Evaporator Temp: The temperature at saturation corresponding to the evaporator pressure. Refer to a temperature-pressure chart.

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.

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

Explain the results of the refrigerant comparison...

This app provides useful refrigerant thermodynamic information to the air conditioning and refrigeration system designer when evaluating alternative refrigerant options. This app can also be useful to the service technician when evaluating the likely effectiveness of using an alternative refrigerant in an existing system.

The service technician will most often be interested in the effect that the alternative refrigerant has on the system's expansion device and compressor. In the case of a thermostatic expansion valve (TXV), the flow rate, pressure drop and liquid density will determine the capacity of the existing TXV with the alternative refrigerant. This is listed as "TXV/EXV Capacity Ratio". For example, an alternative refrigerant with a TXV Capacity Ratio of 1.05 will provide 105 percent of the capacity of the original refrigerant through the existing TXV. The app also considers the saturation curve of the alternative refrigerant and determine if the existing TXV will require a different sensing bulb charge. The "TXV/EXV Capacity Ratio" also applies to an electric expansion valve. The controller for this valve must support the alternative refrigerant.

For a system using a capillary tube, the system designer or service technician may use the Capillary Tube Selection app on this website to determine the effect of the alternative refrigerant on the existing capillary tube.

Determining the effect of the alternative refrigerant on the compressor is more complex. The flow rate, suction vapor density and pressure ratio will influence capacity of the existing compressor. The flow rate value provided by the app will have the most direct influence on the compressor capacity. If the alternative refrigerant has a lower flow rate per ton of colling, the existing compressor will have an inversely proportionally higher capacity. For example, if the alternative refrigerant provides a flow rate 25 percent lower, the existing compressor will provide approximately 1 / (1 - .25) = 1.33 times the capacity of the original refrigerant. The pressure ratio and suction vapor density will also influence the capacity of the existing compressor. If the alternative refrigerant provide a higher pressure ratio, the existing compressor will have a lower capacity. If it has a lower suction vapor density, the existing compressor will have a lower capacity. Inversely, a lower pressure ratio and a higher suction vapor density will increase the capacity for the existing compressor. The effect of changes to pressure ratio and suction vapor density on the existing compressor capacity is dependent on the compressor design, and would require extensive performance data of the existing compressor to evaluate.