Solved: A heat pump with refrigerant-134a as the working

Chapter 11, Problem 43P

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11-43 A heat pump with refrigerant-134a as the working fluid is used to keep a space at \(25^{\circ} \mathrm{C}\) by absorbing heat from geothermal water that enters the evaporator at \(50^{\circ} \mathrm{C}\) at a rate of \(0.065 \mathrm{~kg} / \mathrm{s}\) and leaves at \(40^{\circ} \mathrm{C}\). The refrigerant enters the evaporator at \(20^{\circ} \mathrm{C}\) with a quality of 23 percent and leaves at the inlet pressure as saturated vapor. The refrigerant loses  of heat to the surroundings as it flows through the compressor and the refrigerant leaves the compressor at  at the same entropy as the inlet. Determine

 the degrees of subcooling of the refrigerant in the condenser,

(b) the mass flow rate of the refrigerant,

 the heating load and the COP of the heat pump, and

 the theoretical minimum power input to the compressor for the same heating load.

Equation Transcription:

   

   

   

   

Text Transcription:

25°C    

50°C  

0.065 kg/s  

40°C    

20°C