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In our last blog, we cautioned against using pressure independent control (PIC) valves when attempting to apply area control with reset. But why is that a problem? Aren’t PIC valves the greatest thing since microwave ovens?...
Read MoreWe call him Mr. Creep.
Mr. Creep is not an actual person but rather a phenomenon of an ever-increasing control head in a variable speed pumping system caused by frequent incidents of underflowing coils, the result of which is progressive increases in operating cost and potential non-compliance....
Read MoreWe’ve been talking about variable speed control since September 11, 2017, beginning with this blog ASHRAE 90.1-2010/2013: Impact on Variable Speed Pump Control in Chilled Water Systems. Throughout our coverage of this topic, we have introduced and re-introduced the concepts of “Curve Control” and “Area Control” as variable speed pumping control strategies, each time digging a little bit deeper. Today we are going to take an all-inclusive look at Curve Control, because we feel like the concept is often misunderstood .....
Read MoreLast week we learned that ASHRAE defines a balanced system as one that delivers a flow sufficient to achieve a 97% heat transfer at each coil. This week will look at why we balance and outline the strategies that are ...
Read MoreIn our last blog we discussed how to leverage system diversity to maximize energy efficiency. Specifically, we learned that we can size heating or cooling capacity based on peak blog load rather than total connected load if the system is designed and operated correctly. Today, we will talk about flow tolerance and how ...
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