An electric pump at steady state is pumping water out of a pond that is at 2 bar at a rate of 50 kg/s. this water is then delivered at a pressure of 6 bar. the pumps efficiency is 70%, if electricity is 10 cents per kwh, estimate the hourly cost to run this pump. there is no heat transfer and change in kinetic and potential energy can be ignored.

Aheat pump with refrigerant-134a as the working fluid is used to keep a space at 25°c by absorbing heat from geothermal water that enters the evaporator at 500c at a rate of 0.065 kg/s and leaves at 40°c. the refrigerant enters the evaporator at 20°c with a quality of 23 percent and leaves at the inlet pressure as saturated vapor. the refrigerant loses 300 w of heat to the surroundings as it flows through the compressor and the refrigerant leaves the compressor at 1.4 mpa at the same entropy as the inlet. determine: (a) the degrees of subcooling of the refrigerant in the condenser, b)-the mass flow rate of the refrigerant . (c) the heating load and the cop of the pump, and d)-the theoretical minimum power input to the compressor for the same heating load.