Advanced Energy Efficiency, Lecture 2: Industry - Rocky Mountain ...

Number of valves
◊ Many valves are unnecessary—Department of
Redundancy Department
◊ Balancing valves, like primary-secondary pumping,
are typically an artifact of excessive pipe friction
◊ If you think you need balancing valves, first reduce
pipe friction: would you use balancing rheostats in
home wiring?
◊ If there’s too much friction in one place, reduce it
—don’t “balance” it by adding more friction (this is
the approved ASHRAE method for duct balancing!)