Use of Pressure - Temperature Tables
The pressure - temperature table shows the refrigerants in a state of equilibrium, the pressure of the refrigerant at any particular temperature can be found by using these tables. To use such a table, find the temperature being investigated in the vertical left - hand column. Move across the columns horizontally to find the pressure.

The temperature is always the temperature of the refrigerant. The same table may be used to determine both the condensing and evaporating temperatures and pressures. The condensing values for both temperature and pressure are higher than the equilibrium state. When using this chart, keep several things in mind:
  • The temperature of the refrigerant in the evaporator is about 4C to 7C (8F to 12F) colder than the evaporator when the compressor is running.
  • The temperature of the refrigerant in the evaporator is the same as the evaporator temperature when the compressor is not running.
  • The temperature of the refrigerant in an air-cooled condenser is approximately 17C to 19C (30F to 35F) warmer than the ambient temperature.
  • The temperature of the refrigerant in a water-cooled condenser is approximately 11C (20F) warmer than the water temperature at the drain outlet.
  • The temperature of the refrigerant in the condenser will be about the same as that of the cooling medium after the unit has been shut off for 15 to 30 minutes.


Proceed to the Chart