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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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Is there a limit to the amount of ductwork you can put on a low-static pressure ducted mini-split heat pump?
Posted by Allison Bailes on December 9, 2019
I like mini-split heat pumps, especially of the ducted variety.  And because I don't like to pay for a lot of excess power, I prefer to use ducted mini-splits with smaller blower motors operating at a low total external static pressure.  The Mitsubishi* units we have in our office and that I have...
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A heat pump is an air conditioner with a reversing valve
Posted by Allison Bailes on March 29, 2019
So we've looked at a simple way to estimate the heat pump balance point.  If you also read the comments of that article, you should be aware that there's more to the actual balance point than what I wrote in the article.  Today, though, let's look at two factors that can affect the balance point....
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At the balance point, a heat pump can supply the same amount of heat as a house needs
Posted by Allison Bailes on March 26, 2019
As the outdoor temperature drops on a cold day, a home's heating load increases.  At the same time, decreasing temperature means less heat in the air for a heat pump to pump indoors.  And at one special temperature, the capacity of a heat pump equals the heating load in the house.  That temperature...
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A heat pump pumping heat in winter
Posted by Allison Bailes on February 19, 2019
Since more people are using heat pumps these days, even in cold climates, let's spell out the three different types of heat that conventional heat pumps provide.  Why not!  We've just recently covered the three main sources of home heating and then stepped back and looked another group of three...
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