815. 4 refrigerator engines and the second law of thermodynamics 3. The Carnot refrigerator engine Isothermal processes: 2→1Qn=nRT , >T 4→3Q=nRTn Adiabatic processes: 1→)4TV y-1 T -1 815.4 refrigerator engines and the second law of thermodynamics Q K Ou-0 nITIn 3 nRTH In -nRTc In Carnot11 3. The Carnot refrigerator engine Isothermal processes: 1 2 2 1 ln V V → QH = nRTH 4 3 4 3 ln V V → QC = nRTC 1 3 1 2 3 2 − − → = γ γ THV TCV 1 4 1 1 1 4 − − → = γ γ THV TCV 4 3 1 2 V V V V = p o V TH >TC TC Adiabatic processes: §15.4 refrigerator engines and the second law of thermodynamics H C C T T T K − Carnot = 4 3 1 2 4 3 ln ln ln V V nRT V V nRT V V nRT Q Q Q W Q K H C C H C C C − = − = = §15.4 refrigerator engines and the second law of thermodynamics