Document rx7MoNnjQvrex7JVJ9eEgxN0V

HEATINC VENTILATING AIR CONDITIONING CUIDE 1944 Table 5. Properties of Monofluorotrichloromethane (Fu) Sat. Temp. F Abs. Press. Lb per Sq In. Volume Liquid Vapor Heat Content and Entropt Taken From -40 F Heat Content liquid Vapor Entropy Liquid Vapor 25 F Superheat 50 F Superheat Ht. Ct Entropj Ht. Ct Entropy 0 5 10 15 20 25 30 35 40 45 50 S3 60 65 70 75 80 83 90 95 100 105 2.59 0.01020 13.700 2.96 0.01024 12.100 3.5b 0.01028 10.700 3.85 0.01032 9.530 4.36 0.01036 8.490 4.94 0.01040 7.580 7.81 8.81 9.82 10.80 11.90 12.90 90.4 0.0178 0.1975 91.2 0.0200 0.1974 92.0 0.0222 0.1973 92.8 0.0243 0.1971 93.7 0.0264 0.1970 94.5 0.0286 0.1969 93.9 0.2049 97.4 f) ?i?n 94.7 0.2047 98.2 0 7117 95.5 0.2045 99.0 0 7114 96.3 0.2043 99.8 0 7! 11 97.2 0.2041 100 7 n 71(V* 98.0 0.2039 101.5 0.2107 5.57 0.01045 6.27 0.01049 7.03 0.U1U53 7.88 0.01057 8.79 0.01062 6.770 6.080 5.460 4.920 4.440 13.90 14.90 16.00 17.00 18.10 95.3 0.0307 0.1969 98.8 0.2038 102.3 n 7i05 96.1 0.0328 0.1968 99.6 0.2037 103.1 o 7im 96.8 0.0349 0.1968 100.3 0.2036 103.8 n.2101 97.6 0.0370 0.1967 101.1 0.2035 104.6 0 7090 98.4 0.0391 0.1967 101.9 0.2034 105.4 0.2098 9.80 0.01066 10.90 0.01071 12.10 0.01076 13.40 0.01081 14.80 0.01086 4.020 3.640 3.300 3.000 2.740 19.10 99.2 0.0412 0.1967 102.7 0.2033 106.2 n 7f7 20.20 100.0 0.0432 0.1967 103.5 0.2033 107 0 n 7no/> 21.30 100.8 0.0453 0.1967 104.3 0.2032 107.8 0.2004 22.40 23.50 101.5 0.0473 0.1967 105.0 0.2032 108.5 Q.20Q3 102.2 0.0493 0.1967 105.7 0.2031 109.2 0.2092 16.30 0.01091 17.90 0.01096 19.70 0.01101 21.60 0.01106 25.60 0.01111 25.90 0.01116 2.500 2.280 2.090 1.918 1.761 1.620 24.50 102.9 0.0513 0.1966 106.4 0.2030 109.9 0.2000 25.60 103.6 1.0533 0.1966 107.1 0.2029 110.6 0.2Q8Q 26.70 104.4 1.0553 0.1966 107.9 0.2028 111.4 0 2088 27.80 105.1 1.0573 0.1966 108.6 0.2028 112.1 0 7087 28.90 105.7 1.0593 0.1965 109.2 0.2027 112.7 0.2085 30.10 106.4 0.0613 0.1965 109.9 0.2026 113.4 0:2084 Table 6. Properties of Water Sat. Temp. F Abb. Press. Lb per Sq In. Volume liquid Vapor Heat Content and Entropt Taken From 4-32 F Heat Content Liquid Vapor Entropy liquid Vapor 50 F Superheat 100 F Superheat Ht Cl Entropy HL Ct Entropy 32 3540 45 50 ' 55. 60 65 70 75 80 "W 90 95 100 105 0.0887 0.01602 3296.0 0.1000 0.01602 2941.0 0.1217 0.01602 2441.0 0.1475 0.01602 2034.0 0.1780 0.01602 1702.0 0.2140 0.01603 1430.0 0.2561 0.01603 1206.0 0.3054 0.01604 1021.0 0.3628 0.01605 868.0 0.4295 0.01606 740.0 0.507 0.596 0.698 0.8ib 0.949 1.101 0.01607 0.01609 0.01610 0.01612 0.01613 U.U1615 632.9 543.3 467.9 404.2 350.3 304.4 0.00 1073.0 0.0000 2.1826 1096.9 2.2277 1120.8 2.2688 3.02 1074.4 0.0062 2.1724 1098.3 2.2172 117? ? 7 2581 8.05 1076.8 0.0163 2.1555 1100.6 2.2000 1124 5 7 2406 13.07 1079.2 0.0262 2.1390 1102.9 2.1832 1126.7 2 2254 18.08 1081.5 0.0361 2.1230 1105.2 2.1667 1129.0 2.2066 23.08 1083.9 0.0459 2.1073 1107.5 2.1506 1131 3 ? ion? 28.08 1086.2 0.0556 2.0920 1109.8 2.1349 1133 <5 2 J74? 