Hello Mr.
Thornton,
thanks a lot for your reply. You are right, setting the number of simulation years as 10 solves the problem in this case. But I was actually doing a one-year simulation with parameter 28 as 1. The simulation was very big and complicated. So, I just simplified the model to discuss this problem. In actual model, parameterization of Borehole Heat exchanger is same as that in the example. But real-time systems are connected to it (no constant heat extraction. It depends on heat pump operation). I was doing Parameter Studies, where I observed that this error occurs mostly if simulation period is very long (which is now clear because of parameter 28). But in certain parameter combinations, it occurs in the first year itself (this also occurs in parameter combination stated in example model). For example, this error doesn't occur if borehole spacing is increased to 3. This means that there are also some other parameters or factor causing this error. I couldn't find any find any similarities between the parameter combinations in which I am encountering this error. Let me know any other parameters or factors causes this error.
I will share if I find a solution.
Thanks in advance. Have a nice weekend.
Regards
Prasanth