[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TRNSYS-users] (no subject)



fatema najate wrote:
*hello;*

I m simulating a house built out of earth with a type 56, and for wall thicknesses > 30cm the results are not ‘good’. I have tried to change the subroutine that calculates the transfer function coefficients but I do not succeed; how can I do this? IS there another way that solves the problem?**

Type 56 is known to have a problem to calculate the wall transfer functions of very thick (massive) walls. If you are using a time base that is less than 1 hour, you can try using 1 hour since this will usually give good results even if your simulation uses a shorter time step. If you are already using a "large" time base, one workaround is to split the wall in two identical parts separated by a fictitious zone. Set the convection coefficient to a very high value in the fictitious zone, and its volume to a very small value. I am not aware of any problems related to that technique except for the fact that it's not as convenient as being able to define the wall directly.

Kind regards,

Michaël Kummert



------------------------------------------------------------------------
Découvrez le nouveau Yahoo! Mail : 250 Mo d'espace de stockage pour vos mails ! Créez votre Yahoo! Mail <http://fr.rd.yahoo.com/mail/taglines/*http://fr.rd.yahoo.com/evt=25917/*http://fr.rd.yahoo.com/mail_fr/mail_campaigns/splash/taglines_250/default/*http://fr.promotions.yahoo.com/mail/creer28.html>


------------------------------------------------------------------------

_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@engr.wisc.edu
https://www.cae.wisc.edu/mailman/listinfo/trnsys-users


--
_________________________________________________________

Michaël Kummert

Solar Energy Laboratory - University of Wisconsin-Madison
1303 Engr Res Bldg, 1500 Engineering Drive
Madison, WI 53706

Tel: +1 (608) 263-1589
Fax: +1 (608) 262-8464
E-mail: kummert@engr.wisc.edu

SEL Web Site: http://sel.me.wisc.edu
TRNSYS Web Site: http://sel.me.wisc.edu/trnsys