I'd like to know something about heat pumps
And need special oil change, maintenance cost is higher.There is also a scroll compressor, the compressor to solve the screw compressor problems.
Later, screw compressor, screw compressor efficiency is relatively high, relatively large volume, but the noise is great
In the early days, the piston compressor was used. The piston compressor turned the rotary motion into reciprocating motion. Its parts were especially large and easy to break.
