[Greenbuilding] ERV Issues

[Alan Abrams]

it seems better to take the exhaust leg out the long way.  This is because
of the inefficiency of any unit, the delta between exhaust air and indoor
air temp will be less than the delta between intake and indoor temp.

it may also be worthwhile to analyze the diameter of the ducts, as they
impact static pressure and particularly noise.  it's notable that as
envelope insulation improves, the perception of mechanical noise can
increase.


*Alan Abrams**
Abrams Design Build LLC*
*A sustainable approach to beautiful space*
alan at abramsdesignbuild.com
www.abramsdesignbuild.com
*202-726-5894 o
202-437-8583 c
202-291-0626 f*

>
> > I have an L shaped 36’x26’house with long leg 10’wide and short leg
> > 24’wide.  I am looking at installing HRV near north wall in area common
> to
> > both legs so a straight 4” duct can deliver fresh air to opposite side of
> > each leg.  A parallel duct on one of the legs would deliver exhaust air
> to
> > South side for plenty of separation between inlet and outlet.  Is there a
> > disadvantage for having the exhaust duct going 20’ through conditioned
> > space?  Would it be advantage to have the long leg be the outdoor air
> supply
> > instead.  I could send exhaust air out North side near inlet, but then
> > continue to open end to achieve the separation needed instead of crossing
> > the house.  I would like to use PVC pipe to insure tightness.
> >
>
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