Newbie question regarding expansion valve
I understand the basic heat pump cycle and all of the components in the system (compressor, condenser, expansion valve, evaporator). I also understand how the basic cycle can be "turned around" (the evaporator turned into the condenser and vice versa) with some valves. My question has to do with the expansion valve.
Where, in a heat pump system, is the expansion valve and capillary tube placed relative to the various valves and other system components ? Pictures and diagrams would be helpful. |
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http://www.iarc.org/~4z5ay/HVAC/tev_3.jpg |
From yhe sticky:
Basic cycle http://www.rosehillwinecellars.com/i...ompression.gif geo heat pump http://www.heat-pumps-systems.com/wp..._heat_pump.jpg |
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I am certain that there is "more than one way to skin the cat", but the solution I found looks pretty simple. |
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The two expansion valves in the diagram can be switched out for a single cap tube or electronic expansion valve. The way of the diagram is the way of the old school split system. The idea behind the rig is you can swap either side of the unit with out the other. The check valves shunting the expansion valves are not there in a straight ac split unit.
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Can you find a diagram showing only 1 TXV/EXV ? |
In theory, it's possible to make a TXV that will work both ways. In practice, I don't know of any TXVs that are designed to work both ways.
That said, TXVs are cheap on the surplus market. |
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