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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Manual Versus Automatic Balance in a Variable Speed Pump Control System

Manual Versus Automatic Balance in a Variable Speed Pump Control System

We’ve talked about manual versus automatic balancing methods and we’ve talked about curve control versus area control. Now it’s time to consider the balance valve type impact on the pump control area. Let’s start this conversation with a question...

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