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ME200 - Lecture 361

# ME200 - Lecture 361 - Vapor Compression Refrigeration...

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12/1/2010 1 Vapor Compression Refrigeration Cycles ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint – [email protected] Lecture 36 November 29 th , 2010 Last Lecture: – Rankine cycle as the ideal cycle for vapor power plant –T h e o r e t i c a l thermal efficiency: Outline 1 4 , 1 / / h h h h m W m W p t Rankine thermal –P r a c t i c a l considerations limiting thermal efficiency – Methods to improve thermal efficiency of simple Rankine cycle, particularly reheating –A n im a t i o n at: http://engrwww.usask.ca/classes/ME/227/rankine/cycles/rankine2/rankine2.html 2 3 / m Q in ME 200 2 Today/Wednesday: –V a p o r Compression Refrigeration (and Heat Pump) Cycles Prof. T.L. Pourpoint - Fall 2010

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12/1/2010 2 Carnot Vapor Compression Cycle     14 in C Qm h h m T s s   ME 200 3      23 out H H h hm T s s mT s s Carnot Vapor Compression Cycle From first law: in out t c QQ W W    desired heat transfer Q Q T Net heat transfer from the refrigerant equals the net work done on the refrigerant • Reversed Carnot cycle is, however, impractical: – isothermal heat addition and heat rejection processes limit the in in C ct o u t i n HC COP required work input W W Q Q T T   This is the maximum theoretical COP for a refrigeration cycle. ME 200 4 maximum and minimum temperatures –e xpan s ion of low quality refrigerant through turbine is complicated, not much work produced – isentropic compression of SLVM difficult Prof. T.L. Pourpoint - Fall 2010
12/1/2010 3

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ME200 - Lecture 361 - Vapor Compression Refrigeration...

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