My quick answer is to use a ceiling fan- it is quiet, efficient and made to do
exactly what you are trying to do.
In the summer you have it blow the air down to create a draft but in the
winter you change the switch to blow the air up whiich will circulate the air
but create a very minimal draft (if any). All ceiling fans that I have ever
seen have that reversing switch.
BillM
> From: rdgard@cox.net
> To: spridgets@autox.team.net
> Date: Tue, 18 Jan 2011 19:17:19 -0800
> Subject: [Spridgets] Thermal dynamics question (No LBC Content)
>
> NO LBC CONTENT!
>
> Hi all,
>
> I know that a lot of the people on this list are much smarter than I am on
> many different topics. Several times I have asked a question and gotten
> great answers that I would not have thought of.
>
> So here is my situation and followed by my question.
>
> When it gets chilly here at night in the winter (don't tell me how much
> colder it is where you are, ok?) I sometimes turn on the heater and it gets
> plenty warm up at the ceiling and still chilly half down the room and worse
> on the floor. Ok, we all know heat goes up.
>
> So My big idea is to build a small square tube (about 6 inches square) and
> put a small silent computer fan in it. I have an area next to a book case
> that if I paint it the wall color, you would never notice it. (Here is
where
> I need your advice.) I want to take the cold air from the floor and push
it
> up the tube and exit it at the top so it will start a movement of air,
> pulling the cold air from the floor and warming it up at the ceiling,
> creating a more even temp distribution in the room.
>
> OR
>
> Should I suck the hot air from the ceiling and exit it on the floor level,
> heating up the cold air on the floor. Or does it matter if the air
movement
> goes up or down?
>
> These little fans move about 100 cu ft/min of air. If I put two fans, one
> at the bottom and one at the top would it increase the air flow or just
make
> one of them work harder and/or make more noise. I know if I put them in
> parallel it would push twice as much air, but in series would it make any
> difference?
>
> Thanks in advance for your good advice and your slings and arrows about my
> freezing 56 degree winter here in San Diego.
>
> Cheers,
>
> Bob
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