Compressed Air Best Practices - November 2008 - (Page 20) | 11–12/08 Focus Industry STEEL & METALS | AIR COMPRESSOR MONITORING: LOW HANGING FRUIT INTERVAL LOGGING In a recent real project, ERS used two Onset HOBO® U12 data loggers to log the current on a screw air compressor. One of the loggers had a fast sample rate — two seconds. The logger filled up in a day. At the same time, we installed a second logger and collected data in five-minute intervals over two weeks. This showed us the overall load over time. Together, the loggers gave us a better understanding of the compressor’s performance and we could accurately estimate existing energy use and forecast savings potential. In this particular case, the high-speed logging helped us identify a sequencing problem, illustrated in Chart 1 below. Savings will result from changing the sequencing controls to stop two compressors from alternating air production. It is unlikely that we would have discovered the problem solely with 15-minute interval logging. Chart 1: Compressor Sequencing Pattern Problem. “After almost 20 years of customers performing upgrades, market transformation, code changes and the like, when we do energy audits today, we still find between 10 and 20% savings potential.” 20 www.airbestpractices.com http://www.airbestpractices.com
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