[TRNSYS-users] Variable global thermal conductivity

[Denis GARASA]

Thank you David for the proposition but do you think the effect on the
internal
convective heat transfer coefficient will lead to same effect than the wind
infiltration in the insulation ?
This last effect leads to a decrease of the insulation performance of the
mineral
wool. We would like to quantify the impact on the energy consumption
taking this
effect into account or not.
Your proposition will imply to translate de global U of the roof as a
function of
the wind velocity and incidence into a modification of the external and
internal
convective heat transfer coefficient.
Is there only your proposition as a solution (except creating a new type
and link it
the Type 56 as the roof façade) ?
Best regards,
Denis


> Denis,
> Type56 allows you to set the outside convection coefficient of a surface
> (walls, ceilings, etc.) as a constant value, as a scheduled value, or as
> an input to Type56. If you select "input" then you can choose whatever
> algorithm you want for the external convection from your roof. The
> physical properties of the material in the roof (density, thermal
> conductivity, and specific heat) are then constant but the convection on
> the outside (and inside if you wish) surfaces vary with external
> conditions.
> Kind regards,
> David
>
>
> On 11/3/2011 10:47, Denis GARASA wrote:
>> Hello,
>>
>> I'm a student in an engineering school.
>>
>> I study the influence of the wind on a roof and I would like to know if
>> it
>> is possible to determine a variable global thermal conductivity using a
>> Type56 building?
>>
>> Thanks in advance,
>> Denis GARASA
>>
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>>
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI  53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com
>
> http://www.tess-inc.com
> http://www.trnsys.com
>
>