Here is a reply from Torsten Welfonder, who is having some email problems...
Michaël Kummert
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Dear Sounghun Yun,
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on 2004-05-24 23:21, Sounghun Yun wrote:
Hi, every trnsys users.
I found some trouble from the result of Comis/Trnsys coupling calculation when there were severe indoor-outdoor temperature differences. That is, when the indoor-outdoor temperature difference changed for a time step (changing about 3 or 5 degree C for 1 hr), the amount of infiltration of building falling down unreasonably. Generally speaking, if there was no wind around a building, the amount of infiltration of a building should have to be the smallest value when the indoor-outdoor temperature differences become zero. And, I confirmed this like result from the calculation of Comis stand-alone (single zonal mode and multi zonal model, too). Indeed, I handled the weather data to be no wind speed and the outdoor temperature should be changed step by step (for eg., 15 degree C for 12 hours and 20 degree C for the next 12 hours, etc. And the indoor temperature is set to 20 degree C) for the purpose of finding some clue. And the unreasonable value was found at the time when the temperature difference changed. I have one more question in here ; why the output data is interpolated even though Type9 was set not to interpolate any input value(I entered "-1" for the setting of interpolation)? The problem was occurred at the time step of interpolation. When I set the simulation time step of control cards to be smaller(for eg. 10 minute), the results showing better than large time step(1hr). Is there any relationship between the time step and Trnsys-Comis coupling?
Any one who has good idea about these problems, teach me please..
Best regards
**************************************************************** below : an example
Tin(C) Tout(C) infiltraion(m3/h) 3:00 20 10 40 4:00 20 10 40 5:00 20 12.5 6 <-- I entered 10 degree C for 5:00 6:00 20 15 30 7:00 20 15 30
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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@xxxxxxxxxxxxx
SEL Web Site: http://sel.me.wisc.edu TRNSYS Web Site: http://sel.me.wisc.edu/trnsys
Attachment:
COMIS_TRNSYS_questions.doc
Description: MS-Word document