Avapour-compression refrigeration cycle is to use r-134a as a refrigerant. the r-134a is to enter the compressor as a saturated vapour at 2.0060 bar, with a mass flow rate of o.75 kg/s. the r-134a enters the throttling valve as a saturated liquid. the isentropic efficiency of the compressor is o.75. find the rate of refrigeration and the coefficient of performance of the cycle as a refrigerator for the condenser pressure of 6.6525 bar.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.