In calculating the reversed Carnot ASC coefficient of performance for comparison with that of a reversed Brayton ASC, the temperature limits are always taken as TL = "the compressor inlet temperature," and TH = "the expander inlet temperature."
(a) Why is this done?
(b) What would happen if the cycle limit temperatures were used instead (i.e., taking TL = "the expander outlet temperature" and TH = "the compressor outlet temperature")?