Refrigerant Pressure And Boiling Point: Notes

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The boiling point given in tables for a liquid is always referenced to an atmospheric pressure (1 bar (14.5 psi) absolute pressure). If the pressure acting on a fluid changes, its boiling point also changes.

NOTE:

Pressure is measured in different units: 1 MPa (mega Pascal) corresponds to 10 bar (145 psi) positive pressure. 1 bar (14.5 psi) absolute pressure corresponds to 0 bar (0 psi) positive pressure and thus to the ambient pressure (atmospheric pressure).

It is known that, for example, water boils at a lower temperature when the pressure is lower.

The vapor pressure curves for water and refrigerant R123yf show that, at constant pressure, reducing the temperature changes vapor to liquid (in the condenser) or that reducing the pressure causes the refrigerant to change from liquid to vapor (inside the evaporator).