Explanation No, we can’t replace a turbine with an expansion valve. The main purpose of using an expansion valve is to reduce the temperature and pressure of the refrigerant exiting the condenser till the evaporator can be achieved. The reduction in pressure to the level of evaporator can be attained by utilizing the expansion valve or a turbine. But it will become complicated while reducing the temperature since enthalpy remains constant in expansion or throttle valve. Also, for ideal gas, h = h ( T ) Here, specific enthalpy is h and specific enthalpy with respect to temperature is h ( T )

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Chapter 11.10, Problem 70P

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Can we replace the turbine with an expansion valve as we did in vapor compression refrigeration cycles in gas refrigeration cycles.

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Chapter 11.10, Problem 69P

Chapter 11.10, Problem 71P

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