Document gbKGnLqGwqjB34Bm5nw6oojG9

HEATINC VENTILATINC AIR CONDITIONING GUIDE 1941 Table 5. Properties of Monofluo^otrichloromethane (Fu) Sat. Temp. F AB8. Lb peb So Is. Volume liquid Vapor Heat Content and Entboft Taken From --<o F Heat Content liquid Vapor Entropy liquid Vapor 25 F Superheat 50 F Superheat HL CL I Entropy: Ht CL Entropy 0 5 10 IS 20 25 2.59. 0.01020 13.700 2.96 0.01024! 12.100 3.38 0.01028| 10.700 3.85 0.01032 9.530 4.36 0.01036 8.490 4.94 0.010401 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] 94.7 0.2047 97.4 0.2120 98.2 0.2117 95.5 0.2045 99.0 0.2114 96.3 0.2043 99.8 0.2111 97.2 0.2041 100.7 0.2109 98.0 0.2039 101.5 0.2107 30 35 40 45 50 5.57 0.0104S 6.27 0.01049 7.03 0.01053 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 96.1 96.8 97.6 98.4 0.0307 0.1969 0.0328 0.1968 0.0349 0.1968 0.0370 0.1967 0.0391 0.1967 98.8 99.6 100.3 101.1 101.9 0.2038 0.2037 0.2036 0.2035 0.2034 102.3 103.1 103.8 104.6 105.4 0.2105 0.2103 0.2101 0.2099 0.2098 55 60 65 70 75 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 20.20 21.30 22.40 23.50 99.2 0.0412 0.1967 100.0 0.0432 0.1967 100.8 0.0453 0.1967 101.5 0.0473 0.1967 102.2 0.0493 0.1967 102.7 0.2033 103.5 0.2033 104.3 0.2032 105.0 0.2032 105.7 0.2031 106.2 0.2097 107.0 0.2096 107.8 0.2094 108.5 0.2093 109.2 0.2092 85 90 95 100 105 16.30 0.01091 17.90 0.01096 19.70 0.01101 21.60 0.01106 23.60 0.01111 25.90 0.01116 2.500 2.280 2.090 1.918 1.761 1.620 24.50 25.60 26.70 27.80 28.90 30.10 102.9 103.6 104.4 105.1 105.7 106.4 0.0513 0.1966 0.0533 0.1966 0.0553 0.1966 0.0573 0.1966 0.0593 0.1965 0.0613 0.1965 106.4 107.1 107.9 108.6 109.2 109.9 0.2030 0.2029 0.2028 0.2028 0.2027 0.2026 109.9 110.6 111.4 112.1 112.7 113.4 0.2090 0.2089 0.2088 0.2087 0.2085 0.2084 Table 6. Properties op Water . .Sat .Temp P PAressas,.. Lb per .SqIn Volume Liquid Vapor +52Heat Content and Enteoft Taken From F Heat Content Liquid Vapor Entropy liquid Vapor 50 F Superheat. 100 F Superheat Ht. Ct. Entropy hlcl Entropy 32 35 40 45 50 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 0.00 3.02 8.05 13.07 18.08 1073.0 1074.4 0.0000 0.0062 2.1826 2.1724 1096.9 1098.3 2.2277 2.2172 1120.8 1122.2 2.2688 2.2581 1076.8 1079.2 1081.5 0.0163 0.0262 0.0361 2.1555 2.1390 2.1230 1100.6 1102.9 1105.2 2.2000 2.1832 2.1667 1124.5 1126.7 1129.0 2.2406 2.2234 2.2066 55 60 65 70 75 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 23.08 28.08 33.08 38.07 43.06 1083.9 1086.2 1088.6 1090.9 1093.2 0.0459 0.0556 0.0652 0.0746 0.0840 2.1073 2.0920 2.0771 2.0625 2.0483 1107.5 1109.8 1112.2 1114.5 1116.7 2.1506 2.1349 2.1196 2.1046 2.0900 1131.3 1133.5 1135.8 1138.1 1140.3 2.1902 2.1742 2.1585 2.1432 2.1283 so 85 90 95 100 105 0.507 0.596 0.698 0.815 0.949 1.101 0.01607 0.01609 0.01610 0.01612 0.01613 0.01615 632.9 543.3 467.9 404.2 350.3 304.4 48.05 53.04 58.03 63.01 68.00 72.98 1095.5 0.0933 2.0344 1119.0 2.0758 1142.5 2.1138 1097.8 0.1025 2.0208 1121.2 2.0619 1144.7 2.0996 1100.0 0.1116 2.0075 1123.4 2.0483 1146.8 2.0857 1102.3 1104.6 0.1206 0.1296 1.9946 1.9819 1125.6 1127.9 2.0350 2.0220 1148.9 1151.1 2.0721 2.0588 1106.8 0.1384 1.9695 1130.2 2.0093 1153.2 2.0458 For properties of steam at high temperatures, see Table S. Chapter I. 450 CHAPTER 24. 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 conditioning. 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. 451