Here what I am doing is that using the weather data as input parameter, if the global radiation is higher than 100 W/m^2 open the valve. First solar heat will be released to the hot water tank, and then the heat will be given to the Boundry_pT via heat exchanger. I want to see, how the temperature of Boundry_pt changes resp. time.
I also want to use water as Medium in the internal heat exchanger. For that I edited the text box in Medium in the heat exchanger, as Buildings_Media_Water. Is it correct? Otherweise how can I choose water as a medium in the internal heat exchanger?
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Orhun C.
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1Very hard to say from the picture. Please provide code... – Rene Just Nielsen Sep 23 '22 at 15:20
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And open up the "The problem is structurally singular..."; as the real error message is hidden there. – Hans Olsson Sep 26 '22 at 06:53
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It seems that you have two separate fluid-circuits, and you only have one expansion tank (the "exp" component - sorry if I don't have the right terminology).
That means that the flow becomes over-determined in the 2nd circuit - and the pressure under-determined. There are a number of ways of handling it - including adding an expansion tank.
Hans Olsson
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