The Adiabatic Process
The APR Control modulates the adiabatic process. This happens twice within the refrigeration system. Inside the compressor and also after the expansion valve but before the entrance to the evaporator. Another way of expressing this, the APR Control proportionally modulates the differential pressure or compression ratio (lift) in reaction to actual load.
The APR Control does this proportional modulation while maintaining an extremely efficient evaporator. Notice the black arrows (on the right edge of the diagram) showing the beginning and end of the compression line, which represents the work (hp) the compressor is engaged in, are closer together indicating that there is less work performed during “adiabatic modulation.” The work required by the compressor is represented by the line from point 1 to point 2, the APR Control will reduce work from point 1a to point 2a during modulation. The diagram exaggerates the differences for demonstration purposes.
This means that the compressor is now doing less work for increased evaporator efficiency. While the APR Control is active, kw/hr consumption is improved (The APR is NOT Hot Gas Bypass).
The APR Control delivers a cost effective solution when part of an energy optimization plan!