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Hydronic pumps all do the same basic thing—they circulate water. So why are there so many different types and configurations? And what criteria determines the best pump for a given application? That’s what we will be exploring in this series on "How to...
Read MoreMany institutional and industrial projects use steam to heat the water for hydronic heating, domestic water, or processes. The pipe size prior to the steam control valve is often shown, but the pipe size from the control valve to the steam-to-water heat exchanger or converter is rarely shown. A question we receive often is...
Read MoreWe recently introduced the part load efficiency value (PLEV) aspect of the Bell & Gossett online pump selection tool. PLEV for pumps is based on flow rate while the Integrated Part Load Value (IPLV) for chillers is based on load. This final segment on PLEV will look at the difference.
Let’s begin by examining....
Read MoreIn our last blog we explained why in real life HVAC applications, variable speed pumps almost never operate at zero speed. Even at no flow, the impeller must be spinning enough to produce some amount of pressure at the 2-way valve in order to quickly establish full flow at the critical circuit IF demand suddenly occurs. Here's a silly way to think about it....
Read MoreIn variable speed pumping systems, does zero load ever result zero pump speed?
Practically speaking, the answer is no. In closed hydronic systems with 2-way valves there is almost always some amount of differential pressure created by continuous impeller rotation – even when....
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