[GSBN] Heat storage capacity of wall systems.

[Lars Keller]

Hi all,
What an amazing network to be a part of. I am humbled. What an antidote to
Brexit and the likes.

The last four years I have been working with the SIPS - Structural
Insulated PanelS - called EcoCocon.
>From that network I have received the below contribution.
Best, Lars

- - -

For heat accumulation, usually only 6-7cm of the surface can be used in the
calculation.

I made a calculation with a German software that is possible to use for all
kinds of constructions. As you can see on page 4, the amplitude attenuation
is above 100, so phase shift is like very good.

The value listed for heat capacity is 174KJ/m2K for the complete
construction and 100KJ/m2K for the inside surface. (page 4 bottom).

- Yes, heat capacity does not have a large impact on heat demand
- Most solar gains can be stored even in lightweight construction, it is
not so important what the sun hits. In more lightweight construction, the
room temperature will increase more than in heavy construction (larger
amplitude) The storage is in the material is largely the same, slightly
better in heavy construction. But if you have large windows and lightweight
construction, expect room temp to go to uncomfortable heights even in
winter.
- Heavy construction and good accumulation is very good in summer if you
want to use night ventilation to cool the house, and then keep the interior
cool during the day (needs very good shading).
- Having a long phase shift over 12hours is very good in summer to protect
against heat spikes.

So summary:
WINTER: EcoCocon insulation values are crucial, and heat capacity is medium
but this does not have any large impact anyway
SUMMER: EcoCocon insulation values are crucial, but heat capacity and phase
shift characteristicts are great and help keep the house cool (if very well
shaded and you can cool the building through night ventilation.)

This calculation was made at U-wert Rechner freely available here:
https://www.ubakus.de/u-wert-rechner/? I did not know it was possible also
in english. It is not a WUFI calculation that can include capillary
conductivity of the materials, so moisture calculation here only an
approximation...I  have added that information in the first comment

Here an english version:


<https://storage.3.basecamp.com/3276374/buckets/941268/recordings/1770845902/email/download/BAh7CEkiCGdpZAY6BkVUSSIoZ2lkOi8vYmMzL0Jsb2IvMTM4ODYwMjcyP2V4cGlyZXNfaW4GOwBUSSIMcHVycG9zZQY7AFRbB0kiCmVtYWlsBjsAVGwrB872jGlJIg9leHBpcmVzX2F0BjsAVDA=--c1345423fd7bd3840049672614e2c807ae66530d/EcoCocon_EN%20Ubakus.pdf>

EcoCocon_EN Ubakus.pdf 523 KB • Download
<https://storage.3.basecamp.com/3276374/buckets/941268/recordings/1770845902/email/download/BAh7CEkiCGdpZAY6BkVUSSIoZ2lkOi8vYmMzL0Jsb2IvMTM4ODYwMjcyP2V4cGlyZXNfaW4GOwBUSSIMcHVycG9zZQY7AFRbB0kiCmVtYWlsBjsAVGwrB872jGlJIg9leHBpcmVzX2F0BjsAVDA=--c1345423fd7bd3840049672614e2c807ae66530d/EcoCocon_EN%20Ubakus.pdf>


-- 
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Small Planet
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Kontakt-info
skype
jomorandin
lars.friland
jomorandin at gmail.com
larskeller at gmail.com

Home +45 8668 0505
Jo      +45 2390 0924 (mobile/handy)
Lars   +45 2024 0505 (mobile/handy)

Jo Morandin, Jamilla, Asger & Lars Keller
Friland 12 B
8410 Rønde
Danmark
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