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Daox 03-09-10 04:09 PM

Yeah, it would be interesting to see what the European makers have done besides increase the size to get the extra efficiency.

AC_Hacker 04-13-10 04:17 PM

Free ERV Design Software...

Originally Posted by Piwoslaw (Post 6048)
I found a (Swedish?) company that is a global supplier of heat exchangers:
Heatex AB


Don't know if you saw it, but the company has some interesting ERV design software (more properly, sizing software). So if one were going to try to fabricate their own Energy Recovery Ventilator, You could get a good idea where to begin.

The link is here:

Heatex AB - The No.1 Air-to-Air Heat Exchanger Company: Thanks!

... If this doesn't work for you,maybe go to the root URL and look for "software".



Piwoslaw 04-14-10 01:23 AM

Thanx AC:)
Downloaded the program, now I'll have to find some time to play with it.

1blueox 06-01-10 06:06 PM

A very home-made exchanger
These are fascinating posts. Somebody asked about plans for 180 degree counter-flow exchangers so I thought I'd post.

I'm making a counter-flow air to air exchanger out of plywood and aluminum foil as an experiment. The design is very simple: imagine a piece of plywood as wide as the foil and as long as you want. Along the long edges are 1x2's to support the foil. Then the foil is laid on them. On top of the foil at its edges are another pair of 1x2's, with another sheet of plywood on top. Imagine folding the whole thing back on itself every couple of feet giving you two channels for the air, separated by foil (obviously you can't fold the plywood, that's just to give the concept). Add two small fans to move the air, some duct work at each end, and there you have it!

Those of you with far more experience than I have can improve on materials and dimensions, but if the foil is 18 inches wide and maybe 30 feet long, it should do a pretty good job. Humidity is not much of a factor where I live, but if condensation becomes a problem I'll clearly have to modify things a bit. This version is just for my own fun.

Xringer 06-01-10 07:10 PM

Sounds like an interesting experiment. Be sure to post some pics.. :)

And welcome to the group..


Piwoslaw 06-02-10 01:02 AM

Hello 1blueox.
What kind of foil are you planning on using? I'm afraid that typical kitchen-grade aluminum foil is to flimsy and may not be able to handle the pressure differences between the channels it's separating. Aluminum that's slightly thicker than the kitchen stuff should be OK, you may also look around for thin copper foil, which is also a good heat conductor.

As for condensation, you'll get it anywhere that there is a temperature difference and at least some moisture in the air. The incoming air may have more moisture in the morning or during rain, the outgoing air will be carrying moisture from the house (showers, cooking, breathing). You'll have to make a small drain for both channels.

Daox 06-02-10 07:04 AM

Welcome to the site 1blueox. Sounds like a very interesting project. I too would love to see pictures as it progresses. :)

AC_Hacker 06-14-10 11:19 AM

1bluebox, how is the project progressing?


Originally Posted by 1blueox (Post 6938)
I'm making a counter-flow air to air exchanger out of plywood and aluminum foil as an experiment...

This sounds like a worthy project.

From my Internet research, it learned that there are two types of air energy recovery schemes. One uses non-porous membrane material, like aluminum foil, and the other uses a porous material that will allow condensing water to re-humidify incoming air. This might suggest other materials for you to try.

Also, it would seem to me that you'd want to go much thinner than 1x2 for your membrane separator. I'd think that membrane spacing on the order of 1/8 inch would be more in the ball park.

I also came across a DIY ERV discussion wherein someone was considering using a material like plastic food wrap for the membrane material. Seems like such a material would be cheap, easy to work with, quiet, and unaffected by condensation.

As my home insulation and infiltration project progresses, I'm beginning to notice that the controlled admission of new air is now required keep the comfort level at an acceptable level.



Xringer 06-17-10 10:26 PM

I saw some HRV units on Ebay in the $450 range. Looked up the maker and found this
site: HRV Airiva Heat Recovery Ventilator with a video..

Here's an installed review.. Suncourt AIRIVA HE150 Heat Recovery Ventilation System: Everything Else

I've been thinking about air quality a lot lately. My wife has been experiencing
a hacking cough for years and it seems to be getting worse.
Doctors don't have a clue, so I'm wondering if it's airborne irritants.?.
Besides, I kinda like the idea of getting some fresh air during the winter,
when everything is shut up tight.

Daox 06-18-10 07:29 AM

Yeah, that looks about as efficient as the other ones I've seen. I'd like to see something ~90% efficient! :)

I'd try to open up the house when you can, try to get fresh air in. If that seems to help her you may be onto something.

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