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The unit cost of the refrigeration produced in the cycle, Cv, will be decreased as the inlet temperature to the compressor rises only if the value of the term ( -CpTc) in eq A7 is negative, which is an equivalent statement of eq 4. Since this result is independent of T¡ itself, if eq 4 is satisfied and a vapor-liquid exchanger is used, Tj should take on the largest value allowed by the second law of thermodynamics.If the assumption of the ideal gas law and constant specific heat are not satisfied, a similar result is obtained (Barnés, 1973), except that CP must be calculated at T¡ and instead of the value + AHC must be used, where AHC represents the difference between low-pressure and high-pressure vapor enthalpy at Tc.