#11) A geothermal system uses water to cool Refrigerant 134a in a heat exchanger. The refrigerant has mass flow rate of 6 lb/min. It enters at 50F as a saturated vapor and leaves at the same temperature as a saturated liquid. The cooling water enters at 300 kPa and 40F and leaves at 45F. Neglect any pressure drops. For water, h(40F) = 8.02 BTU/lb, h(45F) = 13.04 BTU/lb. For R134a (50F), h=27.28 BTU/lb, hg = 108.74 BUT/lb (hig-81.46 BTU/lb) (a) Determine the mass flow rate of the cooling water required. (4 pts) Weu = m (hi-he) Wev 300 - (hi-he) (13.04-8.02) (b) Determine the rate of heat transfer between the two fluids. (3 points) R = AH = (13.04-8.02) R-134a 3 50F Sat'd vapor 59.7 IN 45 F 40 F O 8 4 50 F sat'd liquid