33.08 38.07 1088.6 0.0652 2.0771 1112.2 2.1196 1135.8 2 1090.9 0.0746 2.0625 1114.5 2.1046 1138 1 2 1 585 141? 43.06 1093.2 0.0840 2.0483 1116.7 2.0900 1140.3 2.1283' 48.05 1095.5 0.0933 2.0344 1119.0 2.0758 1142 5 2 1158 53.04 1097.8 0.1025 2.0208 1121.2 2.0619 1144.7 2 OQQA 58.03 1100.0 0.1116 2.0075 1123.4 2.0483 1146 8 2 0857 63.01 1102.3 0.1206 1.9946 1125.6 2.0350 1148.9 2 0721 68.00 1104.6 0.1296 1.9819 1127.9 2.0220 1151.1 2 0.588 72.98 1106.8 0.1384 1.9695 1130.2 2.0093 1153.2 2.0458 For properties of steam at high temperatures, see Table 8, Chapter I. 472 CHAPTER 25. REFRIGERATION The evaporator is usually constructed as an integral part of the centrif ugal type condensing unit, to chill water which is then circulated to the air conditioning system. This is done because it would not be economical to pipe these large volumes of refrigerant any distance. Centrifugal compressors like reciprocating compressors can be divided into two general types, open and enclosed. In general, the open type compressor is geared to the driving mechanism, and operates at higher speed than the driving motor or turbine. A modern completely enclosed direct-driven, centrifugal compressor is illustrated in Fig. 2. The compressor capacity can be varied by controlling the condensing pressure. This is accomplished by regulating the quantity and tem perature of the condenser cooling water. The capacity falls off with increasing condensing pressure. Centrifugal compressors are seldom 2 nd. stage compressor Condenser Fig. 2. Enclosed Type Centrifugal Condensing Unit built for less than 50 tons capacity, since it is not practical to make impellers which pump much less than the volume of refrigerant required for this tonnage. The steam jet type of compressor, under certain circumstances, is desirable for use in air conditioning1. Steam supplies directly the power' used for compressing the refrigerant, thus eliminating the losses connected with other methods of supplying energy. As the compression ratio between the evaporator and condenser under normal circumstances is large, the mechanical efficiency of the equipment is somewhat lower than that of the positive mechanical type compressor. The condensing water requirements are considerably greater, as both the refrigerant and the impelling steam must be condensed. The steam jet system functions on the principle that water under high vacuum will vaporize at low temperatures. Steam jet boosters or com pressors of the type commonly used in power plants for. various processes will produce the necessary low absolute pressure to cause evaporation of the water. Application and Economy of Steam Jet Refrigeration to Air Conditioning, by A. R. Mumford and A. A. Markson (A.S.H.V.E. Transactions, Vol. 44, 1938, p- 33).