Why is my electronic expansion valve not working

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柯
le 12 Sep 2023
Commenté : Yifeng Tang le 15 Sep 2023
Hello, I am building a model of a heat pump air conditionerI am trying to use an electronic expansion valve for throttling, but my electronic expansion valve seems to be in a fully open state all the time, and there is no expected throttling effect, what is the reason? Below is a diagram of my model. T1 and T2 are the temperatures across the evaporator to measure the superheat, and constant 5 is my target superheat.
  1 commentaire
Yifeng Tang
Yifeng Tang le 15 Sep 2023
Suggestion: set up a test harness model first.
Use a reservoir, at high pressure and some subcooling, as inlet to the valve; use another reservoir, at low pressure and some superheat, as outlet of the evaporator. Test your valve and algorithm in that model first.
Then make the inlet reservoir a controlled reservoir, vary pressure, maybe also subcooling, as a function of time, see if your expansion valve is able to maintain a superheat.
A smaller model may also help the community look at your model, if you'd like to share.

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