Three Types of Curve Control for Variable Speed Pumping Systems

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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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Balancing Options for Systems with Variable Speed Pump Control

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Balancing Options for Systems with Variable Speed Pump Control

Last week we learned that ASHRAE defines a balanced system as one that delivers a flow sufficient to achieve a 97% heat transfer at each coil. This week will look at why we balance and outline the strategies that are ...

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Flow Tolerance in a System with Variable Speed Pump Control

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Flow Tolerance in a System with Variable Speed Pump Control

In our last blog we discussed how to leverage system diversity to maximize energy efficiency. Specifically, we learned that we can size heating or cooling capacity based on peak blog load rather than total connected load if the system is designed and operated correctly. Today, we will talk about flow tolerance and how ...

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ASHRAE 90.1-2010/2013: Impact on Variable Speed Pump Control in Chilled Water Systems

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ASHRAE 90.1-2010/2013: Impact on Variable Speed Pump Control in Chilled Water Systems

Today we begin a series of blogs exploring modern variable speed pump control. While we have written about variable speeding pumping in the past, we believe that the increasing presence of variable speed systems, along with the rapid evolution of control options, warrants a comprehensive look at variable speed pump control as a...

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New Pump Efficiency Standards Part 2: The Pump Efficiency Metric (PEI)

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New Pump Efficiency Standards Part 2: The Pump Efficiency Metric (PEI)

Now that the U.S. Department of Energy (DOE) has published the first ever Energy Conservation Standards for Pumps, let’s take a look at some of the finer details of that standard, starting with the associated terminology and what it means...

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