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

[Brad Bassett]

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I have a Fantech HRV without built in fans, I installed two Fantech 19 
watt (120vAC) fans on the in and out. I then put in a 3 speed switch and 
run them on the lowest speed. I figure I'm using about the smallest 
electrical load of any HRV. I run it on a timer for 6 periods per day, 
for a total of about 8 hours per day. It's hard wired so I haven't put 
my Kill-a-watt meter on it. It does wonders for indoor air quality and 
keeping the indoor humidity down (heating only climate). I get lots of 
condensate when it's cold out. 

I can't say that I'm really impressed with the Fantech HRV however. It's 
core is Coroplast polypropylene honeycomb layers about 1/4" thick all 
glued into a block with each layer 90deg to the other. The quality and 
heat exch. efficiency are so-so seems to me.

I'm not sure if you can get any other HRV's without the fans built in 
though. I got my Fantech stuff from www.hvacquick.com, good service.

Brad
 

Jeff Wolfe wrote:
> 
> 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. 


Brad Bassett
AEE

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