This generation of variable-speed pumps can internally sense how many valves are open or closed and adjust speed accordingly. Variable speed pumps have been around for years. As I mentioned in last ...

The way we control the speed of fan motors or pump motors has tremendously changed in the past two decades with the introduction of variable-frequency drives (VFDs), aka variable-frequency controllers ...

In a previous article A New Age In North American Hydronics I promised that we would venture into the word of light commercial pump sizing using variable speed pumps. How many times have we been ...

ASHRAE 90.1 addresses efficiency for chilled water pumping systems with guidelines for controls that result in pump motor demand of no more than 30% of design wattage at 50% of design flow. The ...