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I'm working on TRNSYS 18, I created a Heat exchanger connected with cool prop and it works well, after making a compression system with intercooler, with correct results, I added another heat exchanger without connecting it to the compression system, and i run the system, but the results of the compression system changed by 30 C at least, when I delete the new HX the results were correct, I also copy all the system in empty project and it's still the same, it's weird how the values changed by just adding a component without connecting it!
It sounds like you have a variable somewhere in your code that is being used on a call to the Type before it is defined on that call; when that happens, the variable retains its prior value (if any) from the last time the Type was called. This commonly works okay with a single instance of the Type (though it's still not a best practice), but breaks down when there are multiple instances. The first thing I would check is that your component includes an If GetIsParameterReread() section; this section resets the parameters when multiple instances of a Type are in a simulation. I would also check that any calculations based on those parameters (such as an area calculated from length and width parameters) are re-calculated as well, either in the parameter re-read section or the iterative call section. Otherwise, when there are multiple instances of a Type, the variables last assigned or calculated when Unit A of Type X was called will be used when Unit B of Type X is called as well. Good luck!
@gehadrabee24 I agree, you shouldn't see results change just from adding a component and not connecting it to any other part of your simulation. That's usually a sign that there's a bug in the source code of that Type. What Type number are you using for the heat exchanger? I can do some digging and see if I can find the issue. You can also of course email your TRNSYS distributor for technical support when you find a bug like that.
It's a Type I created, Type 7611, do you want me to send it? here is the source code
