Figure P7.104 provides two options for generating hot water at steady state. In

Question

Figure P7.104 provides two options for generating hot water at steady state. In (a), water heating is achieved by7 utilizing industrial waste heat supplied at a temperature of 500 K. In (b), water heating is achieved by an electrical resistor. For each case, devise and evaluate an exergetic efficiency. Compare the calculated efficiency values and comment. Stray heat transfer and the effects of motion and gravity are negligible. Let T0 = 20 degree C, p0 = 1 bar. Fig. P7.104 Steam enters a turbine operating at steady state at p1 =

Explanation / Answer

efficiency of first =(95-20)/(500-20) =0.156 efficiency of second =(95-20)/(95-20) =1 hence fsecond method is more efficient

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