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Thermodynamics problem, Heat Engine with two heat sinks
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[QUOTE="TeddyLu, post: 4995890, member: 541171"] I'm having a hard time setting up an equation for a heat engine problem with one heat source and two heat sinks given only the temperature of the heat source and temperature of the two heat sinks as: T[SUB]H[/SUB] = 1000 K T[SUB]C1[/SUB] = 200 K T[SUB]C2[/SUB] = 300 K It is given that the two heat rejected are of equal value. determine the maximum thermal efficiency. [h2]Homework Equations[/h2] thermal efficiency (carnot) = 1 - T[SUB]C[/SUB]/T[SUB]H[/SUB] = 1 - Q[SUB]C[/SUB]/Q[SUB]H[/SUB] [h2]The Attempt at a Solution[/h2] Since there was two heat sinks with an equal value of heat rejected at each: Q[SUB]C1[/SUB] = Q[SUB]C2[/SUB] = Q[SUB]C[/SUB] therefore, Q[SUB]H[/SUB] = Q[SUB]C1[/SUB] + Q[SUB]C2[/SUB] will turn into Q[SUB]H[/SUB] = 2Q[SUB]C[/SUB] I took the entropy balance equation to solve for Q[SUB]C[/SUB]: 0 = Q[SUB]H[/SUB]/1000 - Q[SUB]C[/SUB]/200 - Q[SUB]C[/SUB]/300 but I don't have a constant on the other side to figure out for Q[SUB]C[/SUB] to plug back into find Q[SUB]H[/SUB] and then solve for thermal efficiency. any help please? [/QUOTE]
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Thermodynamics problem, Heat Engine with two heat sinks
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