1. What is the minimum energy necessary (in kJ) to compress 1.0 kg of saturated

Question

1. What is the minimum energy necessary (in kJ) to compress 1.0 kg of saturated water vapor at 1 bar to a pressure of 60 bar in a perfectly insulated vessel?

Saturated steam at 40 bar is used to run a perfectly insulated turbine. If the exit pressure is 2 bar, what is the state of the exiting fluid assuming no internal irreversibilities?

A perfectly insulated nozzle with an entrance diameter of 2.54 cm has been designed to expand a fluid isentropically. It is desired to expand Refrigerant 22 through the nozzle from a pressure of 10.0 bar and a temperature of 10 deg. C. to a pressure of 1.0 bar. If the input velocity of Refrigerant 22 is to be 0.10 m/s, what must be the diameter of the nozzle outlet to ensure isentropic expansion of the fluid?

Explanation / Answer

The 3rd one is the only correct answer. Quality of .81

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