Residential air-air vent heat exchanger source? [RE-wrenches]

Sun Dec 5 13:25:11 PST 2004

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Jeff,

You've hit on an important point when looking at HRV's. The efficiency
listed is the heat exchange efficiency, not the motor or electrical
efficiency. None of the manufacturers (we talked to several a few years
back) cares about the efficiency of the motor, since all the marketing
surrounds the heat exchange efficiency.

Our work around for both energy efficiency in on-grid homes and plain
potential to be able to be operated much in off-grid homes is to
dramatically oversize the unit, and run it on low speed. An oversized
unit needs a lot less fan push to move the air through it, and any fan
is more efficient at slower speed. We cut energy use on these units by
2/3 or more by doing this, at minimal extra capital cost. Typical rule
of thumb is to size the unit per the manufacturer, then go up two sizes,
making sure that the low speed fan operation is about the right cfm
rate.

So far as manufacturers, here are a few I've heard of:
Fantech (great fans) http://www.fantech.net/hrv_erv.htm
American Aldes (http://www.americanaldes.com/HRVRes.html)
Venmar http://www.venmar-ventilation.com/Vent/Eng/hrv2500.html

I cannot personally vouch for any of the above. We refer all folks
interested in HRV's to a great contractor in VT who specializes in just
that.

And an article for Popular Mechanics (SEE! Energy efficiency is making
some in roads)
http://popularmechanics.com/home_improvement/how_it_works/2000/8/heat_re
covery_ventilator/index.phtml

Jeff Wolfe
Global Resource Options
800-374-4494

-----Original Message-----
From: Jeff Irish [mailto:jeff at hvce.com] 
Sent: Sunday, December 05, 2004 11:50 AM
To: RE-wrenches at topica.com
Subject: RE: Residential air-air vent heat exchanger source?
[RE-wrenches]

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Dean,

Any idea what the power draw is on the Lifebreath HRVs?  What size fan
they require?  Are they a continuous load or do they cycle on and off?

Jeff Irish
Hudson Valley Clean Energy, Inc.

> -----Original Message-----
> From: Dean T. Newberry [mailto:deant at dcn.org]
> Sent: Saturday, December 04, 2004 8:01 PM
> To: RE-wrenches at topica.com
> Subject: Re: Residential air-air vent heat exchanger source? 
> [RE-wrenches]
> 
> 
> 
> Your free subscription is supported by today's sponsor:
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> 
> Hi Steve,
> The category is Heat Recovery Ventilators, HRV
> 
> The good ones use corrugated aluminum laminated in a 90 degree cross 
> flow pattern.
> They only need a couple of fans to move the air, or work with another 
> fan in the AC system.
> I used to sell the Lifebreath models, they are very well made and easy

> for a contractor to install.
> 
> The Turbulent Flow Precipitator  Filtering System is a remarkable and 
> very effective design. It is a good adder for people who need the 
> particulates scrubbed.
> 
> Product specs and dealer locator at:  
> http://www.lifebreath.com/life.htm
> 
> I can't recommend them highly enough.
> 
> cul  deant
> 
> Steve Willey wrote:
> 
> >A customer I once had lived in a ranch house with many layered 
> >windows,
> sealed so tight cit was hard to open the front door for the suction. 
> Some
> 5 or more layers in each window. Our largest early PV pioneer system 
> in Zilla Washington about 1982.
> >
> >He also had an air to air heat exchanger for whole house venting that
> captured most of the exiting heat and pre-warmed the incoming air.  A 
> lot of zig-zag sheet metal in a small package.  Searching for such a 
> product now, all I see in heat exchangers are water to water and water

> to air.  Is there anything still made that captures heat in a building

> to outdoor air exchange system?
> >Steve Willey, Backwoods Solar, retired swilley at pwi.net phone (208) 
> >263-4788
> >
> >
> 
> --
> Dean T. Newberry
> Marketing and Sales
> 
> Quantum Energy Group
> 256 Applegate School Road
> Applegate, Ca. 95703
> 
> Tel: 530 878-4585
> Fax: 530 878-6685
> Cel: 530 867-2392
> 
> deant at dcn.org
> http://www.talbottsolar.com/
> http://mjdsolar.com/
> 
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