[TRNSYS-users] problem of windows and layers definitions

[Pauline GELIN]

Hello,

Using TRNSYS and TRNBUILD for many projects in our office, we have two basic questions with no answers in manuals or forum:


-          Concerning the definition of a window, we would like to know if Ug presented in the library already includes convective heat transfer coefficients (if so what value?) and the standard to which it is calculated ?

o   Is this the exact value which is then used to calculate the Uw overall coefficient window (taking the frame, the choice of spacer and also the precise convective heat transfer coefficients asked)?

o   How these coefficients are they mathematically used (only for the frame or also for the glazing already impacted by other coefficients if I’m right)?



-          Concerning values of layers, and especially insulation materials, it seems that the user library saves only two decimal places for conductivity. If we specify three digits, the value is rounded and if we add manually three decimal places in the file (opened by a notepad), only the first two are considered. How can we fix this?
Indeed, to convert and distinguish accurately conductivity values ​​for materials, it is necessary to have three decimal places.

Thank you very much for your help.

Best regards,

Pauline Gelin
Fluid and Environmental design engineer


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KATENE

10 avenue des Canuts – 69120 VAULX EN VELIN
0437453347



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