Heat Pumps S.J.T.U. Phase Transformation and Applications All real Hot reservoir Coefficient of Performance QH refrigerators W and heat Limit for ideal pumps require General definition Carnot case work to get heat to flow CP= QH TH from a cold W QH-Qc TH-Tc area to a Ideal coefficient warmer area. Cold reservoir of performance SJTU Physical Chemistry of Materials Spring2005©X.J.Jin Lecture 5 property relationPhase Transformation and Applications S. J. T. U. SJTU Physical Chemistry of Materials Spring 2005 © X. J. Jin Lecture 5 property relation Heat Pumps