Question: P Pmax - 3 Th Pmin - - - - Given that no net heat is transferred during the isobaric processes, Ericsson's idea was to

P Pmax - 3 Th Pmin - - - - Given that no net heat is transferred during the isobaric processes, Ericsson's idea was to incorporate a regenerator into the engine, storing the heat transferred out of the engine during one isobaric process to provide the heat required for the other isobaric process. The efficiency of the engine is then given by W E = (2) Q3 +4' where W is the total work done during a cycle, and Q3-4 is the heat transferred during the isothermal process 3 - 4. (d) Justify why this is the appropriate definition of efficiency. (e) Calculate the efficiency and compare it to the Carnot efficiency. Interpret your result. Hint: you may use, without proof, the result that the isobaric processes 2 -> 3 and 4 -+ 1, together, do zero net work (i.e. W2-+3 + W4-+1 = 0)

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