air-to-air hx [RE-wrenches]

[Joel Davidson]

Good ideas, Jeffrey. Another approach that uses less motor power than
forcing air throug honeycomb or baffles is to pre-heat outside air by
drawing it into a building envelope plenum like the boxed and insulated
space between joists and studs or a solar air heater.

"Jeffrey Wolfe, Global Resources" wrote:
> 
> Kirk,
> 
> Have you heard of operable windows?  :)
> 
> I've done quite a bit of research trying to find low energy units. To my
> knowledge, they are not made. These are consumer items, and consumers
> compare the heat recovery efficiency, not the motor ratings. I've talked
> directly to manufacturers (venmar and Mitsubishi, I think) and they have no
> interest in retrofiting or supplying a good motor.
> 
> No reason, other than time and money, that you could not put a good DC
> motor onto the unit to replace the AC motor.
> 
> What I did in theone case where the home owner HAD to have one, is we
> worked with Memphremagog HX (David Hansen, 800-660-5412, in Newport), who
> was installing the unit. We got him to increase the size, thus allowing him
> to decrease the fan speed (more HX area, less pressure drop, and more
> efficient performance). Going from high (normal design) to medium speed cut
> power use by over 1/3. Also, these units are typically now put on timers
> (20 minutes on, 40 minutes off, with overrides in bathrooms and kitchens).
> These two measures make the units more conserving.
> 
> As an option, you might be able to get just the HX part of one of these
> units (maybe as parts from David H.) and put DC motor driven fans outboard.
> But do you really want to be in the HRV (heat recovery unit) design and
> manufacturing business?
> 
> Jeff
> 
> On Wednesday, January 02, 2002 10:53 AM, Kirk Herander
> [SMTP:kirk at vtsolar.com] wrote:
> > Hello,
> >
> > Any one out there have a good, low power alternative to an air-to-air
> heat
> > exchanger for an off-grid home?
> >
> > thanks,
> >
> > Vermont Solar Engineering - a Trace Certified Dealer
> > Kirk Herander
> > PO Box 697
> > Burlington, VT. 05402
> > www.vermontsolar.com
> > 800.286.1252 - 802.863.1202
> > fax 802.863.7908

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