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Ki-nana18
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Homework Statement
A Carnot heat engine operates between temperatures T1= 400K and T2= 300K. In each cycle the engine receives Qin=1200 J from the high temperature reservoir.
a) Calculate the heat Qout delivered to the low temperature reservoir.
b) Suppose the engine is operated in reverse as a refrigerator. Now the engine receives Qin= 1200 J from the low temperature reservoir. Determine the heat delivered to the high temperature reservoir.
c) Calculate the work done by the engine in part a, and the work done on the refrigerator in part b. Note that both answers should be positive.
d) Find the efficiency of the engine in part a, and the performance coefficient of the refrigerator in part b.
Homework Equations
QH+QC+W=0
##\frac{Q_H} {T_H}##+##\frac{Q_C} {T_C}##=0
e=W/QH
performance coefficient=##\frac{|Q_c|} {W}##
The Attempt at a Solution
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My confusion arises when I get negative values for part c. Mathematically they should be negative, I suspect that I am not grasping a concept somewhere.