[TRNSYS-users] problem of sky temperatures

[David BRADLEY]

Pauline,
   In addition to Adrien's response, the sky temperature model that is 
implemented in Type15 (when reading meteonorm files for example) is the 
same one that is in the TESS Type575.
Best,
  David


On 8/22/2012 08:22, ITF - Adrien JEZEQUEL wrote:
> Hi Pauline,
>
> This subject was ever treated in the past :
> https://mailman.cae.wisc.edu/pipermail/trnsys-users/2009/004373.html
>
> Different models exist to evaluate sky temperature. That's why you may 
> find differents values.
> Meteonorm software use SoDa/ESRA clear sky model.
>
> In trnsys, you may use  :
>
>   * type69a : cloudiness factor is not controled by user
>   * type69b : cloudiness factor is an input of the type
>   * type575a and type575b (In TESS library only)
>
> If you compare sky temperature given by meteonorm data and sky 
> temperatures given with type69b with the same cloudiness factor as 
> meteonorm data, results won't be so different.
>
> Best regards
>
> ------------------------------------------------------------------------
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>
> 	Adrien JEZEQUEL
> Simulations Thermiques Dynamiques
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> Le 22/08/2012 11:17, Pauline GELIN a écrit :
>>
>> Hello,
>>
>> For a project I would like to check if the effective sky temperature 
>> done by the weather type 9 (Meteonorm) is the same than the 
>> temperature calculated in the type 69 (with 4 inputs from the type 9).
>>
>> In fact there are different.
>>
>> How can we explain that whereas there is the same descriptions?
>>
>> Thank you very much for your answers.
>>
>> Best regards,
>>
>> Pauline Gelin
>>
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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

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