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Re: [EnergyPlus_Support] Re: zoning problems
It is difficult to guess why this is happening without seeing the input files.
Please upload both files to the yahoo files area or send zipped to energyplus-
support@xxxxxxxx
Mike
On 11 Aug 2005, at 4:34, energypluser wrote:
> 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...
>
>
>
>
>
> 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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