Dear Pauline,
If you use the type 9, you have 2 ways of thinking :
- If you want the type read exactly the value of your file, you have to set 0 for the parameter “Average or instantaneous” (0 for average)
- If you want the type get the average between 2 values, you set 1 (instantaneous).
It seems strange but it can be explained by the fact that TRNSYS use the value defined for 1 time step, so when you define the value like an “average”, TRNSYS use it directly (this value is OK for 1 time step long) and when you define the value like an “instantaneous value” (for example 17 at 7am and 19 at 8am), TRNSYS has to get the average (18) for the time step calculation (between 7am and 8am).
I don’t know if it is clear enough and I hope it will help you.
Regards,
Vincent COSTE
AMOES
vincent.coste@amoes.com
www.amoes.com
Tél : 01 41 32 22 11
Fax : 01 40 86 29 16
31 rue bapst
92600 Asnières sur Seine
De : Pauline GELIN [mailto:p.gelin@katene.fr]
Envoyé : mardi 21 août 2012 08:27
À : David BRADLEY; Matt Duffy <duffy@tess-inc.com> (duffy@tess-inc.com); trnsys-users (trnsys-users@cae.wisc.edu)
Cc : Vincent MORELLE; Amélie MARILLER
Objet : [TRNSYS-users] definition of TRNSYS's outputs for temperature
Dear TRNSYS users,
Further to my previous mail, you can find attached, indeed we saw that the temperatures given by TRNSYS are the average of the desired values between two time steps.
In our projects, such results are detrimental:
- for example when we count the number of hours above a certain value
or even when we show on a graphic the temperature curve of a day with desired setpoint temperatures as TRNSYS’s outputs of temperature don’t match with these setpoints.
Knowing that the software has the right information of temperature at time X, why could not it give us this information rather than the average time between the time X-1 and time X ?
Does anyone already have these problems? How did you fix them ? Do you know if we can have these instantaneous values by choosing an option somewhere in the software?
Thanks a lot for your answers.
Best regards,
Pauline Gelin
Fluid and Environmental design engineer
| KATENE 10 avenue des Canuts – 69120 VAULX EN VELIN 0437453347 |
De : Pauline GELIN
Envoyé : mercredi 16 mai 2012 16:38
À : 'David BRADLEY'; 'Matt Duffy <duffy@tess-inc.com> (duffy@tess-inc.com)'; 'trnsys-users (trnsys-users@cae.wisc.edu)'
Cc : Amélie MARILLER; Vincent MORELLE
Objet : RE: problem of windows and layers definitions
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 ?
Thank you very much for your help.
Best regards,
Pauline Gelin
Fluid and Environmental design engineer