Transcription of THERMODYNAMICS TUTORIAL 5 HEAT PUMPS AND …
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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.
In the past the most popular fluids have been ammonia (R717),fluorocarbons and halo-carbons. The most popular of these is R12 or dichlorodifluoromethane (CF2Cl2). The type of refrigerant used in a cycle is largely governed by the evaporation temperature required and its latent capacity. Below is a list of some of them.
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