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Chilled water condensers are normally operated as constant flow devices and the pumps serving them are constant speed. Why would you ever use a variable speed drive for a pump in this application? This week we show you a couple of reasons...
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....
Read MoreWhat are your options when unbalanced circuits in an existing hydronic system are creating comfort issues due to underflow or overflow through coils? We just spent the last twelve blogs describing the various methods for balancing a start-up system but do those same methods apply to existing systems and retrofits?
The short answer is....
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