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Consider a regenerative gas refrigeration cycle using helium as the working fluid. Helium enters the compressor at 100 kPa and -10^∘ C and is compressed to 300 kPa. Helium is then cooled to 20^∘ C by water. It then enters the regenerator where it is cooled further before it enters the turbine. Helium leaves the refrigerated space at -25^∘ C and enters the regenerator. Assuming both the turbine and the compressor to be isentropic, determine ( a ) the temperature of the helium at the turbine inlet

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