Hydronic Balancing Part 4: How to Develop a System Curve

What is a system curve and how is it used to develop a balanced hydronic system?  

The “system curve” is a graphical representation of the head losses and gains of a particular piping system that result from changes in flow.  And it’s all based on this law:

As you double the flow through the piping the pressure drop increases by the square.  In other words, the pressure drop increases by four times what it was.

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