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Old 06-06-13, 01:01 PM   #7
AC_Hacker
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Quote:
Originally Posted by Ryland View Post
... 300 watt input for 800 watts worth of heat output...
800/300 x 100 = 267%

This is absolutely the first time I have heard of a Peltier junction efficiency achieving anything remotely close to 267% as you stated. The efficiency I have usually seen quoted is in the neighborhood of 17%.

Did you do the tests yourself? Do you know of any studies that match, or even vaguely approximate your results?

I would be very interested to know, as most ASHPs in operation today are about as efficient as you are stating.

Also...

Quote:
Originally Posted by Ryland View Post
...800 watts worth of heat output, cost was about $80...
This would mean that 800 watts out = 800 x 3.412 = 2,729.6 BTU/hr

So, in HVAC terms, where 1 Ton of AC = 12000 BTU...

You would require (12,000/2,729.6) x $80 = $343.35 worth of Peltier Junctions per Ton of HVAC equivalent heating. This would make it at a very minimum, 2x more cost efficient to buy than almost any existing vapor-compression machine.

Are you completely sure of your numbers?

If this is true, a revolution in heating and cooling should now be underway.

Personally, I suspect that there is an error in your numbers.

-AC
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