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The noise of the extractor blowers and the HVAC cooling towers, when they are turned off and back on by the emergency generators

The noise of the extractor blowers and the HVAC cooling towers, when they are turned off and back on by the emergency generators


I wanted to capture a video of the moment that the extractor blowers of the day hospitalization clinic and the HVAC cooling towers of Carmel hospital, disconnected from the generators, than connected to the mains, as they have an impressive noise during this period.
With the cooling towers: While the most right one, have a 230V, 50hz fan motor, the rest have a variable frequency drive (Inverter) motors. that why they takes longer to reach back to full speed, and the lack of starting noise.

youtube_V2mGDsXb5Ks.jpg youtube_7HZ4iOvDtG8.jpg youtube_UK1HmRuWaUQ.jpg youtube_bNNC3Axv09M.jpg

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Filename:youtube_V2mGDsXb5Ks.jpg
Album name:dor123 / Off-topic videos
Keywords:Off-Topic
File Size:7657 Bytes
Date added:Sep 08, 2019
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