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THERMODYNAMICS TUTORIAL 5 HEAT PUMPS AND …

THERMODYNAMICS TUTORIAL 5 heat PUMPS AND refrigeration On completion of this TUTORIAL you should be able to do the following. Discuss the merits of different refrigerants. Use thermodynamic tables for common refrigerants. Define a reversed heat engine. Define a refrigerator and heat pump. Define the coefficient of performance for a refrigerator and heat pump. Explain the vapour compression cycle . Explain modifications to the basic cycle . Sketch cycles on a pressure - enthalpy diagram. Sketch cycles on a temperature - entropy diagram. Solve problems involving isentropic efficiency. Explain the cycle of a reciprocating compressor. Define the volumetric efficiency of a reciprocating compressor. Solve problems involving reciprocating compressors in refrigeration . Explain the ammonia vapour absorption cycle . 1. INTRODUCTION It is possible to lower the temperature of a body by use of the thermo-electric affect (reversed thermo-couple or Peltier effect).

There are two coefficients of performance for such a cycle, one for the refrigeration effect and one for the heat pump effect. 4.2.1 REFRIGERATOR A refrigerator is a device for removing heat at a cold temperature so we are interested in the heat absorbed in the evaporator Φ(in). The coefficient of performance is also called

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