[Greenbuilding] ERV strategy

[Steven Tjiang]

A running ERV will still remove moisture from a house, just not as fast as
an HRV or an exhaust fan.  ERVs slow down the increase in humidity in a well
sealed house when the exterior humidity exceeds that of the interior; and
decrease in humidity when interior humidity exceeds that of the exterior.

---- Steve (KZ6LSD)


On Sun, Oct 3, 2010 at 6:44 AM, sat jiwan ikle-khalsa <
satjiwan_khalsa at hotmail.com> wrote:

>
> > From: Alan Abrams <alan at abramsdesignbuild.com>
> > To: ArchiLogic at chaffyahoo.ca
>
>
> > > Don't know nuttin' about nuttin' about ERVs (because MooseLand is HRV
> > > Country but...
> > >
> > > Assuming that the ERV is functioning similarly to an HRV in MooseLand
> >
> > NO MOOSE IN SLIGO CREEK, BUT HERE WHERE THE DEER SWARM LIKE STARLINGS,
> AND
> > SUMMER R/H AND TEMPS EXCEED THE 90'S, THE ERV REMOVES SOME WATER VAPOR
> FROM
> > INCOMING FRESH AIR
> >
> >
> > BUT EVEN DURING THE SHOULDER SEASONS YOU WOULD WANT TO MECHANICALLY
> > DEHUMIDIFY THE BATHROOMS
> >
> > > ie the heating and cooling elements would cycle on and off as heating
> or
> > > cooling demand dictates but wouldn't the ventilation air demand remain
> > > somewhat constant (ie except for those times when the fans kick into
> high
> > > speed during a moisture or odour event) ?
> > >
> >
> > JUST TO CLARIFY, THE ERV'S UNDER CONSIDERATION ARE TWO STAGE.  DURING
> TIMES
> > WHEN THE MAIN SYSTEMS ARE REQUIRED, THE ERV WOULD RUN AT LOW SPEED, AND
> > WOULD BE KICKED UP BY A TIMER SWITCH IN EACH BATHROOM.  DURING SPRING AND
> > AUTUMN, THE ERV WOULD BE RESET TO OPERATE MANUALLY ONLY, USING THE TIMER
> > SWITCHES.
>
> aren't we getting caught up in the fallacy that ERV's dehumidify?  they (at
> least mine) don't have a condensate drain to "remove" humidity.
>
> - my understanding (and please correctmr  if wrong) is that the HRV does
> fresh air exchange while maintaining conditioned heat (at about 75%
> efficiency, usually in colder, dryer climates).
> - the ERV does fresh air exchange while maintaining whatever conditioned
> temperatures (heat and cool) AND also doing something with latent heat in
> the humidity differential inside and out.  (i.e. it helps maintain whatever
> humidity you have inside - achieved with separate air conditioners or
> dehumidifiers-- but does not actually change the humidity of the indoor air.
>  just does it's best to make the outside air just as humid as the indoor
> air).
>
> so putting them on a bathroom doesn't make sense to me.  extra humid air in
> there will be equalized with incoming fresh air and tend to KEEP that
> humidity inside the house.  why is it that people use them there?
>
> ~ ~ ~ ~ please use my permanent email address:
> satjiwan at alumni.brandeis.edu ~ ~ ~ ~
>
>
>
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