about the sky temperature

["helmi ben rejeb" <helmi_ben_rejeb@xxxxxxxxxxx>]

Dear Trnsys users.
I’m working with the type 56, in the use of the type 69 for the 
calculation of the sky-temperature, I found strange values of this 
temperature. I have attached an excel file containing the sky-
temperature-values, calculated with the type 69 and the ambient 
temperatures.
First, the temperature change sharply at the early morning. Is it 
the influence of the solar radiation? Look at the values between the 
hours 79 and 80.
Second, the sky temperature should be very low in the summer at 
night, because the sky is very clear and there is no clouds and yet 
the sky-temperature is close to the ambient-temperature.
I will be grateful if some one can help me.
Thank you in advance.






Ing. Helmi Ben Rejeb
Ecole Nationale d'Ingénieurs 
de Tunis, BP 37, le 
bélvédère, 1002 Tunis, 
Tunisia.
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