815. 5 The efficiency of real heat engines and refrigerator engines Prototype heat engine: Q leuco leul Carnot refrigerator engine: Perfect -o Then we have leacl-lecl H O 三yH CC b QHcl-2H=@cc-ec Perfect refrigerator! Violate the second law of thermodynamics 815. 5 The efficiency of real heat engines and refrigerator engines 2. Refrigerator engines A Carnot refrigerator engine has the maximum coefficient of performance of any refrigerator engine operating between the same two reservoirs Similar arguments can be used to prove above statements13 Prototype heat engine: W = QH − QC Carnot refrigerator engine: W = QHC − QCC QHC − QH QCC − QC QH − QC = QHC − QCC QHC − QH = QCC − QC Then we have Violate the second law of thermodynamics! Perfect refrigerator! §15.5 The efficiency of real heat engines and refrigerator engines 2. Refrigerator engines A Carnot refrigerator engine has the maximum coefficient of performance of any refrigerator engine operating between the same two reservoirs. §15.5 The efficiency of real heat engines and refrigerator engines Similar arguments can be used to prove above statements