Part Load Efficiency Values (PLEV) Part 2: How to use PLEV for Pump Selection

Part Load Efficiency Values (PLEV) Part 2: How to use PLEV for Pump Selection

In our last blog post, we introduced the PLEV, or Part Load Efficiency Value from Bell and Gossett. This week we look at some selections and how to use PLEV.

PLEV was created to give a weighted average of the pump efficiency for the HVAC and plumbing industry. This new efficiency average gives the engineer or designer an efficiency that is most likely a better representation of the actual...

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Part Load Efficiency Values (PLEV) Part 1: Introducing Bell and Gossett Terminology

Part Load Efficiency Values (PLEV) Part 1:  Introducing Bell and Gossett Terminology

Although the DOE’s new pump efficiency standards raise the bar for manufacturers to build more efficient pumps, its rating system should not be looked at as a shortcut to efficient pump selection. Careful consideration of part load efficiencies applied to realistic load profiles is still the only way ...

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Understanding Primary Secondary Pumping Part 2: Mixing Temperatures (and Flows!) in a Hydronic System

By Chris Edmondson

What happens in a pipe when water of two different temperatures (and perhaps different flow rates) merge? 

There’s a pretty straightforward formula that tells you exactly what the resultant water temperature will be. In this blog, we’ll go over that calculation, as well as take a closer look at how blended temperatures

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Understanding Primary Secondary Pumping Part 1: Behold the Humble Tee!

Are you involved in the design or installation of hydronic systems?  Do you anticipate becoming involved?

 If you answered yes to either of these questions, this blog series on primary/secondary pumping will interest you.  If you are a hydronic’s veteran, feel free to skip the first few blogs in the series – they may be too much of a review.  Better yet, pass them onto a junior associate and

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