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A pair-of-pants tee fitting for the duct system for my new Mitsubishi ducted mini-split heat pump
Posted by Allison A Bailes III, PhD on June 29, 2020
I've written about the load calculation and equipment selection process I went through for the new Mitsubishi* ducted mini-split heat pump in my house.  Now let's take a look at the design and performance of the duct systems for the two air handlers.  Laying out the ducts The schematic diagram...
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A MERV-13 filter in a return filter grille in my dining room ceiling
Posted by Allison Bailes on June 24, 2020
Filtration is on the minds of a lot of people lately.  Because of the coronavirus pandemic, most of us would prefer not to breathe in air that contains any hint of the SARS-COV-2 virus that's been spreading the illness known as COVID-19.  Wearing a mask when going out in public is standard.  Having...
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The outdoor unit for our new Mitsubishi inverter-driven mini-split heat pump system
Posted by Allison Bailes on June 11, 2020
Last year my wife and I bought a 1961 ranch-style house, and I've been having a lot of fun fixing it up.  I wrote about the problem with the spray foam in the attic not covering the top plates and how I fixed it when we had the soffits, fascias, and gutters replaced.  I've also had a lot more spray...
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The three main rating scales for filter efficiency:  MERV, FPR, and MPR
Posted by Allison Bailes on May 28, 2020
As much as I've written about filters and filtration in this blog, I have to confess there's one aspect of filter efficiency I've resisted learning about.  Every article I've written that mentions filter efficiency talks about only one rating scale:  Minimum Efficiency Reporting Value (MERV).  A...
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Ultraviolet (UV) lamp installed in air handler to kill microbes on cooling coil and drain pan  [Image from Fresh Aire UV]
Posted by Allison Bailes on April 23, 2020
I used to be a smart-ass who would say things I thought were clever but really were just annoying.  When I learned the basics of quantum physics, for example, I had a clever/annoying answer for anyone who asked me, What's new?  E over h, I'd respond.  Hahaha!  Then we'd both laugh our heads off. ...
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Posted by Allison Bailes on April 13, 2020
Have you ever lived in a home where you just couldn’t feel warm even though you had the heat cranked way up?  How about one where you have to turn up the volume on the TV when the air conditioner or heater comes on?  Or a home with a musty smelling basement? The myths we live by These and more are...
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Using a high-MERV filter doesn't have to result in a large pressure drop
Posted by Allison Bailes on April 10, 2020
Yesterday I gathered with a few of my friends and colleagues from the building performance community for a virtual happy hour.  During our chat, Steve Byers of Energy Logic posed the question:  Compared to BC (before coronavirus), how will you be different once the stay-at-home orders are lifted,...
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Droplets from a sneeze can travel 18 feet across a room
Posted by Allison Bailes on April 8, 2020
Back in 2018 I wrote a series of articles on indoor air quality and filtration.  One of those articles, The Unintended Consequences of High-MERV Filters, has seen a flurry of activity in the comments over the past three weeks.  It all started when a reader named Pat wrote: I have a question about...
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Tesla-Wireless-Power-1891.png
Posted by Allison Bailes on April 1, 2020
Yes, it's April Fools' Day again.  With all that's happening in the world because of the coronavirus, it may have slipped your mind.  It didn't slip mine, but I'm not putting out a new April Fools' Day article this year.  The COVID-19 situation we find ourselves in this year is grim.  I won't go...
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Cancer cells  [by Yale Rosen, from flickr. com]
Posted by Allison Bailes on March 23, 2020
Cancer treatment during the coronavirus pandemic is something I’ve been thinking about for a couple of weeks now.  Then on Friday, Vox published an article on that very topic:  The dilemmas facing cancer doctors and patients in the coronavirus pandemic.  I encourage you to read it. Cancer patients...
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