Document zz8rvNjbBO1BwoevqEx1M31D7

HEATINC VENTILATING AIR CONDITIONING CUIDE 1941 Table 1. Properties of Ammonia Sat. Temp. F Abb. Press, Lb naa 8q itv. Volume liquid Vapor Hfu t Content and Entropt Taken From --40 F Heat Content Idquit Vapor Entropy Liquit Vapor 100 F Snperheat 200 F Superheat Ht Ct Entropy Ht Ct 0 30.42 0.02419 2 31.92 0.02424 4 33.47 0.02430 5 34.27 0.02432 6 35.09 0.02435 8 36.77 0.02440 10 38.51 0.02446 12 4031 0.02451 14 42.18 0.02457 16 44.12 0.02462 18 46.13 0.02468 20 48.21 0.02474 22 50.36 .0.02479 24 5239 0.02485 26 54.90 0.02491 28 57.28 0.02497 30 59.74 0.02503 32 62.29 0.02508 34 64.91 0.02514 36 67.63 0.02521 38 70.43 0.02527 39 71.87 0.02530 40 7332 0.02533 41 7430 0.02536 42 7631 0.02539 44 79.38 0.02545 46 82.55 0.02551 48 85.82 0.02558 50 89.19 0.02564 52 92.66 0.02571 54 96.23 0.02577 56 99.91 0.02584 58 103.7 0.02590 60 107.6 0.02597 62 111.6 0.02604 64 66 68 . 70 72 115.7 120.0 1244 128.8 133.4 0.02611 0.02618 0.02625 0.02632 0.02639 74 138.1 0.02646 76 143.0 0.02653 78 147.9 0.02661 80 153.0 0.02668 82 158.3 0.02675 84 163.7 0.02684 86 169.2 0.02691 88 174.8 0.02699 90 180.6 0.02707 92 186.6 0.02715 94 192.7 0.02723 96 198.9 0.02731 98 2054 0.02739 100 211.9 0.02747 102 218.6 0.02756 104 225.4 0.02764 106 2324 0.02773 108 239.7 0.02782 120 247.0 0.02790 112 254.5 0.02799 114 262.2 0.02808 116 270.1 0.02817 118 278.2 0.02827 120 286.4 0.02836 122 2944 0.02846 124 303.4 0.02855 126 312.2 0.02865 228 321.2 0.02875 9.116 8.714 8333 8.150 7.971 7.629 7.304* 6.996 6.703 6.425 6.161 5.910 5.671 5.443 5327 5.021 4.825 4.637 4.459 4.289 4.126 4.048 3.971 3.897 3.823 3.682 3.547 3.418 3.294 3.176 3.063 2.954 2451 2.751 2.656 2.565 2.477 2.393 2.312 .2.235 2.161 2.089 2.021 1.955 1.892 1.831 1.772 1.716 1.661 1.609 1.5S9 1.510 1.464 1.419 1.375 1.334 1.293 1.254 1.21? 1.180 1.145 1.112 1.079 1.047 1.017 0.987 0.958 0.931 42.9 45.1 47.2 483 49.4 51.6 533 56.0 58.2 603 62-5 64.7 66.9 69.1 71J 733 75.7 77.9 80.1 823 84.6 85.7 863 87.9 89.0 91.2 93.5 95.7 97.9 100.2 611.8 612.4 613.0 613.3 613.6 0.0975 0.1022 0.1069 0.1092 0.1115 614.3 614.9 615.5 616.1 616.6 : 0.1162 0.1208 0.1254 0.1300 0.1346 617.2 617.8 6183 618.9 619.4 0.1392 0.1437 0.1483 0.1528 0.1573 619.9 620.5 621.0 621.5 622.0 0.1618 0.1663 0.1708 0.1753 0.1797 622.5 622.7 623.0 623.2 623.4 0.1841 0.1863 0.1885 0.1908 0.1930 623.9 624.4 624.8 625.2 625.7 0.1974 0.2018 0.2062 0.2105 0.2149 1.3352 13312 1-3273 1.3253 1.3234 1.3195 13157 1.3118 13081 1.3043 1.3006 1.2969 1.2933 1.2897 1.2861 1.2825 1.2790 1.2755 I.2721 1.2686 J.2652 1.2635 1.2618 1.2602 1.2585 1.2SS2 1.2519 1.2486 1.2453 1.2421 666.8 667.6 668.4 6683 6693 670.1 670.9 671.7 672.5 673.4 674.2 675.0 675.8 676.6 6773 678.1 678.9 679.7 680.4 681.2 681.9 682.3 682.7 683.1 683.4 684.2 684.9 685.6 686.4 687.1 1.4439 1.4400 1.4360 1.4340 1.4321 