[Greenbuilding] ERV Issues

[Gennaro Brooks-Church]

Hi,
I am not sure what leg should be better for in or out. I would super
insulate both. The goal is for the unit to do the heat transfer and
not the pipes going to it.

Gennaro Brooks-Church

Cell: 1 347 244 3016 USA
www.EcoBrooklyn.com
22 2nd St; Brooklyn, NY 11231




On Thu, Nov 4, 2010 at 2:35 PM, elitalking <elitalking at rockbridge.net> wrote:
> Thanks for your input on HRV versus ERV.  I really enjoyed the discussion
> that followed concerning the health impact of humidity.  I gained new
> knowledge from that series.
>
>
>
> Steven Tjiang writes:
>
> Your analysis seem correct for your climate.  If there is no active source
> of moisture removal an ERV would only delay the inevitable equalization of
> humidity between the external and the internal.
>
>
>
> I have decided to install ERV, even though I am not immediately planning to
> install the active moisture removal to take advantage of the ERV’s ability
> to preserve that value.  I decided to preserve the option of installing
> active moisture removal such as a mini-split heat pump.  Living in a wooded
> location, with upgraded thermal efficiency from tighter and higher
> conductive insulation, I have the potential for grid tied photovoltaic array
> in field where there is full sunshine to produce the electricity credits in
> summer to pay for heat in winter.
>
>
>
> The next issue what ERV to use.  My house is small.  Using ASHRAE formula
> for required ventilation = (.01cfm/sf x Area(sf)) + 7.5cfm/occupant x
> #occupants), I only need 22cfm.
>
>
>
> Is there a source of information for comparing the performance of various
> manufacturers and models?
>
>
>
> Efficiency of recovery and reliability are important factors.  Rcomendations
> will be appreciated.
>
>
>
> I am considering
>
> * Fanteck 5504.153 SE 704N Compact ERV
>
> * Panasonic ERV FV-04VE1
>
> * Renew air model to be determined.
>
>
>
> I spoke with an engineer recently that recommended Renew Air Energy Recovery
> Flat Plate HX.  He told me that some ERV’s with desicant wheels have leakage
> between air flows and maintenance issues caused by bearing and seal of
> wheel.  The ERV he recommended has some different method of transferring
> humidity that flows over plates.
>
>
>
> 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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