What does a Subcooler do?

In a refrigeration system, subcooling is used to bring the refrigerant from the condenser to the thermostatic expansion valve (VTX) in a completely liquid form. When exiting the compressor, the refrigerant is in a high temperature and high pressure state.

What do you mean by subcooled?

The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. For example, water boils at 373 K; at room temperature (293 K) the water is termed “subcooled”.

What lubricant is used with HFC 134a refrigerant?

polyalkylene glycol
Most HFC-134a systems use a synthetic lubricants called polyalkylene glycol (PAGs) or polyol esters (POEs).

Can you add refrigerant on the high side?

Every auto air conditioning system has two service ports: one on the high pressure and one on the low pressure side. When recharging with AC Avalanche refrigerant, for safety, you will charge through the low side service port. Never charge through the high side port.

What is good subcooling?

Subcooling on systems that use a thermostatic expansion valve (TXV) should be approximately 10°F to 18°F. Higher subcooling indicates excess refrigerant backing up in the condenser.

Why is subcooling beneficial?

Subcooling is beneficial because it prevents the liquid refrigerant from changing to a gas before it gets to the evaporator. Pressure drops in the liquid piping and vertical risers can reduce the refrigerant pressure to the point where it will boil or “flash” in the liquid line.

What is subcooling HVAC?

The most basic meaning of subcooling is any temperatures below the saturation temperature. Generally, the lowest temperature a condenser can achieve, the better. In other words, the colder the refrigerant is as it flows into the evaporator coil, the more heat it will be able to absorb.

What is meant by subcooled and saturated boiling?

In subcooled boiling, the temperature of the volume in the pool is lower than the saturation point of the working fluid. In saturated boiling, the whole pool volume is at the saturation temperature of the working fluid for the given pressure.

What AC oil do hybrids use?

Conventional A/C systems typically use PAG or Ester oil, however, all hybrid vehicles require a special polyolester (POE) type oil. These oils have high dieletric or non-conductive properties, that are designed to lubricate the compressor whilst protecting the compressors electrical windings.

What type of synthetic oils are commonly used in new HFC systems?

POEs are synthetic oils commonly used in new HFC systems and for retrofitting CFC and HCFC equipment to HFC refrigerants. Special care must be taken when using POE oils due to their quick absorption of moisture when left exposed to the atmosphere (hygroscopic).

Do you have to vacuum AC lines?

Moisture inside refrigerant lines can contaminate the lines, causing your air conditioning unit to become sluggish. Anytime an A/C unit is installed, or reinstalled due to repair, the refrigerant lines must be vacuumed. Refrigerant already in the lines combines with the moisture that enters the lines.