Thank you for your answer. Indeed, I read these differences in the manual but I don’t know for which case we need to use one or other of these sky temperatures definition. In fact, I have another question about the effects of the value view factor given for walls and windows. According to TRNBUILD manual (page 72), the view factor must impact diffuse and long wave radiation as well as convective heat transfer coefficients, so it is especially important for windows. When I wanted to check these impacts using the IDSHAD outputs (total diffuse radiation on outside of external surface) with differents values of view factors (equal to 0 or 0.5 or 1) for walls and windows, I saw no difference in the results. Could you explain to me these results ?Should I use another outputs to check these impacts? Am I wrong or right ?Is my understanding of the view factor false? Thanks a lot in advance for your answers. Best Regards, Pauline GELIN Ingénieur Conception environnementale 10 avenue des canuts 69120 VAULX EN VELIN T : 04.37.45.33.33 Ligne directe : 04.37.45.33.47 De : David BRADLEY [mailto:d.bradley@tess-inc.com] Pauline, On 9/18/2013 08:40, Pauline GELIN wrote:
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