When the refrigerant pipeline the compressor, the refrigerant in the discharge line is all vapor. As the refrigerant moves with the condenser it begins to cool, and also changes state. At this suggest the refrigerant is a mixture that liquid and vapor. Together the refrigerant exit the condenser, the refrigerant has now changed to every liquid. At this point, if a website glass is mounted you need to not see any bubbles. A solid column of liquid relocating to the expansion device is forced for a properly operating AC system.
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As the refrigerant passes v the development device, the refrigerant once again changes into liquid/vapor mixture and also continues to remain in this state through most of the evaporator coil. Close to the exit point of the evaporator and also entrance come the suction line, the refrigerant has adjusted to all vapor once again.
Remember – as soon as using your PT chart as a diagnostics tool, it only involves the refrigerant in the liquid/vapor state, an interpretation the refrigerant in the condenser and evaporator coils. As soon as the refrigerant exists in a liquid and also vapor state, the is in a condition called saturated.
Superheat and Subcooling
Superheat is measured at the places where the just vapor is present (the suction line) and also is the difference in between the saturation temperature and the measure temperature. In a appropriately operating HVAC system, the measure up temperature will constantly be over the saturation temperature, usually 5-20F depending upon the manufacturer and system conditions.
Subcooling is measured in ~ the places where just liquid is present (the fluid line) and is the difference between the saturation temperature and also the measure up temperature. In a properly operating HVAC system, the measured temperature will constantly be listed below the saturation temperature, generally 5-15F depending upon the manufacturer and also system conditions.
So, if we have the right to determine the press at any of the points whereby the refrigerant is in the saturated state, we can discover the corresponding saturation temperature on ours PT chart. You can also determine the press of the refrigerant in the saturation state by measure up the temperature, although the is much less complicated and much more convenient to measure the pressures.
If friend would prefer to become an HVAC technician and also learn much more about refrigeration and also refrigerant, sign up for our virtual HVAC course. We have interactive superheat and subcooling exercises because that measuring superheat and subcooling.
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by Ron Walker
After retiring indigenous the U.S. Marines and also achieving his B.S. Degree, Ron Walker entered the HVAC field. He has been an HVAC technician, organization manager, and business owner. Working as a business manager, the spent plenty of years cultivate HVAC technicians to be much more technically competent and also really know their trade. His enthusiasm for teaching and helping others resulted in the production of HVAC maintain Solutions, LLC.
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