A Highrise Hotel Window Head Scratcher
The ASHRAE conference and AHR Expo were in Atlanta last week. Because I live here, I didn't have to stay in a hotel but a lot of people I know came to town and did stay in hotels. One of…
moisture
Defogging Your Car Windshield with Psychrometrics
A lot of people don't understand the best way to defog their car windshield in wet, cool weather. About 30 years ago, I was on a group trip on a hired shuttle bus. The outdoor temperature was probably in the…
What Is the Relative Humidity When It’s Raining?
Serious question here. Have you ever thought about what the relative humidity is when it's raining? I've heard people say it's 100% because, well...because it has to be. It's raining, dammit! What else could it be?Not so fast there. This…
Professor John Straube on Moisture Physics
The 22nd annual Westford Symposium on Building Science (aka, Building Science Summer Camp) happened two weeks ago. And it began with a bang, as Professor John Straube expounded on moisture physics for half a day. I've now had the chance…