Variable Speed Pump Control: How Variations in Demand Load Define the Control Area

Variable Speed Pump Control:  How Variations in Demand Load Define the Control Area

In our last blog, we showed you what happens in a variable speed system when load drops. For clarity, we chose an unrealistically simple example of a system with only one coil. Today we’re going to give our system a small dose of reality by incorporating multiple zones...

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Variable Speed Pump Control: A Quick Review of Fundamentals and Terminology

Variable Speed Pump Control: A Quick Review of Fundamentals and Terminology

We are now three blogs into our series on Variable Speed Pump Control and we are going to hit the pause button and review some fundamentals. If sequentially that seems like a strange thing to do, there is a method to our madness...

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How to Pick a Centrifugal Pump Part 9: Over Speeding HVAC Pumps & Motors

How to Pick a Centrifugal Pump Part 9: Over Speeding HVAC Pumps & Motors

There are times when slightly more capacity or a little more safety factor is warranted in a pump selection. Often we are asked about increasing the speed of the motor above the nameplate rated RPM. There are several things to examine.... 

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Part Load Efficiency Values (PLEV) Part 4: End of Curve Selections

Part Load Efficiency Values (PLEV) Part 4: End of Curve Selections

When looking at Bell & Gossett pump selections we often find higher part load efficiency (PLEV) pump choices are to the right of BEP or best efficiency point. How close to end of curve should a prudent engineer choose?

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Modern Pump Selection Part 5: How the System Curve Moves

Modern Pump Selection Part 5:  How the System Curve Moves

Effective and efficient pump selection demands a thorough understanding of the system curve and how it reflects what happens in the actual system.  This is especially true in today’s variable speed systems.  It’s so important that even though we’ve touched on it many times before, we are going to “hit pause” in this series to focus specifically on ...

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