what does the changing 4 parameters on a vapor compression refrigeration cycle have on efficiency?

Question

1. compressor speed
2. voltage
3. if the valve is half open
4. flowrate

Answer 1

All the above terms deal with mass flow rate of the refrigerant. In principle the flow rate does not affect plant efficiency. The "efficiency" of the cycle is defined by the Coeffient of performance (COP) which is the ratio of The Refrigeration effect or heat absorbed by the evaporator to the power of the compressor. So you see if you increase the flowrate, the heat absorbed is also increased thereby cancelling out the effect of the flow rate on the COP.
I will tell you the factors which affect effiency:
1. The refrigeration effect(major effect)
2. Power of compressor(major)
3. Subcooling of the refrigerant(small effect)
4. Superheating of refrigerant(small effect)
5. Putting a heat sink btn the end of evarporator and end of condenser

Answer 2

It's obviously very much relative to the particular changes and the degree of each change.


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