부산대학교 열역학 정oo 08 12 13 14 기말족보

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본문내용

1. Derive the following relationship
(a) The first Gibbs equation: For a closed stationary system containing a simple compressible substance and an internally reversible process;

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3. Refrigerant-134a enters an evaporator (indoor unit of your room) at 293.01 kPa and quality of 0.2. The refrigerant evaporates to absorb heat from the room at the rate of 4,000 kJ/s and leaves the evaporator at saturated vapor state. The room temperature is maintained at 20℃ and frictional pressure loss in the evaporator is negligible.
(a) calculate refrigerant mass flow rate
(b) calculate entropy change in (i)refrigerant, (ii)room, and (iii)total entropy generation rate

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4. Steam enters an adiabatic turbine steadily at 3 MPa and 400℃ and leaves at 50 kPa and 100℃. If the power output of the turbine is 10 MW, determine (a) the isentropic efficiency of the turbine and (b) the mass flow rate of the steam flowing through the turbine.

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