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Technical information Refrigerants Use of Pressure-Temperature Curves

The Use Of Pressure, Temperature Curves

Pressure-temperature curves in Figures 9-2 and 9-20 show refrigerants in equilibrium. Cm. Figure 1-28A, vertical temperature scale in E; horizontal scale of the pressure psig.

Refrigerant pressure in any particular temperature, can be found using these curves. Read horizontally to the temperature reading until curve particular refrigerant is reached, then move down the right pressure reading.

For example, vapor pressure, R-12 refrigerant at a temperature of 100F (38C) 132 psia (911 kPa) or 117 pounds per square inch (807 kPa| temperature the temperature of the refrigerant. Bus same curve can be used to determine how the condensing and evaporation temperatures and pressures. Condensing temperatures and pressures above the equilibrium state.

Using this chart, keep a few things in mind:

  • The temperature of the refrigerant in the evaporator about 8F 12DF (4=C to 7C) cooler than in the evaporator when the compressor is running.
  • The temperature of the refrigerant in the e

    vaporator same as the evaporator temperature at the compressor is not operating.
  • The temperature of the refrigerant in the air cooled condenser is about 30F-35F (17 to 19C) warmer than room temperature.
  • The temperature of the refrigerant in the evaporator with water cooling is approximately 20F (1) warmer than the temperature of the water in the drain opening.
  • The temperature of the refrigerant in the condenser will be approximately the same as the cooling medium after the unit was turned off for 15-30 minutes.


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