Sep 19, 2017

THIS EXAMPLE ILLUSTRATES THE INTERACTION OF A CLOSED SYSTEM WITH ITS AMBIENT. A CLOSED TANK…

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This example illustrates the interaction of a closed system with its ambient. A closed tank contains 100 kg of hot liquid (m) water at state 1 (temperature T1 = 600 K). A heat engine uses the heat from the water to produce work rejecting heat to its environment that exists at a uniform temperature T0 = 300 K. Consequently, the water temperature changes from T1 to T0 over a finite time period.

a. Show that the expression for maximum work is given where c is the specific heat of water.

b. What is the maximum possible (optimum) work output from the engine? The specific heat of the water c = 4.184 kJ kg–1 K–1.


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