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In 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....
Read MoreDesigning, installing and balancing hydronic system became infinitely easier with the introduction of a handy little gadget called a pressure independent control valve or “PIC” valve. These valves, which first hit the market nearly two decades ago, have revolutionized hydronic balancing....
Read MoreThroughout our Hydronic Balancing Series, we’ve been slowly and meticulously making our way to the more complex control systems that we see today. We walked you through the steps of proportionate balancing a simple 3-zone system and taught you how to trim an impeller in accordance with ASHRAE 90.1. Today, we’re going to see what happens when we add variable speed drives to the system.
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