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Old 03-09-18, 03:10 PM   #1
HugoW
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Join Date: Mar 2018
Location: the Netherlands
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Default Propane expansion valve temperatures?

Hi,

as I am planning to make my own heat pump and I like to be in control of what I do, I am looking into the way the Expansion valve is controlled. I think I have figured out how to make an Arduino controlled valve, but I need to know values to test it. Looking at a convensional valve and the placement in the system:



I can see the capillary bulb or sensor 'steers' the throughput of the valve, based on the temperature between the outlet of the evaporator and the inlet of the pump / compressor. Is there a standard value / value range for specific refrigerants, and if so, which is it for propane / R290?

Thanks,

Hugo

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