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Re: [EnergyPlus_Support] Coldrooms
Hello Richard,
Thanks for the help, that was very usefull.
Best regards,
Ricardo Miranda
2007/11/26, Richard Raustad <RRaustad@xxxxxxxxxxxx>:
>
> A window air conditioner or packaged terminal air conditioner (PTAC)
> would also work for 1) if it's a single zone. And these models do not
> require a heater and are easier to implement. A packaged terminal heat
> pump (PTHP) could also be used in a single zone, but this model requires
> a heater.
>
> Richard Raustad wrote:
> >
> > 1-If central cooling is typically used for these rooms, use a furnace or
> > unitary system. You would most likely schedule the heating coil off. Be
> > careful to avoid frost build up on the coil (check the supply air
> > temperature). These models were intended to simulate air conditioners
> > for "occupied" zones and have not been tested at low temperatures. You
> > can probably simulate conditions down to about 15C but I'm not sure of
> > the lower limits.
> >
> > 2-The refrigerated case model is based on an empirical model by Howell.
> > This model varies case performance based on room relative humidity or
> > dew point. Interactions of the case with the zone is modeled through
> > case credits. This model is probably not the best choice for simulating
> > a cold room. And this refrigerated case would have to be connected to a
> > refrigeration compressor rack, which is typically not used for walk-in
> > coolers or "cold" rooms found in a super market. The model intent is to
> > simulate various display cases in a super market, other uses would be
> > crude approximations. The refrigerated case model could only be used to
> > "approximate" energy use for isolated and well-insulated walk-in type
> > coolers or freezers. The height input in the refrigerated case object is
> > only for anti-sweat heater calculations (heat balance method). Case
> > performance is based on lineal footage to simulate various case lengths.
> > See the Engineering documentation for equations used and references to
> > papers describing the model.
> >
> > 3-DB should answer this question.
> >
> > The super market (SuperMarket*.idf) example files distributed with
> > Energy+ may also be useful. There is an example of a walk-in freezer,
> > but is only intended to be an example and shows how flexible the
> > refrigerated case model inputs were designed. You must carefully use
> > manufacturers data to get close to the actual energy use for this type
> > of equipment.
> >
> > Ricardo Miranda wrote:
> > >
> > > Hello,
> > >
> > > I´m simulating a supermarket that have some coldrooms. This
> > coldrooms are
> > > supplied by a central cooling and has a different height ( shorter)
> > of the
> > > rest of the building. I have some questions:
> > >
> > > 1- what type of system should we use to refrigerate such rooms?
> > > 2-Can the coldrooms be modeled as a refrigereted case, and if so, how
> > > can we
> > > account for it´s height, since energy plus only account for the linear
> > > lenght and doesn´t have the height option?
> > > 3-If it cannot be modeled as a refrigereted case, using the
> > interface tool
> > > Design builder, how can we model these rooms with a different height
> > > of the
> > > rest of the building?
> > >
> > > Regards,
> > > Ricardo Miranda
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> >
> > --
> > Richard A. Raustad
> > Senior Research Engineer
> > Florida Solar Energy Center
> > University of Central Florida
> > 1679 Clearlake Road
> > Cocoa, FL 32922-5703
> > Phone: (321) 638-1454
> > Fax: (321) 638-1439 or 1010
> > Visit our web site at: http://www.fsec.ucf.edu <http://www.fsec.ucf.edu>
>
> >
> > UCF - From Promise to Prominence: Celebrating 40 Years
> >
> >
>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
>
>
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