SHANDONG UNIVERSITYChap6 Summary-11Why we need 2nd Law? All processes satisfy 1st Law; Satisfying 1st does not ensure the process can actually occurHeat EnginesRefrigerator, Heat PumpIntroduction to 2nd LawRefrigerators/heat pump: The devices drive heat Q transfer from TL to TH, Thermal energy ReservoirReceive heat QH from a high temperature sourceThe work input to the refrigerator/heat pumpHeat QL absorbed from refrigerated space TLA process has direction Energy has quality and quantityHeat Sou