13636 -7703 13503 708.2 13612 7713 13479. 708.6 1.2587, 772.0 13455 709.1 1.2563 7723 13431 709.6 1.2538 7733 13407 710.0 1.2513 774.2 13383 466 CHAPTER 25. REFRICERATION removed by an available cooling medium. In order to conserve refri gerant, virtually all refrigeration systems are completely closed and the same refrigerant is recirculated. The fundamental heat equations (disregarding losses) which should be kept in mind are: (1) the heat absorbed in the evaporator plus the heat added to the refrigerant during compression equals the heat rejected by the condenser; (2) the heat added to the refrigerant during compression is equal to the input to the compressor shaft less the heat dissipated from the compressor to the surroundings. In the case where the compressor is driven by an electric motor, the heat due to compression is equal to the motor input less the electncal motor losses, less the power transmission losses and less the heat dis sipated from the compressor to the surroundings. Heat of Compression Added to Gas Refrigerants There are many substances which might be used as refrigerants in mechanical refrigeration systems, but in practice, the choice is limited by a wide variety of considerations including availability, cost, safety, chemical stability and adaptability to the type of refrigerating system to be used. In this chapter detailed consideration is limited to six'substances, viz: ammonia, dichlorodifluoromethane (FI2), methyl chloride, carbon dioxide, monofluorotrichloromethane (Fn), and water, properties for each of which are given in Tables 1,2,3,4, 5 and 6: Each table gives the principal physi cal properties of the. saturated substance, and'all are arranged in uniform fashion. In all except the water table, columns are included which give the heat content and entropy of the superheated vapor at two selected points. The first four refrigerants, named are used in reciprocating and rotary compressors. The last two are used in centrifugal compressors. Water is also used in steam jet equipment. 467