Pop-Sci DIY HRV (1986)
 

Plans from a 1986 Pop-Sci... they're still readable.

-AC_Hacker

great post,

has anyone used a car or lorry intercooler radiator as a heat exchanger as these are quite cheap and designed for air heat transfer ?


Regards
p

builditinyourshed,

I'm not so sure I know what this looks like, or how it works. Do you have a photo or drawing or more detailed description?

-AC_Hacker

http://www.infinitemotorsport.com/im...ntercooler.jpg

usually used in turbocharged engines the intake air to the engine gets heated by the turbo so it then goes through the intercooler which is normally cooled by air from the front grill. Basically a radiator except for air.

OK, now I see what you mean...

Well, you are right that it is an air to air heat exchanger...

I think that it is designed for a pretty high temperature differential, because it looks to me that the surface area might be rather small.

Can you find one for cheap, from an automobile salvage yard to try out?

The cross-stacked squares of corplast can amount to some serious area for pretty cheap. Around here, they use corplast for political yard signs, and after the election, they are worthless (so are the politicians, but that's another story).

-AC_Hacker

I agree they are meant for high heat differential and realistically the largest I've ever seen are for the big rigs and they're not 4sqft in size. They also aren't exactly cheap being big specialized pieces of aluminum. Coroplost should be much much less expensive.

"Ductless" Heat Recovery Ventillator...
 

Here's something to tickle the fancy of anyone who is considering doing a DIY Heat recovery Ventillator...


Since it mounts on the wall, ducts are not required.

Interesting configuration, kind of breaks out of the 'thinking box' of other HRVs.

Product Info...

-AC_Hacker

While trying to find a way to bond CPVC pipe to coroplast I came across a link to this company that apparently uses coroplast for the heat exchanger.

Building Performance Equipment, Inc. - Air to Air Energy Recovery Ventilators - Product List

I don't see that listed on their page though

Looks pretty interesting.

Here's a drawing of the HX box... apparently they are doing a counter flow arrangement... apparently one channel is straight-through, the other, I can't quite figure out.

Any ideas?

-AC_Hacker

I searched for about an hour to find an image in a pdf which showed a counter-current fine-wire heat exchanger. The pdf can be found in Breathing Window ))) Smart Ventilation System )) Kristinsson and one can also see the set-up of the heat exchanger. A fascinating device!