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zebediah49 t1_j191who wrote

This is true; you need some type of pressure drop device.

I give disproportionate credit to the compressor, due to it being the part that does the Work.


exbm t1_j19rjrr wrote

You need to use a compressor some types of systems use external heat but all systems need a flow restricting device


zebediah49 t1_j1a0qqf wrote

Strictly speaking many external-heat systems don't. They use an absorption refrigeration cycle, and while the partial pressure of the refrigerant components changes around, the total pressure of the system is approximately constant.