HW_12_Solution

HW_12_Solution - Solution of Homework Assignment 12 1 2...

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Solution of Homework Assignment 12 1. 2. Argon gas expands in a turbine. The exit temperature of the argon for a power output of 250 kW is to be determined. Assumptions 1 This is a steady-flow process since there is no change with time. 2 Potential energy changes are negligible. 3 The device is adiabatic and thus heat transfer is negligible. 4 Argon is an ideal gas with constant
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specific heats. Properties The gas constant of Ar is R = 0.2081 kPa.m 3 /kg.K. The constant pressure specific heat of Ar is c p = 0.5203 kJ/kg· C (Table A-2a) Analysis There is only one inlet and one exit, and thus m m m 1 2 . The inlet specific volume of argon and its mass flow rate are     /kg m 0.185 kPa 900 K 800 K /kg m kPa 0.2081 3 3 1 1 1 P RT v Thus,     s kg 2.7 m/s 100 m 0.005 /kg m 0.185 1 1 2 3 1 1 1 / V A m v We take the turbine as the system, which is a control volume since mass crosses the boundary. The energy balance for this steady-flow system can be
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This note was uploaded on 09/05/2010 for the course MEEN 315 taught by Professor Ramussen during the Summer '07 term at Texas A&M.

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HW_12_Solution - Solution of Homework Assignment 12 1 2...

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