air-to-air hx [RE-wrenches]

[Jeffrey Wolfe, Global Resources]

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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