The variable flow primary secondary design evolved as a way to allow the flow rate to the loads to vary with the load profile, saving a significant amount of pump energy, while maintaining a steady flow rate through the chillers, which protected them. But you ended up with large pumps moving the design flow rate at the design head for all of the operating hours.
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In fact, in the olden days, before we had realized that we needed to pay attention to energy efficiency, the most common chilled water plant design configuration was a constant flow arrangement and a big driver for that was protecting the chiller tube bundles from frosting up and freezing. Unlike current technology chillers, back when this plant was designed, the chiller technology would not deal well with flow variation in the evaporator. The plant was a variable flow primary/secondary plant. It was a 9,000 ton plant one of the largest I have been around for a while. (And still called that by older folks like me who forget they changed the name). Last October, I had the opportunity to support a field class that used the central chilled water plant at the Gaylord Grand Ole’ Opry as a part of the Building Commissioning Association Annual Conference (formerly called the National Conference on Building Commissioning or NCBC). Using Plot Digitizer to Generate Trend Data from a Graphic.Each section has a Back to Contents link that brings you back here. But if you want to jump straight to that, the links below will let you do that (or jump to any of the other topics for that matter). There were two cool features in the plant I will be discussing that I wanted to highlight in addition to illustrating my new Plot Digitizer application. Since it happened while I was working at a really interesting chilled water plant that had some unique features, I thought I would give you a peak at those things also. My goal in this post is to show you an idea that came to me one day out in the field that saved the day for me and involved using plot digitizer in a way I had not thought of before. This link will take you to a page on our commissioning resources web site where I provide more information, and this link will take you to a page where I provide a spreadsheet template that will let you create a formatted pump curve pretty easily from the CSV files you capture with plot digitizer. or you can plot a system curve from the data you collect in a pump test and the square law. For instance, you can use the affinity laws to project a new impeller size from a know impeller size. Once the curve is in the form of a spreadsheet.
jpg file, then you can pretty quickly capture the curve shapes and load them into a spreadsheet to create a chart that is an electronic version of the curve. Meaning that if you have, for instance, a pump curve as a. If you are unfamiliar with it, the application allows to to create CSV (Comma Separated Value) files from the lines in an image. Those of you who know me know I am quite enamored with a little freeware application called Plot Digitizer.
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