[GSBN] Heat storage capacity of wall systems.

[August Hasz]

I didn’t see John’s reply before this went out. His numbers put a finer point on my quick off-the-cuff generalizations.

Thanks, August

August Hasz, P.E.
President
REG
Resource Engineering Group
Direct: 970.713.0984
Cell: 970.275.3603
hasz at reginc.com <mailto:hasz at reginc.com> 
www.reginc.com <http://www.reginc.com/>

> On May 2, 2019, at 10:56 AM, August Hasz <hasz at reginc.com> wrote:
> 
> Lars- 
> 
> To do a comparison of this one single aspect of the insulation options, you need to compare the heat capacity (typically listed as energy stored per unit weight)+ the weight of the different materials. Resistance to heat transfer (R-vlaue or U-value) is typically the most important characteristic to consider. This is pretty straight forward math to do if you have access to the thermal properties of the materials being considered. With natural materials getting an exact reading can be a bit difficult because changes in moisture content (particularly for straw, wood and other organic properties) will alter the heat capacity, with and resistance to heat transfer significantly, but you should be able to find some general average values to use in a comparison. 
> 
> The story of how this unfolds in buildings is a big more complicated though because we need that mass to be ‘active’ to be of use. For example, a similar thickness of some wood products will store as much heat as that thickness of concrete because of the difference in heat capacity, but concrete will release this heat more quickly, so if we are purely considering heat storage the concrete is likely superior BUT wood is of course renewable, has lower embodied energy and in many applications the increased resistance to heat transfer is a plus. 
> 
> Is that helpful at all?
> 
> Thanks, August
> 
> August Hasz, P.E.
> President
> REG
> Resource Engineering Group
> Direct: 970.713.0984
> Cell: 970.275.3603
> hasz at reginc.com <mailto:hasz at reginc.com> 
> www.reginc.com <http://www.reginc.com/>
> 
>> On May 2, 2019, at 6:37 AM, Lars Keller <larskeller at gmail.com <mailto:larskeller at gmail.com>> wrote:
>> 
>> We have a discussion in Denmark where some people argue, that if you compare two walls with similar insulation values, one being insulated with mineralwool, and one with wood cellulose or paper cellulose, then the wood cellulose option can retain / contain more heat thatn the mineralwool solution.
>> 
>> The advantage of this for the wood cellulose is, that this solution is then capable of absorbing more heat when there is eg more solar influx, and later release the heat into the room again, thus creating more comfort. I assume that this is a result of the cellulose option being heavier than the mineralwool option.
>> 
>> I would like to hear thoughts about whether my understanding is correct.
>> 
>> I assume straw would share the benefit of the cellulose option.
>> 
>> Does anyone know if we have / there is numbers to back this up ?
>> 
>> Best, Lars
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