Justify the importance of three way balancing valve in heat exchanger control.

Justify the importance of three way balancing valve in heat exchanger control.

The role of balancing valves are to control the flow rates in each of the buildings branches to deliver the desired flows in low temperature, chilled, or hot water applications. 

At each heat exchanger the balancing valve is set to provide the desired flow rate to maintain comfort and energy.

Water velocity noise is not caused by water but by free air, sharp pressure drops, turbulence, or a combination of these, which in turn cause cavitation or flashing of water into steam.” 

When comparing the location of installing Mesurflo valves, the one on return side will help in reducing the amount of free air in the coils and hence decrease the potential for noise. Another benefit being thappt you want to balance after the friction loss of the coil not before the loss.