HW_16 - 0 kPa and 77C to 400 kPa and 327 C. Assuming...

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Homework Assignment 16 1. (a) Describe the ideal process for an (I) adiabatic turbine, (II) adiabatic compressor, (III) adiabatic nozzle and define the isentropic efficiency for each device. (b) On a T s diagram, does the actual exit state (state 2)of an adiabatic turbine have to be on the right hand side of the isentropic exit state (state 2s)? Why? 2. Consider a steam power plant that operates between the pressure limits of 5 MPa and 20 kPa. Steam enters the pump as saturated liquid and leaves the turbine as saturated vapor. Determine the ratio of the work delivered by the turbine to the work consumed by the pump. Assume the entire cycle to be reversible and the heat losses from the pump and the turbine to be negligible. Note: You have to show interpolation process to get full credit 3. Air is compressed by an adiabatic compressor from 10
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Unformatted text preview: 0 kPa and 77C to 400 kPa and 327 C. Assuming variable specific heats and neglecting the changes in kinetic and potential energies, determine (a) the isentropic efficiency of the compressor (b) the exit temperature of air if the process were reversible Note: You have to show interpolation process to get full credit. 4. A hot-water stream at 80C enters an adiabatic mixing chamber with a mass flow rate of 4 kg/s, where it is mixed with a stream of cold water at 30C. If the mixture leaves the chamber at 45C, determine (a) the mass flow rate of the cold water (b) the rate of entropy generation during this adiabatic mixing process. Assume all the streams are at a pressure of 200 kPa. Due by July 21,2010 10:00AM Answers: 2. 337.6 3. (a) 66.5% (b)517.43K 4. (a)9.351 kg/s (b)0.1384kW/K...
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HW_16 - 0 kPa and 77C to 400 kPa and 327 C. Assuming...

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