Question

Consider the Circle cycle during which a system undergoes a clockwise circular cycle in the T-S...

Consider the Circle cycle during which a system undergoes a clockwise circular
cycle in the T-S plane. The Circle cycle has its center at temperature Tc and has a radius of
R, where |R| < |Tc|.
(a) Determine the thermal efficiency, ηth, for the Circle cycle. Simplify your result as far as
possible.
(b) If R is fixed and Tc increases, does ηth increase, stay the same, or decrease?
(c) If Tc is fixed and R increases, does ηth increase, stay the same, or decrease?

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