From: Bob Blick <bobblick@outlook.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Mon, 28 Jun 2021 10:00:35 -0700
Subject: Re: [EE] HVAC filter efficiency and energy consumption
Thread-Topic: [EE] HVAC filter efficiency and energy consumption
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Hi Mark,
Welcome to the piclist!
With my aging forced-air furnace, one of the things that always worries me =
is the temperature of the heated air and the number of lighting cycles it g=
oes through. I figure the lower and fewer, the better. So I tend to notice =
when the furnace is running and the burner shuts off and then relights a mo=
ment later due to the exit temperature switch operating. One would think th=
at less airflow restriction would lead to cooler air and less cycling of th=
e burner. Changing out a dirty filter for a clean one should reduce restric=
tion, but I have not noticed it making any difference. That leads me to bel=
ieve the filter is not dominating airflow restrictions in the system. My ho=
use is a typical one made with cheap materials to the minimum building code=
 in 1980 or so, just like all the other houses in my neighborhood. The filt=
ers I use are the middle-grade ones(red package) and seem to be the most po=
pular ones available locally.
Cheerful regards, Bob

________________________________________
From: piclist-bounces@mit.edu <piclist-bounces@mit.edu> on behalf of Mark H=
owles=20
Sent: Monday, June 28, 2021 7:51 AM
To: piclist@mit.edu
Subject: [EE] HVAC filter efficiency and energy consumption

Hello,

I was contemplating changing my Air filters to MERV11 and was told by some
people that they are bad for energy usage and air flow. I came across a
study that measured and compared the effects of low efficiency and high
efficiency filters and I found the technical details fascinating. Their
conclusion was that effects are not significant in residential settings.

Does anyone have experience with this, or have monitored this before on
their own?

I thought of just correlating energy consumption increase/decrease around
the initial few days of installing  the filter, at similar temperatures,
though the paper suggests there can be a complex interaction of many
variables before coming to conclusions.

Here is a link to the Study:
https://www.caee.utexas.edu/prof/novoselac/Publications/Novoselac_ASHRAE_Tr=
ansactions_2010.pdf


--=20
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