Head pressure controller for air conditioning and refrigeration systems.

摘要

The present invention describes a method of controlling the head pressure in a refrigeration or air conditioning system in order to maintain the internal discharge pressure and discharge line pressure substantially equal. The method consists of the steps of measuring the suction pressure of the working fluid with pressure sensing device (116), calculating the internal discharge pressure of the working fluid by multiplying the suction pressure by the internal pressure ratio of the compressor (100), measuring the discharge line pressure of the working fluid with pressure sensing device (126) and then comparing the internal discharge pressure to the discharge line pressure. If the difference between the internal discharge pressure and discharge line pressure is greater than some allowable tolerance, the capacity of the condenser (104) is adjusted by controller (128) to equalize these two pressures.