[TRNSYS-users] problem of sky temperatures

[ITF - Adrien JEZEQUEL]

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
*ITF*
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FRANCE
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a.jezequel at itf.biz ou aj at itf.biz

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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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