Shunt valve

A shunt valve is placed in a node where water should be able to pass from the return pipe to the supply pipe. The supply pipe temperature is used to regulate the flow, i.e. the flow through the valve is selected so as to meet supply requirements.

The size of the shunt flow, Qs, is calculated from:

 

Where:

 

T* is the required supply temperature.

T_r  is the return temperature.

Q_i  is the supply pipe flow in the node.

 

Note that there are cases in which the requested supply pipe temperature cannot be reached. The programs issues warnings in these cases.