How do I calculate ACTUAL subcooling?
Manually (the hard way): actual subcooling is measured in much the same way as superheat except liquid line (high-side) temperature and pressure are used in the calculation. Take the temperature of the liquid line as close to the expansion valve as possible, before the metering device. Take the liquid line pressure and convert it to a boiling point temperature using a chart or gauge. Make sure you have the correct chart or gauge for the refrigerant used. Subtract the liquid line temperature from the boiling point (saturation temperature at pressure) on the liquid side of the system to get subcooling. A: Using a subcooling instrument (the easy way): select the proper refrigerant. Connect the pressure port on the instrument to the liquid line. Connect the thermocouple to the liquid line. The instrument will display actual subcooling.
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