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Q: The Clean Air Act prohibited the production of chlorofluorocarbons (CFCs) in the United States as of 1996. One widely used CFC, refrigerant R-12, has been replaced by R-134a in many applications because of their similar properties, including a low boiling point at atmospheric pressure, Tsat, = 243 K and 246.9 K for R-12 and R-134a, respectively. Compare the performance of these two refrigerants under the following conditions. The saturated refrigerant vapor at 310K is condensed as it flows through a 30-mm-diameter, 0.8-m-long tube whose wall temperature is maintained at 290 K. If vapor enters the tube at a flow rate of 0.010 kg/s, what is the rate of condensation and the flow rate of vapor leaving the tube? The relevant properties of R -12 at Tsat = 310 K are Pv = 50.1 kg/m3, hfg = 160 kJ/kg, and µv = 150 x 10-7 N · s/m2 and those of liquid R-12 at Tf = 300 K are P1 = 1306 kg/m3, cp,1 = 978 J/kg · K. µ1 = 2.54 x 10-4 N · s/m2, k l = 0.072 W/m · K. The properties of the saturated R-134a vapor are Pv = 46.1 kg/m3, hfg = 166 kJ/kg, and µv = 136 x 10-7 N · s/m2.