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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 MoreBy Chris Edmondson
There’s more than one way to pump a chiller or boiler system. In fact, there are five common approaches, and all but one includes some variation of our topic of late -- primary secondary pumping.
Variable Primary Pumping
Contemporary systems that do not utilize primary secondary pumping are typically known as variable primary systems. In this simple design, there is only one set of pumps (chiller or boiler pumps) creating flow for the entire system.
By Chris Edmondson
Piping in a primary secondary pumping systems as a whole can be quite complex, but when it comes to the “primary” part of the system, there are really only two approaches: Dedicated or Non-dedicated.
Figure 1 shows the chillers in a primary secondary system piped with one pump per chiller. If the chillers
By Chris Edmondson
Now that we know what happens when we vary flows and mix temperatures in a primary secondary pumping system, let’s explore these theories in some more realistic scenarios.
As discussed in a previous blogs, when it comes to primary secondary systems, one of three flow patterns is always in occurrence:
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