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Dear Adnan, your approach makes sense to me. TRNSYS does calculate heat transport for each time step and is not using a fixed U-Value. Which TRNSYS outputs did use for
q= convective and radiative heat loss ? I guess that using a wrong output could have coused your problem… Sincerely yours _________________________________________________________________________________________________ Jakob Merk TRNSYS Software Team
Curiestraße 2 70563 Stuttgart Fax: +49 711 67976-11 Web: www.trnsys.de
Von: TRNSYS-users [mailto:trnsys-users-bounces@lists.onebuilding.org]
Im Auftrag von adnan rasheed hi everyone, i have one question i am stuck with this problem. 1- i want heating a room having one window, by using type 56 inside temp = 10, 20, 30,.... dry bulk temp= ambient temp = outside = 0 sky temp = 0 and -20 i wanna see the change in overall heat transfer coefficient = u-value of glazing (window) by changing inside temperature using this equation U = Q / A(T) where U = U-value q= convective and radiative heat loss A = Area of window T = ambient and inside temp difference. i get results but TRNSYS giving me almost the same value of U for all temp difference. trend is not same as experimental U-value trend according to change in inside temp. anyone please help me with this is it possible to calculate U-value of window like this. or trnsys use fix U-value for the calculation of heat load. thanks in advance. for killing your time. Regards Adnan |