LiquidVaporMixture the liquid and vapor

When the refrigerant pipeline the compressor, the refrigerant in the discharge heat is all vapor. Together the refrigerant moves with the condenser it begins to cool, and changes state. In ~ this suggest the refrigerant is a mixture that liquid and also vapor. As the refrigerant exits the condenser, the refrigerant has now adjusted to all liquid. In ~ this point, if a site glass is set up you have to not see any type of bubbles. A solid column of liquid moving to the expansion device is forced for a correctly operating AC system.

You are watching: The state of the refrigerant in the suction line should be

As the refrigerant passes with the growth device, the refrigerant as soon as again alters into liquid/vapor mixture and continues to remain in this state through most of the evaporator coil. Near the exit allude of the evaporator and entrance to the suction line, the refrigerant has readjusted to all vapor once again.

Remember – as soon as using her PT chart together a diagnostics tool, the only comes to the refrigerant in the liquid/vapor state, definition the refrigerant in the condenser and also evaporator coils. As soon as the refrigerant exist in a liquid and also vapor state, the is in a problem called saturated.

Superheat and also Subcooling

Superheat is measured at the areas where the only vapor is current (the suction line) and also is the difference between the saturation temperature and the measure up temperature. In a correctly operating HVAC system, the measure up temperature will always be above the saturation temperature, commonly 5-20F depending on the manufacturer and also system conditions.

Subcooling is measured at the places where just liquid is present (the fluid line) and is the difference in between the saturation temperature and the measure temperature. In a properly operating HVAC system, the measure temperature will always be below the saturation temperature, commonly 5-15F relying on the manufacturer and also system conditions.

So, if we can determine the push at any kind of of the points wherein the refrigerant is in the saturated state, us can discover the corresponding saturation temperature on ours PT chart. Girlfriend can even determine the push of the refrigerant in the saturated state by measuring the temperature, although that is much easier and much more convenient to measure up the pressures.

If friend would favor to come to be an HVAC technician and also learn much more about refrigeration and refrigerant, authorize up because that our virtual HVAC course. We have actually interactive superheat and subcooling exercises because that measuring superheat and also subcooling.

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by Ron Walker


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Ron walker

After retiring native the U.S. Marines and also achieving his B.S. Degree, Ron Walker entered the HVAC field. He has actually been an HVAC technician, business manager, and also business owner. Working as a organization manager, that spent many years training HVAC technicians come be much more technically competent and really know their trade. His enthusiasm for teaching and also helping others brought about the production of HVAC cultivate Solutions, LLC.


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