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Electric flr heating in passive design

Discussion in 'Home Power and Microgeneration' started by Roy Mock, Jul 3, 2003.

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  1. Roy Mock

    Roy Mock Guest

    Given a passive design with concrete floor [no carpet or timber on top], is
    it a conflict-of-interest if an electric floor heating system is installed
    so that the feet don't feel the cold floor?
     
  2. Steve Spence

    Steve Spence Guest

  3. Roy Mock

    Roy Mock Guest

    Wood fuel heaters are banned where I am [for air pollution reasons I think].

    I haven't heard of solar heated water floor heater suppliers. Interesting
    thought though. There is no guarentee of solar access in suburban urban
    areas in valleys. That you mention wood backup indicates that it may not be
    efficient. I suppose we could use gas backup instead - would sugest gas
    boosted solar hot water? or on a separate system?

    Otherwise electricity is client choice because of advertising by local
    suppliers.

     
  4. Guest

    I think we all need to reread that sentence and understand the
    implications.
    Is there any way you can sign up for a "time of use" plan for your
    electricity? Here, I can get off-peak-time electricity for 1/6th of
    the daytime rate, so it makes sense for me to heat with electricity at
    night and on weekends, and with propane during the days. It's simply
    a case of a timer/switch to turn off the electricity when it's expensive.
    Not sure if that helps, if you can't buy your electricity that way.
    Your slab can reasonably be warmed at somewhere around 1 degree per
    hour (a vastly oversimplified guess but close enough to make the point),
    so you can store quite a bit of heat in that thermal mass.

    Dave Hinz
     
  5. Roy Mock

    Roy Mock Guest

    Yes, we have off-peak rates.

    Thnx for your reply.
     
  6. Steve Spence

    Steve Spence Guest

    I mention wood backup because for about 5 months in my climate there isn't
    enough sun to overcome the cold weather. wood banned for pollution reasons?
    how silly. they pollute less than an oil boiler. maybe your code people have
    not heard of epa approved stoves, or gasification.

    --
    Steve Spence
    www.green-trust.org
     
  7. Richard P.

    Richard P. Guest

    I lived in a small town where annual rainfall is measured (almost) in
    metres. Wood burning heaters are the primary source of heat due to the fact
    that we were surrounded by vast amounts of forests and clear cuts... you
    could get your wood for free, as opposed to paying $300 - $400 per month in
    electricity by using the baseboard heaters. Quite often the town was
    covered in a haze of wood smoke, and I can remember a few times when it was
    so thick I thought the fog had rolled in! I used to have an article about
    airborne wood smoke particulates, and studies showed that the (lung??)
    cancer rate was *much* higher in communities with wood burning heaters than
    those who lived within several kilometers radius of a nuclear power plant.
    Either way, it can't be healthy to be breathing it.

    This might be a viable option for remote living conditions, but I don't
    think it has an acceptable place in the urban environment. Plus, it also
    plays havoc with with some of us amateur astronomers! <grin>
     
  8. Steve Spence

    Steve Spence Guest

    Your recollections must be pre epa approved wood stoves. that behavior you
    recollect is not allowed anymore. My woodburner produces little visible
    smoke. It's much cleaner than the pollutants outputted by an oil burner.
     
  9. Steve Spence

    Steve Spence Guest

    This article of faith as you suggest (you might want to find a new line,
    this one is old) is accomplished by 1800 degree burns, which gasify the wood
    to burn clean and efficiently. My oil burner used to leave a reddish brown
    stain on the roof that this unit does not.


    http://www.woodboilers.com/wood-gasification.asp

    The combustion system employed in Solo Plus boilers solves most of the
    problems associated with conventional wood boilers and outdoor water stoves.
    Here's why: The wood gasification combustion process in the Solo Plus boiler
    begins when the small, quiet draft fan turns on in response to the boiler's
    heat controls. The draft fan blows fresh air into the top of the firebox and
    down through the wood and live charcoal bed. This hot air and smoke mixture
    is forced through a slot in the top of the ceramic combustion chamber.
    Super-heated secondary air is then injected into these gases. The
    combination of the wood gas and smoke with the high temperature oxygen
    results in a super-hot 1800° flame in the ceramic combustion tunnel. This is
    the "Wow, that's unbelievable" process we call wood gasification. The gases
    stay in this hot, turbulent environment long enough to achieve extremely
    high combustion efficiency. The resultant heat passes into the vertical heat
    exchange tubes giving off heat to the boiler water for house heating and
    domestic hot water demands. The combination of optimum combustion and
    maximum heat exchange efficiency is what yields the unusually high overall
    boiler heating efficiencies of 80-85%.
     
  10. Roy Mock

    Roy Mock Guest

    I'm in a temperate part of the country where we do not use boilers nor
    central heating. Many of the older houses have chimneys which were coal
    fuelled once-upon-a-time [coal rich area]. However wood is more commonly
    available as a substiitute these days - so is gas or oil heating (but not in
    the urban/suburban areas).
    gasification.

    Our water heaters are rated on a 5 star scale. We are trying to reduce our
    electricity consumption as most of our electricity is coal fuelled - i.e. a
    major contributor to greenhouse gases.

    [snip]
     
  11. Guest

    I don't think that in .au, they care much for our EPA's rules. And
    their politicians seem even more eager than ours to ban things,
    regardless of the logical or scientific facts.

    With his thermal mass, I'd say electric hot water on a timer is the
    way to go.

    Dave
     
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