Re: [TRNSYS-users] problem of sky temperatures

[David BRADLEY <d.bradley@tess-inc.com>]

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

---

www.itf.biz	Adrien JEZEQUEL Simulations Thermiques Dynamiques
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	Phone : Fax : Mail:	+33(0) 479 750 029 +33(0) 479 852 122 a.jezequel@itf.biz ou aj@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

 

KATENE   10 avenue des Canuts – 69120 VAULX EN VELIN 0437453347

 

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