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HW_9_Solution0 - Solution Homework 9 1 A cylinder is...

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Solution Homework 9 1. A cylinder is initially filled with R-134a at a specified state. The refrigerant is cooled at constant pressure. The amount of heat loss is to be determined, and the process is to be shown on a T-v diagram. Assumptions 1 The cylinder is stationary and thus the kinetic and potential energy changes are zero. 2 There are no work interactions involved other than the boundary work. 3 The thermal energy stored in the cylinder itself is negligible. 4 The compression or expansion process is quasi-equilibrium. Analysis We take the contents of the cylinder as the system. This is a closed system since no mass enters or leaves. The energy balance for this stationary closed system can be expressed as ) ( 0) = PE = KE (since ) ( 1 2 out 1 2 ou , out energies etc. potential, kinetic, internal, in Change system mass and work, heat, by nsfer energy tra Net out in h h m Q u u m U W Q E E E t b     since U + W b = H during a constant pressure quasi-equilibrium process. The properties of R-134a are
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