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We 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 MoreMost--if not all--consulting engineers fear under-sizing pump head in a hydronic HVAC application. No one wants the owner to receive ....
Read MoreNow that the U.S. Department of Energy (DOE) has published the first ever Energy Conservation Standards for Pumps, let’s take a look at some of the finer details of that standard, starting with the associated terminology and what it means...
Read MoreVariable 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....
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