Document bBq24ZbwwzzO3zOLrYK8GE6x3

HEATING, VENTILATING AIR CONDITIONING GUIDE 1943 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 CL Entropy Ht. Ct Entropy 0 2.59 0.01020 13.700 7.81 90.4 0.0178 0.1975 93.9 0.2049 97.4 0.2120 5 2.96 0.01024 12.100 8.81 91.2 0.0200 0.1974 94.7 0.2047 98.2 0.2117 10 3.38 0.01028 10.700 9.82 92.0 0.0222 0.1973 95.5 0.2045 99.0 0.2114 13 .3.85 0.01032 9.530 10.80 92.8 0.0242 0.1971 96.3 0.2043 99.8 0.2111 20 4.36 0.01036 8.490 11.90 93.7 0.0264 0.1970 97.2 0.2041 100.7 0.2109 25 4.94 0.01040 7.580 12.90 94.5 0.0286 0.1969 98.0 0.2039 101.5 0.2107 30 5.57 0.01045 6.770 13.90 95.3 0.0307 0.1969 98.8 0.2038 102.3 0.2105 35 6.27 0.01049 6.080 14.90 96.1 0.0328 0.1968 99.6 0.2037 103.1 0.2103 40 7.03 0.01053 5.460 16.00 96.8 0.0349 0.1968 100.3 0.2036 103.8 0.2101 45 7.88 0.01057 4.920 17.00 97.6 0.0370 0:1967 101.1 0.2035 104.6 0.2099 50 8.79 0.01062 4.440 18.10 98.4 0.0391 0.1967 101.9 0.2034 105.4 0.2098 55 60 65 . 70 75 9.80 10.90 12.10 13.40 14.80 0.01066 0.01071 0.01076 0.01081 0.01086 4.020 3.640 3.300 3.000 2.740 19.10 20.20 21.30 22.40 23.50 99.2 0.0412 0.1967 102:7 0.2033 106.2 0.2097 100.0 0.0432 0.1967 103.5 0.2033 107.0 0.2096 100:8 0.0453 0.1967 104.3 0.2032 107.8 0.2094 101.5 Q.0473 0.1967 105.0 0.2032 108.5 0.2093 102.2 0.0493 0.1967 105.7 0.2031 109.2 0.2092 80 85 90 95 100 105 16.30 17.90 19.70 21.60 23.60 25.90 0.01091 0.01096 0.01101 0.01106 0.01111 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 0.2090 25.60 103.6 0.0533 0.1966 107.1 0.2029 110.6 0.2089 26.70 104.4 0.0553 0.1966 .107.9 0.2028 111.4 0.2088 27.80 105.1 0.0573 0.1966 108.6 0.2028 112.1 0.2087 28.90. 105.7 0.0593 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 8at. Temp. p AbS. Lb per Volume liquid Vapor Heat Content and Entropt Taken From +32 F Heat Content Liquid Vapor Entropy liquid Vapor 50 F Superheat 100 F Superheat Ht. Ct. Entropy Ht Ct. Entropy 32 0.0887 0.01602 3296.0 0.00 1073.0 0.0000 2.1826 1096.9 2.2277 1120.8 2.2688 35 0.1000 0.01602 2941.0 3.02 1074.4 0.0062 2.1724 1098.3 2.2172 1122.2 2.2581 40 0.1217 0.01602 2441.0 8.05 1076.8 0.0163 2.1555 1100.6 2.2000 1124.5 2.2406 45 0.1475 0.01602 2034.0 13.07 1079.2 0.0262 2.1390 1102.9 2.1832 1126.7 2.2234 50 0.1780 0.01602 1702.0 18.08 1081.5 0.0361 2.1230 1105.2 2.1667 1129.0 2.2066 55 0.2140 0.01603 1430.0 60 0.2561 0.01603 1206.0 65 0.3054 0.01604 1021.0 70 0.3628 0.01605 868.0 75 . 0.4295 0.01606 740.0 .23.08 1083.9 0.0459 2.1073 1107.5 2.1506 1131.3 2.1902 28.08 1086.2 0.0556 2.0920 1109.8 2.1349 1133.5 2.1742 33.08 1088.6 0.0652 2.0771 1112.2 2.1196 1135.8 2.1585 38.07 1090.9 0.0746 2.0625 1114.5 2.1046 1138.1 2-1432 43.06 1093.2 0.0840 2.0483 1116.7 2.0900 1140.3 2.1283 80 85 90 95 100 105 0.507 0.596 0.698 0.815 0.949 1.101 0.01607 632.9 0.01609 543.3 0.01610 467.9 0.01612 404.2 0.01613 350.3 0.01615 , 304.4 48.05 1095.5 0.0933 2.0344 1119.0 2.0758 1142.5 2.1138 53.04 1097.8 0.1025 2.0208 1121.2 2.0619 1144.7 2.0996 58.03 1100.0 0.1116 2.0075 1123.4 2.0483 1146.8 2.0857 63.01 1102.3 3.1206 1.9946 1125.6 2.0350 1148.9 2.0721 68.00 1104.6 0.1296 1.9819 1127.9 2.0220 1151.1 2.0588 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. 482 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 spieed 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 1 st stage compressor Chiller 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). ' . 483