Physical Chemistry Converts some of the random Chapter 3 molecular energy of heat flow into HEAT ENGINES macroscopic mechanical energy ( work) a heat engine operating Heat reservoir at T e between two temperatures The heat and work quantities q are for one cycle Engin ●●● (3.1) C Cold reservoir TC gH t qc (32) Fg.32 qH e +gC=l qc <1 (3.3) qH qH4 HEAT ENGINES H C H H C q q q q q e     1 (3.3) Heat reservoir at TH Cold reservoir at TC qH -qC -w Fig. 3.2 Heat Engine A heat engine operating between two temperatures. The heat and work quantities are for one cycle. H qH w q w e | |    (3.1) -w = qH + qC (3.2) < 1 Physical Chemistry C Chapter 3 onverts some of the random molecular energy of heat flow into macroscopic mechanical energy (work)