I am using an equation to calculate the convective heat transfer coefficient, which i used as the input "Top Heat transfer coefficient" for TYPE 560 solar collector.
The model works fine, but TRNSYS gives an error every time the loss coefficient becomes negative. This will happen when the surface temperature is below ambient temperature and convective heat transfer direction will be reversed.
I get the error "The top loss heat coefficient must be greater than 0". I have tried to remove this restriction, in the source code for Type 560, but the error still emerges.
Does anybody know a way to change the allowed minimum values?
