Document b5VqvrKnNJbwE9raoaj89w713

HEATING VENTILATING AIR CONDITIONING GUIDE 1943 Table 1. Properties of Ammonia SAT. Temp. F 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' 122 124 126 128 Pbehs. Lb per 8qIh. Liquid Vapor 30.42 0.02419 31.92 0.02424 33.47 0.02430 34.27 0.02432 35.09 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 5299 0.02485 54.90 0.02491 6.161 5.910 5.671 5.443 5.227 57.28 0.02497 5.021 59.74 0.02503 '4.825 62.29 0.02508 . 4.637 64.91 0.02514 4.459 67.63 0.02521 4989 70.43 0.02527 71.87 0.02530 73.32 0.02533 74.80 0.02536 76.31 0.02539 4.126 4.048 3.971 3.897 3.823 7998 0.02545 82.55 0.02551 85.82 0.02558 89.19 0.02564 92.66 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 2.565 2.477 2-593 2.312 2.235 138.1 0.02646 143.0 0.02653 147.9 0.02661 153.0 0.02668 1589 0.02675 2.161 2.089 2.021 1.955 1.892 163.7 0.02684 169.2 0.02691 174.8 0.02699 180.6 0.02707 186.6 0.02715 1.831 1.772 1.716 1.661 1.609 192.7 0.02723 198.9 0.02731 2059 0.02739 211.9 0.02747 218.6 0.02756 1.559 1.510 1.464 1.419 1.375 225.4 0.02764 232.5 0.02773 239.7 0.02782 247.0 0.02790 254.5 0.02799. 1.334 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 303.4 0.02855 312.2 0.02865 321.2 0.02875 1.017 0.987 0.958 0.931 Heat Content and Entropt Taken From --40 F Heat Content Entropy 100 F Superheat 200 F Superheat liquid Vapor liquid Vapor Ht. Ct. Entropy Ht. Ct. Entropy 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 69.1 719 73.5 75.7 779 80.1 82.3 84.6 85.7 86.8 87.9 89.0 91.2 93.5 95.7 97.9 1009 102.4 104.7 106.9 109.2 1119 113.7 116.0 118.3 1209 1229 125.1 127.4 129.7 132.0 1349 136.6 138.9 141.2 143.5 145.8 148.2 1509 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 6119 612.4 613.0 6139 613.6 6149 614.9 6159 616.1 . 616.6 617.2 6179 6189 618.9 619.4 619.9 620.5 621.0 6219 622.0 622.5 622.7 623.0 623.2 623.4 623.9 624.4 624.8 625.2 625.7 626.1 6269 626.9 6279 627.7 628.0 628.4 . 6289 629.1 629.4 6299 630.1 630.4 630.7 631.0 6319 6319 6319 632.0 6329 632.5 632.6 632.9 633.0 633.2 633.4 6339 633.6 633.7 633.8 633.9 634.0 634.0 634.0 634.0 634.0 633.9 633.9 0.0975 0.1022 0.1069 0.1092 0.1115 0.1162 0.1208 0.1254 0.1300 0.1346 0.1392 0.1437 0.1483 0.1528 0.1573 0.1618 0.1663 0.1708 0.1753 0.1797 0.1841 0.1863 0.1885 0.1908 0.1930 0.1974 0.2018 0.2062 0.2105 0.2149 0.2192 0.2236 0.2279 09322 0.2365 0.2408 0.2451 0.2494 0.2537 0.2579 0.2622 0.2664 0.2706 0.2749 0.2791 0.2833 0.2875 0.2917 0.2958 09000 09041' 09083 09125 0.3166 09207 09248 09289 0.3330 09372 09413 0.3453 0.3495 09535 09576 09618 0.3659 09700 09741 19352 19312 19273 1.3253 19234 19195 19157 19118 1.3081 19043 19006 1.2969 1.2933 1.2897 1.2861 1.2825 1.2790 1.2755 1.2721 1.2686 1.2652 1.2635 1.2618 1.2602 1.2585 1.2552 1.2519 1.2486 1.2453 1.2421 1.2389 1.2357 1.2325 1.2294 1.2262 1.2231 1.2201 1.2170 1.2140 1.2110 1.2080 1.2050 1.2020 1.1991 1.1962 1.1933 1.1904 1.1875 1.1846 1.1818 1.1789 1.1761 1.1733 1.1705 1.1677 1.1649 1.1621 1.1593 1.1566 1.1538 1.1510 1.1483 1.1455 1.1427 1.1400 1.1372. 1.1344 1.1316 666.8 667.6 668.4 668.8 6699 670.1 670.9 671.7 672.5 673.4 674.2 675.0. 6759 676.6 677.3 678.1 678.9 679.7 680.4 681.2 681.9 682.3 682.7 683.1 683.4 684.2 684.9 685.6 686.4 687.1 687.8 688.5 689.2 689.9 690.6 6919 691.9 692.6 693.3 694.0 694.6 6959 695.9 696.6 6979 6979 6989 699.1 699.7 7009 700.9 7019 702.1 702.7 7039 7039 704.3 705.0 705.5 706.1 706.6 707.2 707.7 708.2 708.6 709.1 709.6 710.0 1.4439 1.4400 1.4360 1.4340 1.4321 1.4281 1.4242 1.4205 1.4168 1.4130 1.4093 1.4056 1.4021 19985 19950 19914 19879 19846 19812 1.3779 19745 19729 19712 19696 19680 19648 1.3616 19584 19552 19521 19491 19460 19430 19399 19370 19341 19312 19283 19254 19226 19199 19171 19144 19116 19089 19063 19040 19010 1.2983 1.2957 1.2932 1.2906 1.2881 1.2855 1.2830 1.2805 1.2780 1.2755 1.2731 1.2708 1.2684 1.2661 1.2636 1.2612 1.2587 19563 1.2538 1.2513 720.3 721.2 722.2 722.6 723.1 724.1 725.0 725.9 7269 727.8. 728.7 . 729.6 730.5 731.4 732.4 7339 734.2 735.1 736.0 736.8 737.7 738.2 738.6 739.0 739.5 740.4 7419 742.2 743.1 744.0 744.8 745.7 746.5 747.4 748.2 749.1 749.9 7509 751.6 752.4 7539 754.1 755.0 755.8 .756.6 757.4 7589 759.1 759.9 760.7 761.5 762.2 763.0 7639 764.6 . 7659 766.1 766.9 767.6 768.3 769.1 7699 770.5 7719 772.0 772.8 773.5 774.2 19317 19277 1.5236 1.5216 19196 19155 19115 19077 1.5039 19001 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 1.4351 1.4321 1.4290 1.4260 1.4231 1.4202 1.4172 1.4143 1.4114 1.4086 1.4059 1.4031 1.4004 19976 19949 19923 19896 19870 19843 19818 19793 19768 19743 1.3716 1.3693 19668 19643 1.3619 19596 19573 19550 19527 19503 19479 19455 19431 19407 19383 476 CHAPTER 25. REFRIGERATION 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 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 (F u), methyl chloride, carbon dioxide, monofluorotrichloromethane (Fu), 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. 477