Find the total work the heat engine can give out as it receives energy from the rock

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Find the total work the heat engine can give out as it receives energy from the rock bed as described in Problem 7.61 (see Fig.P 8.81). write the entropy balance equation for the control volume that is the combination of the rock bed and the heat engine.
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Fundamentals of Thermodynamics

ISBN: 978-0471152323

6th edition

Authors: Richard E. Sonntag, Claus Borgnakke, Gordon J. Van Wylen

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