[Bldg-sim] why the autosized design air flow rate differ so much in different floor?

[韩星]

I think I have known one of the reasons( if more than one).
I set a self-defined wall in the Wizard data edit mode, using the R value definition. However, the R value automatically became U value under Detailed data edit mode. So the roof heat conduction is very large. Besides, I set a ceiling in the second floor which exhaust the hot air out, so the roof conduction load in the second floor is zero. These settings caused the first floor load much larger than the second floor.




At 2012-02-27 01:32:12,RobertWichert <robert at wichert.org> wrote:
Five to ten times?  Check your occupancy carefully.  It sounds like outside air to me.  You either have no occupants on the second floor or ten times the occupants on the first floor.



Robert Wichert P.Eng. LEED AP
+1 916 966 9060
FAX +1 916 966 9068







===============================================


On 2/26/2012 4:42 AM, James Hansen wrote:
It's almost surely your first floor slab.  The default configuration and U-value for these constructions are usually very poor.

-James

On Feb 26, 2012, at 7:31 AM, "韩星" <foolishstar at 163.com> wrote:


Hi, every body,


I now have a difficult problem. I found that the autosized design air flow in the first floor is much larger than the second floor, about 5-10 times of the second floor. I cannot figure out the reason, because the indoor lighting, equipment power and the occupant density are all the same for the two floors.
In my opinion, the second floor should have a higher air-conditioning load than the first floor because it is the building's top floor. But the result is just the opposite.
I really want to know the reason and how I should deal with it.
Thanks
Xing



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