5.31 The evaporator of a vapor compression refrigeration cycle utilizing R-123 as the refrigerant is being used to chill water. The evaporator is a STHX with the water flowing through the tubes. The water enters the heat exchanger at a temperature of 54°F and leaves at 44°F. The evaporating pressure of the refrigeration cycle is 6 psia and the condensing pressure is 75 psia. The refrigerant is flowing through the cycle with a flow rate of 16,250 lbm/h. The R-123 leaves the evaporator as a saturated vapor, and leaves the condenser as a saturated liquid. Determine the following:

a. Volumetric flow rate of the chilled water leaving the evaporator (gpm)

b. UA product of the evaporator (Btu/h·°F)

c. Heat transfer rate between the refrigerant and the water (tons)