How to Determine Control Head for a Variable Speed Pumping System

How to Determine Control Head for a Variable Speed Pumping System

To control a variable speed pumping system, we must determine the minimum operational head of the system. Some refer to this value as constant head, minimum head, independent head, etc. Throughout this and in other JMP blogs, we refer to it as ...

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Variable Speed Pump Control Using DemandSet Control Technology

Variable Speed Pump Control Using DemandSet Control Technology

Think you know all there is to know about variable speed control strategies? Don’t be so sure.  A new, patent pending technology from HYFAB called DemandSet brings another option to the table.  It has the potential to yield pump energy savings that are even better than traditional...

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Mr. Creep and the Undermining of Variable Speed Curve Control

Mr. Creep and the Undermining of Variable Speed Curve Control

We call him Mr. Creep.

Mr. Creep is not an actual person but rather a phenomenon of an ever-increasing control head in a variable speed pumping system caused by frequent incidents of underflowing coils, the result of which is progressive increases in operating cost and potential non-compliance....

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Three Types of Curve Control for Variable Speed Pumping Systems

Three Types of Curve Control for Variable Speed Pumping Systems

We’ve been talking about variable speed control since September 11, 2017, beginning with this blog ASHRAE 90.1-2010/2013: Impact on Variable Speed Pump Control in Chilled Water Systems. Throughout our coverage of this topic, we have introduced and re-introduced the concepts of “Curve Control” and “Area Control” as variable speed pumping control strategies, each time digging a little bit deeper. Today we are going to take an all-inclusive look at Curve Control, because we feel like the concept is often misunderstood .....

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