Liquid receiver

[US Iceman]

So you agree the flash gas does have something to do with it then???

Since we are in agreement?

In this case the COP will be increased by the lower mass flow

Only if you consider the use of all of the heat transfer surfaces and the re-balance that occurs. Since less mass flow is circulating at part load, the suction pressure can be increased slightly and the condensing temperature reduced a little.

The refrigeration system itself can become more efficient, but when you consider the motor load and power factor with this, the amount of energy used per kg circulated can increase.

This final effect of this is also determined by the compressor type and if a VFD is used to provide speed regulation. (plus the drive losses too)