[TRNSYS-users] problem of windows and layers definitions

[Pauline GELIN]

Hello,

I am so sorry to insist but, despite several tests, I can not find the answers to my questions from the previous mail. Does anyone even just have an idea of quick answer ?

I also appeal to you about another problem I have with each project on TRNSYS.
When I define a set temperature at a specific time (eg 20 ° C at 7am), the temperature zones does not reach 20 ° C at 7am but an hour later.
It seems that, at 7 am, the temperature is rather than the average value between the past temperature and the set temperature.

Do you have an explanation and above all a solution to this?

Do we have to  clarify something (a field) about the component type 9,used to read the text file with the set temperatures for each hour of the year ?

Another issue related to the last, I created a schedule where the value, I want to have between six and seven am, is written at 7 am, according to the documents I thought TRNSYS read the value for the before hour. Is this true?


Thank you very much for your help.

Best regards,

Pauline Gelin
Fluid and Environmental design engineer


[cid:image001.jpg at 01CD3380.DFE10930]
[cid:image002.jpg at 01CD3380.DFE10930]

KATENE

10 avenue des Canuts – 69120 VAULX EN VELIN
0437453347





De : Pauline GELIN
Envoyé : jeudi 3 mai 2012 17:33
À : 'David BRADLEY'; 'Matt Duffy <duffy at tess-inc.com> (duffy at tess-inc.com)'; 'trnsys-users (trnsys-users at cae.wisc.edu)'
Objet : problem of windows and layers definitions


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


[cid:image001.jpg at 01CD3380.DFE10930]
[cid:image002.jpg at 01CD3380.DFE10930]

KATENE

10 avenue des Canuts – 69120 VAULX EN VELIN
0437453347



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