Dear all,
I am working on a Solar Thermal combi-system with lanced storage and for this I am using two double ports in the storage for a single loop i.e. the input and output of the loop is connected in a different double port. I have connected the pump from a one of the double port outlet and the outlet of the pump to the loads and the return from the loads to the inlet of the other double port. The problem i face in this system is that since the loop is not fully a closed loop, the input value to the pump is no longer fully functional i.e. the normal pump type 3d, 110 and the tess library pump 748 does not draw the water out of the tank. It just takes the temperature from the tank and creates a mass flow rate specified in the pump while the connection between the tank output and the pump input shows zero mass flow rate.
In terms of energy, when I see the power through this double port, it shows zero. Did anyone already experience such problem? It would be great if anyone can help me finding a solution. I think if I have a pump which can really draw water from the tank at a specified given flow rate, the problem will be solved. But all the pump models in trnsys just sets the flow rate to to the input mass flow rate rather then drawing water at this flow rate.
Thanks in Advance and hope someone might be able to help me.
With Regard,
Muthalagappan Narayanan
Research Assistant and PhD Student
Ulm University of Applied Sciences
Germany