652 Heat Engines, Entropy, and the Second Law of ThermodynamicsP22.53(a)Pelectric=HtET∆so if all the electric energy is converted into internal energy, the steady-statecondition of the house is described by HQET=.Therefore,electricW==Qt∆5000(b)For a heat pump,COPK27 KCarnotaf=TTh∆29510 92.Actual COP==0 6 10 926 55...QWQtWthh∆∆Therefore, to bring 5 000 W of energy into the house only requires input powerheat pumpCOPW6.56W==Wth∆∆763P22.54Qmc T mL mc Tc=++=∆∆QQQWTTTWQT TTccccchcch cc=⋅°°+×+⋅°°=×−=−=×°−−°−=05001020208 10200273 20 0
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .