Effect of Pressure on Boiling or Condensation

As refrigerant passes through an air conditioning system, it flows under high-pressure conditions, first as a high-pressure vapor between the compressor and A/C condenser core (19712), then, as a high-pressure liquid between the A/C condenser core and the A/C evaporator core orifice (19D990). It expands to a low-pressure liquid at the A/C evaporator core orifice and the refrigerant in the A/C evaporator core (19860) absorbs heat as air passes around the A/C evaporator core, warming the refrigerant into a gas. It returns to the A/C compressor (19703). As pressures in the closed refrigerant circuit vary, temperatures will also vary. As pressures increase, temperatures also increase; as they decrease, temperatures also decrease.