Thread: DIY heat pump??
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Old 09-20-2008, 02:47 PM   #1 (permalink)
Xringer
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DIY heat pump??

I've got this little window AC that we use in the bed room.
It cools the room nicely with it's 5,250 BTU/h using only 540 watts.

This morning, it was kinda cool here in New England. It in the 50s
outdoors and in the low 60s inside the house.
To take the chill out, I plugged in a 1500 watt space heater.

Humm, 1500 watts.. Is 1500 watt-hours really equal to 5118.2 BTU/h ??

That must be right, since the little 1500W heater does heat up the room ok..

So, what seems strange is my little window AC unit is putting out 5,250 BTU/h
and it's only using 540 watts! (960W less than the space heater).

How does the AC do that?? I think it might have to do with the fact it's
pumping outside air into a hot coil and exhausting really hot air..
It's a heat pump. Pumping hot air OUT of my house, by simply heating
up the great outdoors (adding to global warming).

HowStuffWorks "Air-conditioning Basics"


So, what if I turned it around backwards in the window, blowing cold air outside..?. And Hot air inside!

Would I get 5,250 BTU/s of heating for a mere 540W (instead of 1500W)??

This is the kind of stuff that keeps me awake at night..

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Rich

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