On 21 Sep 2006 06:20:35 -0400, firstname.lastname@example.org wrote:
Furniture needs constant humidity, whole system
efficiency cannot be based on minimum regulations or
Efficiency experts are driving a lot of companies
out of business with bad advice, reduced inventories,
reduced hours, and eliminated services.
On 21 Sep 2006 13:42:05 -0400, email@example.com wrote:
Make up your mind, is it leakage, or powered mandated
air exchange. Can the right amount of leakage qualify
as a measured amount of air exchange.
Is the heat in the air being exchanged all that much,
or is most of the heat in the solid objects in the house.
Do I really need another fan running to be called
an efficient house, does that make it more efficient or
greener, cleaner or meaner?
I would like to make a suggestion about all
government regulations other than safety and security.
You really are 'reading' Nick the wrong way.
Yes, warming outside air as it enters a house lowers its RH (doesn't change
its dewpoint or specific humidity though). Yes, most people are more
comfortable with RH around 50%, and many household items such as wood
furniture are less likely to shrink/crack if the humidity is maintained.
Nick is *only* saying that you don't need to add a lot of moisture to the
air *if* you don't have a lot of air exchange. If air exchange is kept down
to a minimum, then the amount of moisture you have to add is also a minimum.
Experts/standards tell us that you *don't* need a whole-house air change
every 2 or 3 hours. *That* level of air exchange does require you to add a
lot of moisture. And that takes a lot of energy.
Reducing the air exchange rate to something a lot closer to the 'standards'
level will greatly reduce the amount of moisture that needs to be constantly
added to a house. Nick *has* said that with the minimum air exchange, the
moisture given off by people and activities will accumulate enough to raise
the humidity into the 'comfort zone'. But I think that would only be true
in mild winter climates such as his (Philidelphia).
Nick also maintains that the old wive's tail that humidifying your house
saves energy is bunk. It may feel more comfortable, but it takes more
energy to maintain that humidity level than it does to just maintain the air
temperature. Lowering the exchange rate will save energy in two ways, a) it
lowers the amount of heat lost with the outgoing air, and b) it lowers the
amount of energy needed to maintain comfortable humidity levels.
Canada says all new houses there should be equipped with an air to air
heat exchanger that ventilate the house several times a day (I forget
the actual spec)
If the outside air temp is -20F, you want to introduce as little of that
as possible to the house. Air to air heat exchangers will raise that
incoming temp quite a bit by cooling off the outgoing air.
Nope not as cheapas Nick's solution, but our Northern neighbors have
much more severe winters than most of us in the USA experience.
Even Washington state mandates a ventilation system in all new
residential construction (they don't say what it has to be just that
there is one)
YOU pointed the spec to us, NOW READ THIS PAGE
Note that this is not a MANDATORY construction method, it is a voluntary
program designed to influence both builders and consumers.
R-2000 homes will be blower door tested to ensure that the required
standard for air tightness is met.
Mechanical ventilation systems must be provided. Most R-2000 builders
use a Heat Recovery Ventilator
Note that not all R-2000 homes are REQUIRED to have HRVs, they point out
that builders who follow the spec to produce an R-2000 certified home
will often choose to include an HRV as the chosen ventilation method.
And Canada is far more than just Ontario, and Ontario is far more than
the southeastern region that lies just across the lake. Toronto
winters are very different than Chicoutimi, or Calgary, or even
locations in Ontario in the north and west regions. R-2000 addresses the
needs of the ENTIRE country.
Now it was Nick who pointed out that IDEA 2000homes in Canada leak at
2.5CFM vs 200CFM for good US houses, and now he won't even read the
pages from whence these figures were quoted!!!!!!
Aha should back at you, as if my house can be adequately conditioned
(Heated and cooled) by burying 500 feet of 6 inch diameter pipe 6 feet
below the surface and blow 300 CFM thru the pipe. In SOME parts of the
US that will work in combination with solar heat management, great
insulation.... Temperature to cool climates yes, however I do not live
in a temperate climate. AC runs a few hours EVERY SINGLE MONTH OF THE YEAR.
It just won't work. One size does not fit all!!!
Yes, very airtight, with controlled, heat exchanged ventilation HRV,
with ERVs recommended.
Get them very tight to minimize heat gain/loss as appropriate, and
introduce outside air at controlled rates with minimal loss of heated
(or cooled) air.
Energy savings of 30-40% are documented in Canada
HRVs are not required by law in every part of Canada. Some of those
airtight houses just have exhaust fans, eg R2000 houses in Ontario.
Exhaust fans waste more energy than HRVs and ERVs, but the amount of
energy isn't large, and it may not matter in a solar-heated house :-)
OTOH, the legal requirement for HRVs on Minnesota's air-leaky houses
seems to be a successful lobbying effort and a serious waste of money.
Sorry for not removing the crossposting.
People who do not get head colds will not
be able to test it. The action of moisture changes
and migration out of fabrics is very complex, and
doctors are trained to treat the human body, not
to try to understand every chemical, physical or
I never had any problem with my nose
(head cold) in Las Vegas all one summer back
when relativity was below one percent there
when the temperature was greater than 110 F.
But when I rented a pool house in Pasadena
in January and it got down to 33 degrees one night
and I turned on the gas wall heater, I got an awful
This gives the head cold sufferers something
to try, steam humidifiers (vaporizers) are available
at Walmart for less than $20, and I would give
$20 any day not to get a head cold.
I don't have to pay for doctor visits, but
many people do, so saving that expenditure is
worth some effort.
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