Re: [EnergyPlus_Support] zoning problems

["Michael J. Witte" <mjwitte@xxxxxxxx>]

(Responding to this post rather than yesterday's posts.)  

There are many reasons this could happen - differences in radiant exchange, 
differences in thermal mass effects, differences in distribution of solar 
gains, excess heat from the interior zone heating the perimeter zones.  
Remember, if the simulation model describes no surfaces or mixing between the 
interior and perimeter zones (in the 9-zone case) then there is no heat 
transfer between them.  In the 3-zone case, there is convective and radiative 
exchange between the perimeter walls and the interior surfaces and internal 
loads.  A more valid comparison is the "net load" of the two cases over an 
entire day or year (assuming the spaces are heated and cooled to the same 
temperature at all times), where "net load" = Heating load minus Cooling Load.  
This should account for offsetting loads in the interior and perimeter spaces.

Mike


On 9 Aug 2005, at 14:30, energypluser wrote:

> I have divided my building into 9 zones without using interior walls
> as you sugguested. For the real building, there are only 3 zones.The
> following figure shows the plan view of the floor.The center zone is
> uncontrolled.The north and south zone are served by purchased air.
> -------------------
> |                 |
> |                 |
> |                 |
> |-----------------|
> |                 |
> |-----------------|
> |                 |
> |                 |
> |                 |               
> -------------------
> For the specificaiton of perimeter zone and interior zone, the
> following picture shows the zoning.
> 
> -------------------
> |    perimeter    |
> |-----------------|
> | |   interior  | |
> | |             | |
> |-----------------|
> | |
> |-----------------|
> | |             | |
> | |  interior   | |
> |-----------------|
> |    perimeter    |
> -------------------
> 
> The perimeter and interior zone have the same schedule and same
> internal gains. Since there are no wall among these zones. I suppose
> that the load results should be close for the two situations. But
> the heating load of the second case is larger than that of the first
> case. The max differenc is up to 120%.
> Could you please tell me the reason for the difference?
> Thank you in advance
> 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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