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Re: [EnergyPlus_Support] Re: Problem in Sensible Cooling Rate
On 2 Oct 2006 at 5:19, sdep1017 wrote:
> 1. How can we find out the construction gains then?
It gets messy, because of the way the components interact.
>
> 2. In a simple zone with windows and conditioned by purchased
> heating, is construction loads = heating cooling loads - space
> gains - window loads - infiltration & ventilation loads ?
This is probably the best approach, however, there are time-lag issues for heat
gains vs. loads. For example, the radiant portion of internal loads is
reported as a heat gain at hour 9, but it's impact on the zone cooling load may
be spread over the next several hours. So, this is only an estimate of the
contribution of the building envelope, and it must be done on the order of days
or months rather than hourly.
Mike
>
>
> Thanks,
> yijun
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> <mjwitte@...> wrote:
> >
> > There are report variables for window solar gain, and for
> mechanical
> > ventilation, but there are no direct report variables for heat
> gain from the
> > walls.
> >
> > Mike
> >
> > On 28 Sep 2006 at 15:04, Apple Chan wrote:
> >
> > > Dear Mike
> > >
> > > Thanks very much for your reply. The zone temperatures are
> identical in
> > > the two runs since only the glazing material was changed in each
> run. In
> > > EnergyPlus, could I have an output showing the breakdown of the
> cooling
> > > rate components, e.g. cooling rate due to heat gain from
> concrete wall,
> > > that due to solar through window, that due to ventilation load,
> etc., so
> > > that I can trace the cause of this problem?
> > >
> > > Thank you!
> > >
> > > Apple Chan
> > > 28 Sep. 2006
> > >
> > >
> > > At 03:51 PM 9/27/2006 -0500, you wrote:
> > >
> > > >Report variable "Zone/Sys Sensible Cooling Rate" (and similar
> variables)
> > > >reports the amount of cooling delivered to the zone by the HVAC
> system. I
> > > am
> > > >guessing that the HVAC system is not controlling the zone
> temperature in
> > > >one of
> > > >both of these cases. Is the zone temperature the same in both
> runs?
> > > >
> > > >Mike
> > > >
> > > >On 27 Sep 2006 at 13:32, Apple Chan wrote:
> > > >
> > > > > Dear all
> > > > >
> > > > > I had run EnergyPlus simulation for my simple model of an
> office
> > > building
> > > > > with window to wall ration of 0.5. When the glazing material
> is changed
> > > > > from clear glass to absorptive glass, the window transmitted
> solar (J)
> > > is
> > > > > reduced by about 30% which is very reasonable. However,
> there is almost
> > > no
> > > > > change in the sensible cooling rate. Could anyone please
> give me some
> > > > > advices on this problem?
> > > > >
> > > > > Many thanks!
> > > > >
> > > > > Apple Chan
> > > > > 27 Sep. 2006
> > > > >
> > > > >
> > > > >
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> > > > >
> > > >
> > > >========================================================
> > > >Michael J. Witte, GARD Analytics, Inc.
> > > >EnergyPlus Testing and Support
> > > ><mailto:EnergyPlus-Support%40gard.com>EnergyPlus-Support@...
> > > >
> > > >
> > >
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> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support
> > EnergyPlus-Support@...
> >
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf and press the "search" button.
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