[TRNSYS-users] (no subject)

[Michaël Kummert]

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


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-- 
_________________________________________________________

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 at engr.wisc.edu

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