[EnergyPlus_Support] Re: zoning problems

["energypluser" <energypluser@xxxxxxxxxxxx>]

Hi Mike

My setpoint schedule for each zone is the same. And I compared the 
heating load and cooling load for a heating month and a cooling 
month. For the heating month, there is no cooling load at all. So I 
am confused about the net load comparasion. The most weird thing is 
that the cooling loads of two cases are similiar, but the heating 
load of 9 zone with no wall is 80% more than that of 3 zone. 
The heating load is the total load of the building.
Can you explain it to me ?
Thank you in advance. 

charlie

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@g...> wrote:
> (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@g...




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