ME 3333 Chapter : Homework 11 Solutions

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15 Mar 2019
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Steam enters a turbine at 3 mpa, 450 c, expands in a reversible adiabatic process and exhausts at 10 kpa. Changes in kinetic and potential energies between the inlet and the exit of the turbine are small. The power output of the turbine is 800 kw. Entropy eq. 9. 8: m si + 0/ = m se ( reversible s. Inlet state: table b. 1. 3 hi = 3344 kj/kg, si = 7. 0833 kj/kg k. Exit state: pe , se = si table b. 1. 2 saturated as se < sg xe = (7. 0833 - 0. 6492)/7. 501 = 0. 8578, he = 191. 81 + 0. 8578 2392. 82 = 2244. 4 kj/kg kw kj/kg. A reversible adiabatic compressor receives 0. 05 kg/s saturated vapor r-410a at. 200 kpa and has an exit presure of 800 kpa. Neglect kinetic energies and find the exit temperature and the minimum power needed to drive the unit. Energy eq. 6. 12: m hi = m he + w. C, si + 0/ = m gen = 0 )

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