Hi,

Most of my refrigeration knowledge is theoretica, and i sometimes run into issues when converting that to practical issues.

So, a compressor operates between set-points, which are designer/manufacturer designed. Now, if due to ambinet conditions, the pressure in the condenser changes (assume that it drops), why does it result in a reduction of the compressor work. Shouldn't the compressor be doing the same amount of work, since it is still compressing (or trying to compress) upto the designed setpoint?

If someone installs an electronic expansion valve, and allows the condenser pressure to drop, why would that result in a decrease in compressor consumption? that should only happen if some sort of controller is telling the compressor to adjust its pressure ratio.

Sorry for the long winded question. I am really desperate to understand how compressor set-points work in such a system.

Thanks.