This app allows the user to display a vapor compression cycle on a refrigerant thermodynamic diagram. Pressure-Enthalpy (P-h), Pressure-Volume (P-v), Temperature-Entropy (T-s) and Enthalpy-Entropy (h-s) diagrams are supported. The app also supports subcritical and transcritical cycles. The user specifies the evaporator, suction vapor, condensing and liquid temperatures for subcritical cycles. The user may specify an isentropic efficiency of 100 percent to show the ideal cycle, or may specify another value to simulate real world vapor compression.

The detail page lists commonly used refrigerant thermodynamic properties.

Evaporator Temp: The temperature at saturation corresponding to the evaporator pressure. Refer to a temperature-pressure chart. For refrigerant blends, this app uses dew point temperature to determine evaporator pressure.

Suction Vapor Temp: The suction line temperature at the inlet of the compressor.

Condensing Temp: The temperature at saturation corresponding to the condensing pressure. Refer to a temperature-pressure chart. For refrigerant blends, this app uses bubble point temperature to determine condensing pressure.

Liquid Temp: The liquid line temperature at the inlet of the expansion device.

Isentropic Efficiency: The ratio of the work required to compress a refrigerant gas by an ideal compressor compared to that of a real world compressor. Ideal compressors compress gas isentropically (at constant entropy). Single speed hermetic scroll and reciprocating compressors typically have isentropic efficiencies around 70 percent which is the program default. Do not confuse isentropic efficiency with volumetric efficiency. Volumetric efficiency is the ratio of the refrigerant mass flow leaving the compressor compared to entering the compressor. Scroll compressors have significantly greater volumetric efficiencies when compared to reciprocating compressors.

For transcritical cycles...

Gas Cooler Press: The refrigerant pressure in the gas cooler. This pressure must be greater than critical. Condensation does not occur in the gas cooler

Gas Cooler Outlet Temp: The temperature of the line leaving the gas cooler. This temperature must fall between evaporator temperature and the isenthalpic (constant enthalpy) temperature of the suction vapor state at gas cooler pressure.