Pressure-enthalpy ($P-H$) and temperature-entropy ($T-S$) diagrams for refrigerant R-134a are used to demonstrate an ordinary vapor compression (OVC) cycle. The condenser pressure (high pressure) and evaporator pressure (low pressure) can be varied with the sliders. The coefficient of performance (COP), which is the heat transferred to the evaporator $Q_c$ divided by the compressor work $W$, is calculated. Selecting "cycle" shows the components of the cycle, and moving the mouse over the circled numbers displays the phases present at those points.

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