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Variable speed drives do not compensate for an imperfect pump selection. In fact, they can make the situation worse. It is okay to be slightly conservative in your pump selection if you are not 100% sure how the pumps are going to be piped, but....
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 MoreIt makes sense to select a pump based on a wide range of operating conditions, not just peak load. This will yield more savings than a pump selection based on the singular sweet spot of Best Efficiency Point (BEP). Instead of focusing on that point where the system curve intersects with the BEP, we need to look at a broader operating range, the boundaries of which form what is called an “Efficiency Island”. Efficiency Islands are....
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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