[Stoves] question about longevity Re: concrete rocket stoves

Tue May 13 11:54:02 CDT 2014

Dear Michael N Trevor,

I learn that neither metals nor local concrete are lasting materials in 
this environment. With anticorrosive coating (new reflector materials 
are coated) there may be some advancement.

But as you are near the equator you have the advantage that polar 
mounting of solar systems is easy to install. Maybe simple solar 
concentrators in form of light weight Fresnel lenses (made from durable 
plastic material) can be applied?

With kind regards,
Dieter

Am 14.05.2014 07:52, schrieb Michael N Trevor:
> Thanks you for the response.  Decades would be wonderful but in todays world is very unrealistic, and in the environment here impossible.  Here at 5/6 feet above sea level  80 degrees F plus 100 percent humidity and constant salt even stainless steel does no last.  Broken coral aggregate and foraminiferous sand simply do not make a concrete that can tolerate fire. WWII armored tanks do not even exist as rust spots on the reef.   On a coral atoll there is nothing to use  except calcium carbonate and humus. Everything else is imported at a cost many can not pay.
> In reality here 2/3/4 years is a miracle  unless built to standards no one can afford.  A solar reflector would be corroded beyond use in 12 to 24 months.
> They were tried and trashed, after the steel legs rusted and collapsed leaving the reflector propped up on pieces of wood. The condensed moisture in say gas or kerosene from simple daily expansion and contraction rusts out tanks in couple years.
>
> Without a cost effective viable alternative people will go back to the 3 stone fire. It worked for grandma, it worked in the 19th century and it worked a thousand years ago.
> Michael N Trevor
> Majuro
> Marshal Islands
>
>
>
> From: Dr.-Ing. Dieter Seifert
> Sent: Tuesday, May 13, 2014 2:41 AM
> To: Discussion of biomass cooking stoves
> Subject: [Stoves] question about longevity Re: concrete rocket stoves
>
> Dear Michael N Trevor,
>
>   
>
> Are we not supposed to strive for a durability of our cookers in the range of decades to avoid that there is a continuous production of waste? So I want e.g. to pass my parabolic solar cooker to my grandchildren as it is not degraded during many years of intensive usage.  And one day, after decades, they may repair it or recycle it.
>
>   
>
> With kind regards
>
> Dieter
>
>
>
>
> Am 14.05.2014 04:37, schrieb Michael N Trevor:
>
>    Re-asked--
>
>
>    There are wide variety of rocket stove designs shown on various YouTube movies.
>    Primarily variations on stacked hollow blocks or 6 gallon buckets with a removable PCV elbow.
>    both types have the distinct advantage of being simple inexpensive and quick to make.
>
>    However does anyone have any actual longevity information?
>    For instance Quickrete in the 60 pound bag is a nice mix of cement, hard sand and nice small pebbles which with should make a nice
>    dense concrete. As configured the sample stove has about a base 2 inches thick, and  4 inch walls. Could this be expected to last a few weeks,
>    a few months or even a year or more. The bag of cement here cost a little over 7.00 with tax. With propane costing a 1.00 plus even 2.00
>    Return on investment is a week, however making a new stove weekly just does not cut it.   Some might it consider if the stove lasted 6 months.
>    If it can be a year or so it could be feasible especially if it they were already made and available.
>    This issue of longevity could be important.  I will be able to answer this myself in the future as I all ready made two.  But if some one can answer in advance it would be appreciated.
>
>
>    Michael N Trevor
>    Majuro
>    Marshall Islands
>
>
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