[GSBN] Modeling or measuring mass effect of interior plaster

Tue May 28 06:28:50 UTC 2013

Hi

We have a good (searchable) overview in GERMAN on building-materials  
and their properties on the website http://www.ib-rauch.de
As the numbers are international, you just have to translate the names  
of the materials:-)

I summarized the most important materials used in sb-building in this  
html:

all the best
Herbert Gruber
-----------------
asbn - austrian strawbale network
3720 Ravelsbach, Baierdorf 6
Tel. 02958-83640
asbn at baubiologie.at
www.baubiologie.at

Am 28.05.2013 um 04:46 schrieb Graeme North:

> Hi - this chart looks great - has anyone got something similar in  
> metric units by any chance?
>
> cheers
>
>
> Graeme
>
>
> On 14/05/2013, at 8:53 AM, Derek Stearns Roff <derek at unm.edu> wrote:
>
>> Robert Riversong provided me with the chart below, which combines  
>> all the relevant factors, to come up with a Thermal Mass Index.   
>> Soapstone is the winner by a large margin, so plaster your bales  
>> with soapstone.  Saturated sand is next in line, which would make a  
>> great plaster.  Marble is good.  Clay isn't great on this list, but  
>> it has so many other virtues that it is my first choice.
>>
>> Derek
>>
>>
>> <Thermal Mass Material Qualities.jpg>
>>
>>
>> On May 13, 2013, at 9:17 AM, Van Krieken wrote:
>>
>>> Thermal mass, like insulation, its a general expression, but in  
>>> fact "thermal mass depends on the type of material we use.
>>>
>>> It is important to know what are the properties and thermal  
>>> performances of the materials we want to use, because each of them  
>>> have their own thermal characteristics.  Due to their structure  
>>> and their mass they manage the heat in different ways:
>>>
>>> a) Statics: conductivity or thermal capacity. How does the  
>>> material reacts to a thermal flow, independently of the reaction  
>>> time?
>>> b) Dynamics: diffusivity and effusivity. At what speed the  
>>> material manages the thermal flow?
>>>
>>> Because the exterior conditions are going to determine the  
>>> interior changes, its essential to know how the materials react.  
>>> Iron and clay, both thermal mass, react in a very, very different  
>>> way.
>>>
>>> 1. The thermal conductivity (lambda) gives us the information  
>>> concerning the amount of insulation a material can achieve (air  
>>> passage of calories).
>>>
>>> 2. The thermal capacity, measures its aptitude to stock the heat.  
>>> This is the key element to stock the heat in winter, as well as to  
>>> absorb the heat in summer. They are not only heavy materials (like  
>>> clay or stone, or cement). Straw, a much more light material, has  
>>> also a thermal capacity, and therefore thermal mass.
>>>
>>> 3. The thermal diffusivity is the measure of thermal inertia and  
>>> it increases with the conductivity and decreases with the thermal  
>>> capacity. In a substance with high thermal diffusivity, heat moves  
>>> rapidly through it (m2/hour).
>>>
>>> 4. The thermal effusivity measures its capacity to exchange its  
>>> thermal energy with the environment. The more the effusivity is  
>>> high, the more the material absorbs energy without warming up  
>>> significantly. In contrary, the more the effusivity is low, the  
>>> faster the material warms up.
>>>
>>> Obviously, the thermal mass importance of a material depends on  
>>> these characteristics, but we can help the final result with some  
>>> technology. If in a hot climate I do not have a significant  
>>> difference of temperature at night, then I can get 11 or 12º C of  
>>> fresh air from the soil (foundations), colling the thermal mass;  
>>> or I also can run 19ºC water in radiant walls made of clay. The  
>>> same we can do on winter, stocking the heat on the clay walls.
>>>
>>> What is the best material for thermal mass? I do not have a  
>>> scientific knowledge to tell it, but I like to think that "clay"  
>>> -- this thermally lazy natural and beatifull material -- is the  
>>> answer.
>>>
>>> The simple issue -- my karma its to arrive allways to a easy  
>>> conclusion... -- it's how  to use it to keep the heat in cold  
>>> seasons, and what to do, to cool it in hot seasons. That's it.
>>>
>>> All the best
>>>
>>> Jorge Van Krieken
>>> Portugal
>>>
>>
>> Derek Roff
>> derek at unm.edu
>>
>>
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