[TRNSYS-users] TRNSYS ground temperature

[David BRADLEY]

Sven,
   I have done a good bit of searching for algorithms to determine 
ground surface temperature and there doesn't seem to be anything very 
general; it is too dependent on gound cover. If you had a situation 
where the ground surrounding a building were uniformly covered by 
something that does not absorb much moisture (like a parking lot for 
example) then I think you could make an approximation based on the 
emissivity of the pavement.

  In all of the other simulation programs that I have looked into, if 
they calculate radiation losses to the ground at all, they simply use 
the ambient temperature as the ground temperature.
Kind regards,
  David

On 9/9/2011 12:34, Sven Böttcher wrote:
> Hello everybody,
>
> I'm using TRNSYS 17 and I'd like to use the surface temperature of the
> ground (TSGRD) of Type 56.
> But I can't find any information in the TRNSYS 17 documentation about the
> computation of the long wave radiation heat flux
> to the outside wall surface (q_r,s,o).
>
> Is there an updated documentation or does anyone know something about the
> computation of q_r,s,o?
> I'd like to know the emissivity of the outside ground surface, for example.
>
> Thanks a lot and best regards
> Sven
> ---
> Sven Böttcher
> Diplom-Informatiker
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>
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>
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