[Gasification] ROCKWOOL

[Greg Manning]

Greetings Tom and List members

I've found a great source for it...

Home Depot (At least in Canada) it's marketed by a company called "Roxul"
http://www.roxul.com/ under the name "flexi-batt" or "Safe and sound" (the
later being their sound deadening version).

I just bought a bail of R22 16" wide (5 1/2" thick) for the newest project
I'm working on CDN $ was in the 21.00 mark for 8 chunks 47" long.

Greg Manning


-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org]On Behalf Of Thomas Reed
Sent: Thursday, January 11, 2007 5:59 PM
To: Frans Peeters
Cc: Martin Boll Dr; GASIFICATION; 'AJH'; STOVES at LISTSERV.REPP.ORG
Subject: [Gasification] ROCKWOOL


Dear Frans and All:

Thanks for replying to my Rockwool questions.  I found the discussion of
thermal properties below on the web.

It is often made from slag (already melted, right composition, should be
cheap) and was widely available in the US 50 years ago.  My impression
is that we now use fibreglas instead (peak temperature 500C, relatively
cheap) or Kaowool (many names) (made from spun al silicate, peak
temperature 1600 C, VERY expensive) and can't get Rockwool (peak temp
1000 C) produced in the US.  Rockwool would be adequate for most stove
and gasifier applications.  Also seems to be good for agricultural
applications that Kaowool wouldn't fit. PRobably the iron content.

Any comments on where to get it?

Yours truly, TOM REED             BEF










Rockwool products provide excellent and long-lasting thermal insulation
performance. Thermal insulation resists the flow of heat and by reducing
heat flow saves energy for heating and cooling. Products of our
manufacturing provide energy conservation and reduction in heat loss
from installations of high temperature of up to 750°C (the mineral
fibers can withstand more then 750°C without melting, whereas the
binding agent start to evaporate at temperature in excess of 450°C).
These products are mainly used in the process industries, petrochemicals
& refineries, fertilisers, paper, cement, thermal power stations -
boilers, turbines, chimneys, receptor of sun-heated boilers, etc.

Rockwool insulation products also play a significant energy-savings role
in homes, commercial and office buildings, by reducing heat flow (70% -
80%).  A properly insulated construction uses less energy in winter for
heating and less in the summer for cooling.

Rockwool insulation products are also provided for areas of low
temperature. The areas of applications under this would be insulation of
chilled water lines in hospitals, hotels and commercial buildings,
air-conditioning and refrigeration ducts, pipes and equipment in
chemical, dairy, food industries etc.

Following is the thermal conductivity of the rockwool slabs at different
densities as a function of temperature:

*Mean
Temperature*
*°C*

*40kg/m3*

*60kg/m3*

*80kg/m3*
*
_     W     _
mh oC*

*
_     W     _
mh oC*

*
_     W     _
mh oC*
50

0.042

0.041

0.041
100

0.054

0.048

0.046
150

0.065

0.058

0.055
200

0.085

0.065

0.064

The following graph shows the heat conductivity of our products as a
function of temperature and the rockwool density.



*Planning Instructions*
The thickness of the insulation that should be used will vary, depending
on the temperature of the installation to be insulated and the
requirement from the insulation. Following is auxiliary table for
selecting insulation thickness based on temperature and requirement from
the insulation:


*THICK *

*-NESS *



*25 mm *



*50 mm *



*75 mm *



*100 mm *



*125 mm *

*Temp. of the Warm Side*

*(^0 C)*



*Loss of Heat*

*_K-Cal_*_ _

*h * m**^2 *



*Outer Temp.*

*(^0 C)*



*Loss of Heat*

*_K-Cal_*_ _

*h * m**^2 *



*Outer Temp.*

*(^0 C)*



*Loss of Heat*

*_K-Cal_*_ _

*h * m**^2 *



*Outer Temp.*

*(^0 C)*



*Loss of Heat*

*_K-Cal_*_ _

*h * m**^2 *



*Outer Temp.*

*(^0 C)*



*Loss of Heat*

*_K-Cal_*_ _

*h * m**^2 *



*Outer Temp.*

*(^0 C)*

100



96



33



51



32



34



31



26



30









150



173



41



94



38



64



34



48



32









200



266



50



143



46



99



38



74



36









250



372



61



200



49



137



43



104



39









300



495



71



259



55



177



47



158



42









350











390



57



221



52



196



47









400











401



70



274



58



206



50









450











475



73



324



60



246



52



179



46

500











530



78



364



63



276



55



202



50

550











625



85



425



69



322



60



258



54

600











720



94



491



74



373



64



300



58

650











830



100



566



80



428



69



312



62





Frans Peeters wrote:
> Dear TOM,
>
> Before making place in the PC MEM
>
> I do not remembering ,an answer to you .
>
>        Rockwool I use in 600° C accumulation EL heating . Night
> current cost 2,3 times less than day current.
> 600 Kg Al2O3 bricks takes 7,5 KWh X 8 +2 h / day as standard heating
> in a room 4x9 mX 2,5high .
>        Wood cassette ,(self constructed / window 40X70 cm ) is
> secondary heating for burning own wood .from my garden .
>
>        Burning ,in the drowing IDEA is in the space between 2 grates
> of differend mesh ! + around the bottom from the returning woodgass .
> I did tests with sums of stainless mesh grates and ash size in my
> cassete stove .
> Burning wood will produce hot charcoal between the 20-30 mm grates
> space .  Upper holes 20 mm under 5mm .
>
> Hoping it is clear now
> Greetings Frans
>
> -----Oorspronkelijk bericht-----
> *Van:* Thomas Reed [mailto:tombreed at comcast.net]
> *Verzonden:* woensdag 16 augustus 2006
> *Onderwerp:* Re: Best posible GASIFIER WOODSTOVE ? P+S air preheating
> . Tangenial flow . Speed controls . Lambda sensor in exhoust . Peepscope .
>
> Dear Frans:
>
> The diagram isn't clear, but it looks like you are heating the fuel
> indirectly through a wall.  This is much more complicated than needed
> as you will see in our WoodGas stoves.  (Woodgas.com).
>
> Do you really use Rockwool?  I have been looking for some.   Kaowool
> withstands 1600 C, Rockwool ~900C, but is much cheaper.
>
> Yours truly,
>
> TOM REED
>
> Frans Peeters wrote:
>>
>> Dear Stovers ,
>>
>>     Did I forget someting ?
>>
>> 5 termocouples ,displays and regulator are details .
>>
>> Greetings
>>
>> Frans
>>
>>
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