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

[RobertWichert]

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, "??" <foolishstar at 163.com 
> <mailto: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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