Corbett Lunsford Demonstrates How to Design for Humidity Control Using Weather Data From Ashrae Meteo
rockies63
| Posted in General Questions on
In this video Corbett uses four examples across the USA to demonstrate how to calculate the humidity levels inside your home in order to determine the amount of dehumidification you need. He also provides links to the calculators he uses to size equipment.
DCcontrarian will love this!
https://www.youtube.com/watch?v=8cSTgXcGdx8&t=17s
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Replies
Very interesting, thanks for posting. I didn't realize that ASHRAE put out 99th percentiles for dew point.
Interesting that even Arizona has a 99th percentile dewpoint of 72+. There was a poster in the past couple of weeks asking about designing a hydronic cooling system, who said that the one installer he talked to doesn't do it any more because he had too many troubles with condensation.
I believe in the not-too-distant future it will be normal to have HVAC systems that manage both temperature and humidity.
One of my Contrarian viewpoints is that people make humidity calculations more complicated than they need to be. Corbet showed his paper calculator that you can download and print out from his website, you don't need that. The Aha! moment for me was realizing that if you know the saturation moisture content for a temperature, all you need to do is multiply that by the relative humidity to get the current content. With a table of saturation moisture by temperature and that trick you can easily move between relative humidity, absolute humidity and dewpoint, at different temperatures.
Which gives me an opportunity to show off the spreadsheet I've mad that does that, it's at https://docs.google.com/spreadsheets/d/1LONsi_1Fb6u4PsDQjzrbHn7ToX7yQHHEvr5OxExVwQc/edit#gid=0