What is the difference between friction loss related pressure loss and heat transfer enhanced pressure drop?
When a HVACR system has a high friction related pressure loss (too small a refrigerant line size for example), even though a pressure drop is seen at the liquid line port, the pressure seen by the compressor is actually higher, while reducing pressure due to better heat transfer actually results in a lower pressure at the outlet of the compressor. Lower head pressure at the outlet of the compressor results in increased efficiency, whereas increased head pressure at the outlet of the compressor results in decreased efficiency.
