Table of Contents
How do you test subcooling on a refrigeration system?
To check subcooling, attach a thermometer to the liquid line near the condenser. Take the head pressure and convert it to temperature on a temperature/pressure chart. Subtract the two numbers to get the subcooling.
Where do you measure subcooling at?
liquid line service valve
After the vapor has turned to liquid, any temperature of the liquid below that saturation condensing temperature is called subcooling. Liquid sub-cooling is normally measured at the liquid line service valve. The manufacturer will usually specify the required sub-cooling on the outdoor unit service panel.
How do you measure superheat and subcooling?
Use the dew point temperature on the pressure/temperature chart to obtain the evaporator saturation temperature for superheat, and the bubble point temperature to obtain the condenser saturation temperature to measure subcooling. Wrap your thermocouples with insulation to obtain accurate pipe temperatures.
What is subcooling formula?
Refrigerant liquid is considered subcooled when its temperature is lower than the saturation temperature corresponding to its pressure. The degree of subcooling equals the degrees of temperature decrease below the saturation temperature at the existing pressure. Subcooling Formula = Sat. Liquid Temp.
What is normal subcooling for 410a?
Most heating and cooling systems should operate at a superheat of 10F at the evaporator and between 20F to 25F at the compressor. if your HVAC system has a thermostatic expansion valve (TXV), the subcooling should be between 10F and 18F.
What is the purpose of subcooling?
Subcooling is normally used so that when the refrigerant reaches the thermostatic expansion valve, all of it is in its liquid form, thus allowing the valve to work properly. If gas reaches the expansion valve a series of unwanted phenomena may occur.
What is the range for subcooling?
Subtract the Liquid line Temperature from the Liquid Saturation Temperature and you get a Subcooling of 15. “Typically” on TXV systems the Superheat will range between 8 to 28 degrees with a target of about 10 to 15 degrees. The Subcool range on TXV systems will range from about 8 to 20.
What is normal subcooling temp?
Generally speaking, 10-12° of subcooling at the outlet of the condenser coil is most common. However, you must look for the proper design subcooling for the particular system you are working on. Some systems will require subcooling readings of up to 16° for maximum efficiency and capacity.
What is a normal subcooling temp?
Why is subcooling done in refrigeration?
What can cause high subcooling?
High Subcooling is an indication that more than the designed amount of refrigerant is “backing up” or “packed” into the condenser. This can be caused by overcharge, restriction (such as a contaminated line drier or kinked liquid line), or an undersized or failing closed metering device.
What is normal subcooling for 410A?