What is subcooling

The term subcooling refers to a liquid existing at a temperature below its normal boiling point. A subcooled liquid is the convenient state in which, say, refrigerants may undergo the remaining stages of a refrigeration cycle. The amount of subcooling , at a given condition, is the difference between its saturation temperature and. Liquid water at sea level has a saturation (boiling) temperature of 2degrees F. So, any sensible heat taken away from the 1percent saturated liquid point in the condenser can be defined as liquid subcooling.

Subcooling is done in the condenser, the refrig. Key takeaways: superheat occurs in the evaporator to protect the compressor, and subcooling occurs in the condenser to protect the expansion device. It is the act of lowering the temperature of a cooling material to a level that is beyond its saturation point. The saturation point is the temperature where a material can change from one state to another. As an example, water boils at 2degrees Fahrenheit when at sea level.

The difference between the measured liquid line temperature and the saturated condensing temperature is the liquid subcooling. Add refrigerant to increase subcooling. Recover refrigerant to reduce subcooling.

Note that if the subcooling and superheat are correct, and the suction pressure is low, the system probably has low air flow. In refrigeration, subcooling is the process by which a saturated liquid refrigerant is cooled below the saturation temperature, forcing it to change its phase completely. The resulting fluid is called a subcooled liquid and is the. Superheat is the amount of heat that the evaporator (inside unit) picks up after the last of the liquid refrigerant is evaporated. I go over the refrigeration cycle, where superheat is found and what will happen if a Piston or capillary tube system.

Air conditioning and refrigeration systems provide cooling (and heating) by circulating a refrigerant through a system containing a compressor, condenser, thermal expansion valve and an evaporator. The refrigerant gas is compresse cooled and expanded to reduce its temperature and pressure,. For example, water boils at 212° Fahrenheit at sea level (atmospheric pressure of 1 PSIA). That sentence is a fancy way of explaining that subcooling is making sure something is in its liquid state instead of its gaseous state. This blog post seeks to outline what it is, why it’s useful, and some of its best practices.

In most cases, a new-to-the-field HVACR technician can tell you, in general terms, what liquid subcooling is. Higher subcooling indicates excess refrigerant backing up in the condenser. On TXV systems with high superheat, be sure to check the subcooling as refrigerant is added.

A good relational example would be steam. Water will change state to steam (vapor) when it is boiled at 2degrees Fahrenheit at sea level. This allows the liquid to expel heat below saturation pressure=temperature. The process works through the use of a liquid that is made to absorb heat from the area to be cooled.

Tomczyk describes subcooling as measuring the difference between liquid temperature and the liquid saturation temperature at a given pressure. This article takes a closer look at the important role that subcooling plays in overall air conditioning efficiency. It’s based on the idea that every Btu that you remove from the liquid refrigerant going to a system’s evaporator increases the refrigerant’s ability to remove heat by the same number of Btu’s….

Note for the formula below, the linear feet of line set is the actual length of liquid line (or suction line, since both should be equal) use not the equivalent length calculated for the suction line. Use subcooling as the primary method for final system charging of long line set system application. It tells us how well the condensor coil is rejecting the heat.

The vapors come out of the compressor at high pressure and high temperature. Although condenser subcooling is a practical issue in the everyday of refrigeration and air conditioning systems, to. This study is an attempt to start filling up this gap. Set airflow, charge by superheat for fixed orifice, charge by subcooling for TXV then check superheat. BTW, the biggest problem with 410a is the POE lubricant.

It really soaks up the moisture and makes a molecular bond with it.