6. Il4 State 4: liquid vapor mixture p 4 Pevap = 7.7 psia Therefore Pheat into pump Pthermal Poutputrad Trad m VI.I.8: REFRIGERANT 12 75 Btu/lbm 3.3lxl0 7 watts 647 kg/sec 5.49xl0 7 watts 7.98xl0 7 watts 428°K 3.69xl0 5 kg Dichlorodifluoromethane (CC1 2 F 2 } has a low freezing point, and a low leakage rate due to its high molecular weight. Like Refrigerant 11, it is a halogen, making leakage detection simple. It is not flammable or explosive, and less toxic than Refrigerant 11. However, its critical temperature is low (385°K). From a Refrigerant 12 pressure enthalpy diagram (6.I9): State 1: dry saturated vapor Tl 2ao°K P1 pevap = 54 psia hl 81. 5 Btu/lbm sl .165 Btu/lbm- 0 R
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