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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Manual Versus Automatic Balance in a Variable Speed Pump Control System

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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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Types of Balancing Devices for Systems with Variable Speed Pump Control

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Types of Balancing Devices for Systems with Variable Speed Pump Control

Today’s flow balancing devices for variable flow pumping systems fall into three main types...

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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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