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Originally Posted by joe1234  Ah, that makes sense now. So the condenser (compressor) keeps pumping the same, but the expansion valves only releases correct amount of liquid. |
Correct.
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| So are systems with the TXV valve less efficient? It sounds as if they are wasting energy in order to not freeze up the coil. |
No, it increase efficiency and performance. How or why?
A fixed metering device has no control, and on a high load, the coil may not have enough liquid to boil off to remove the heat, and then the superheat is higher, and the compressor is running hotter, and working harder to run.
TXV controls the superheat allowing the coil to do it's full job with the right amount of liquid into the coil to remove the heat, and the cool gas is able to help cool the compressor and longer life and better efficiency.