[EnergyPlus_Support] Re: Zone Temperature Peaks too Early

["jeffreylauck" <JeffLauck@xxxxxxxxx>]

Jeremiah,

Thanks for the information.  I'll explore some of these options.

Regards,

Jeff

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jeremiah Crossett <jcrossett@...> wrote:
>
> There are several convection coefficient options as well as the potential
> for user generated coefficients that allow for curve objects that you might
> explore as well.  I find that the French thermal regulation of steady state
> 7.7 W/m2.k works well most of the time, and that
> FisherPedersenCeilingDiffuserWalls
> and FisherPedersenCeilingDiffuserCeiling are the most interesting. You can
> also set a schedule to modify the user value, then use EMS to change the
> schedule based on the temperature of your wall or some other variable.
> 
> Surface Type AllInteriorWalls
> Convection Coefficient 1 Location Inside
> Convection Coefficient 1 Type Value
> Convection Coefficient 1 7.7
> Convection Coefficient 1 Schedule Name
> Convection Coefficient 1 User Curve Name
> Convection Coefficient 2 Location Inside
> Convection Coefficient 2 Type
> Convection Coefficient 2
> Convection Coefficient 2 Schedule Name
> Convection Coefficient 2 User Curve Name
> 
> Surface Type AllInteriorWalls
> Convection Coefficient 1 Location Inside
> Convection Coefficient 1 Type FisherPedersenCeilingDiffuserWalls
> Convection Coefficient 1
> Convection Coefficient 1 Schedule Name
> Convection Coefficient 1 User Curve Name
> Convection Coefficient 2 Location Inside
> Convection Coefficient 2 Type
> Convection Coefficient 2
> Convection Coefficient 2 Schedule Name
> Convection Coefficient 2 User Curve Name
> 
> 
> *
> *
> *
> *
> *Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions*
> *
> 120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
> www.phasechange.com
> *
> 
> *
> *
> *
> *
> 
> 
> 
> On Tue, May 7, 2013 at 3:02 PM, jeffreylauck <JeffLauck@...> wrote:
> 
> > **
> >
> >
> > Jean,
> >
> > Thanks for your response. I suppose it's possible that internal surfaces
> > are slowing convection heat transfer in the actual house, but there's not a
> > lot of furniture in the space. A small couch, a chair, and a table are
> > about it.
> >
> > The only way I can think of to test this theory is to increase the
> > roughness of the internal surfaces in the zone. Do you have any other
> > suggestions?
> >
> > Thanks,
> >
> > Jeff
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@>
> > wrote:
> > >
> > > Could it be that the actual convection from surfaces is different or
> > more or less than those modelled thereby transfering heat from surfaces to
> > air faster or slower. Are there more internal surfaces like furniture which
> > could contribute the these effects?
> > >
> > > Jean
> > >
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "jeffreylauck" <JeffLauck@>
> > wrote:
> > > >
> > > > Hello All,
> > > >
> > > > First off, thanks for a great community. I've learned a lot from
> > searching through the message archives over the past few months.
> > > >
> > > > I have a model of a Passive House that I am trying to validate using
> > measured data from the actual house. I've created an hourly schedule file
> > for the lights, electric equipment, window usage, blind usage, and hot
> > water consumption based on sub-hourly data collected at the site. I'm using
> > a custom weather file from the roof-top weather station that monitors dry
> > bulb temp, relative humidity, wind speed and direction, and global
> > horizontal solar radiation. The diffuse radiation component was estimated
> > using the Erbs model prior to importing the data into the weather utility.
> > Currently I'm only looking at the summer of 2012.
> > > >
> > > > The problem I'm having is that the peak temperatures in the model
> > occur 2-4 hours before the measured data (2-3 hours in July and September,
> > 3-4 hours in August). Here's what I've determined so far:
> > > >
> > > > 1. It's not due to a time shift in the data. I've verified that all
> > data is GMT-8 and that no Daylight Savings flags are included in the IDF.
> > > > 2. It's not due to a lack of thermal mass. I added a bunch of internal
> > mass as a test and the peaks were reduced but occurred at the same time as
> > previous models. Also, I'm using CondFD with 9 nodes and a 1-minute
> > timestep.
> > > > 3. I don't think it's due to my custom weather file, as I get a
> > similar results using TMY data.
> > > >
> > > > Does anyone have any suggestions on where to look next? Any ideas
> > would be greatly appreciated.
> > > >
> > > > Thanks,
> > > >
> > > > Jeff
> > > >
> > >
> >
> >  
> >
>




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