7203 721.2 722.2 722.6 723.1 1.4281 1.4242 1.4205 1.4168 1.4130 724.1 725.0 725.9 726.8 727.8 1.4093 1.4056 1.4021 1.3985 1.3950 728.7 729.6 730.5 731.4 732.4 U914 1.3879 1.3846 1.3812 1.3779 7333 734.2 735.1 736.0 736.8 1.3745 1.3729 1.3712 1.3696 13680 737.7 738.2 738.6 739.0 739.5 13648 13616 13584 13552 13521 740.4' 7413 7423 743.1 744.0 13317 13277 13236 13216 13196 13155 13115 1.5077 1.5039 13001 1.4963 1.4925 1.4889 1.4853 1.4816 1.4780 1.4744 1.4710 1.4676 1.4643 1.4609 1.4592 1.4575 1.4559 1.4542 1.4510 1.4477 1.4445 1.4412 1.4382 102.4 104.7 106.9 109.2 111.5 626.1 626.5 626.9 627.3 627.7 0.2192 0.2236 0.2279 0.2322 0.2365 1.2389 1.2357 1.2325 1.2294 1.2262 687.8 688.5 689.2 689.9 690.6 13491 13460 1.3430 13399 13370 7443 745.7 746.5 747.4 7483 1.4351 1.4321 1.4290 1.4260 1.4231 113.7 116.0 118.3 120.5 1223 628.0 628.4 628.8 629.1 629.4 0.2408 0.2451 0.2494 0.2537 0.2579 1.2231 1.2201 1.2170 1.2140 1.2110 691.3 691.9 692.6 693.3 694.0 13341 13312 13283 13254 13226 749.1 749.9 750.8 751.6 752.4 1.4202 1.4172 1.4143 1.4114 1.4086 125.1 127.4 129.7 132.0 134.3 629.8 630.1 630.4 630.7 631.0 0.2622 0.2664 0.2706 0.2749 0.2791 1.2080 1.2050 1.2020 1.1991 1.1962 694.6 695.3 695.9 696.6 697.2 1.3199 13171 13144 13116 13089 753.3 754.1 755.0 7S53 756.6 1.4059 1.4031 1.4004 1.3976 1.3949 136.6 138.9 141.2 143.5 145.8 631.3 631.5 631.8 632.0 632.2 0.2833 0.2875 0.2917 0.2958 0.3000 1.1933 1.1904 1.1875 1.1846 1.1818 697.8 698.5 699.1 699.7 700.3 1.3063 1.3040 13010 1.2983 1.2957 757.4 7583 759.1 759.9 760.7 1.3923 13896 1.3870 13843 13818 148.2 150.5 152.9 155.2 157.6 632.5 632.6 * 632.9 633.0 633.2 0.3041 0.3083 0.3125 0.3166 0.3207 1.1789 1.1761 1.1733 1.1705 1.1677 700.9 701.5 702.1 702.7 703.3 1.2932 1.2906 1.2881 1.2855 1.2830 7613 7623 763.0 7633 764.6 13793 13768 13743 13718 13693 159.9 1623 164.6 167.0 169.4 633.4 633.5 633.6 633.7 633.8 0.3248 0.3289 0.3330 0.3372 0.3413 1.1649 1.1621 1.1593 1.1566 1.1538 703.8 704.3 705.0 705.5 706.1 1.2805 1.2780 13755 1.2731 1.2708 7653 766.1 *766.9 767.6 768.3 13668 1.3643 13619 13596 13573 171.8 174.2 176.6 179.0 633.9 634.0 634.0 634.0 0.3453 0.3495 0.3535 0.3576 1.1510 1.1483 1.1455 1.1427 706.6 707.2 707.7 708.2 1.2684 1.2661 1.2636 1.2612 769.1 769.8 770.5 7 71.3 13550 13527 1.3503 1.3479 181.4 183.9 186.3 188.8 634.0 634.0 633.9 633.9 0.3618 0.3659 0.3700 0.3741 1.1400 1.1372 1.1344 1.1316 708.6 709.1 709.6 ' 710.0 1.2587 1.2563 1.2538 1.2513 772.0 7723 7733 7743 1.3455 13431 1.3407 1.3383 444 CHAPTER 24. 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 electrical motor losses, less the power transmission losses and less the heat dis sipated from the compressor to the surroundings. Heat of Compression Added to Qas 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 (F ), 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. 445