[bldg-sim] EnergyPlus - DOE

Vämshi Goojé vamshi.gooje at gmail.com
Thu Jan 19 06:30:56 PST 2006


Mahabir,
The extended run time in EPlus could be due to transient analysis vs. steady
state in doe 2.
Vamshi

On 1/18/06, Mahabir Bhandari <bhandari at fenestration.com> wrote:
>
>  Brian,
>
>
>
> I think one additional difference from uses' point of view, which is not
> reported in this report, is simulation run time. It seems EnergyPlus takes
> 5-10 times longer to complete a whole year simulations than DOE2. I was
> running a simple 5 story building with VAV system and it took me more than
> 40 minutes for annual hourly simulations (1 hr time step) in EnergyPlus
> while eQuest could run the same building in less than 5 minutes. I am
> interested in hearing from others on the run time issue.
>
>
>
> Mahabir Bhandari
>
>
>
>
>  ------------------------------
>
> *From:* Brian Fountain [mailto:bfountain at greensim.com]
> *Sent:* Wednesday, January 18, 2006 12:12 PM
> *To:* bldg-sim at gard.com
> *Subject:* [bldg-sim] EnergyPlus - DOE
>
>
>
> That is a big question.
>
>
>
> For a comparison of current energy simulation software, you could look at
> Dru Crawley's paper comparing 20 tools:
>
>
> http://www.energytoolsdirectory.gov/pdfs/contrasting_the_capabilities_of_building_energy_performance_simulation_programs_v1.0.pdf
>
>
>
> Main differences between DOE and EnergyPlus:
>
> 1)      DOE calculates the space loads for each hour then calculates the
> system and plant response for each hour.  EnergyPlus simultaneously solves
> the loads the system/plant response for each timestep.
>
> 2)      DOE has a fixed 1 hour timestep, EnergyPlus has a variable
> timestep (down to 1 minute?).
>
> 3)      There are also key issues with the weighting factor assumptions,
> the wall convective coefficients.
>
>
>
> I haven't used EnergyPlus much yet.  What did I miss guys?
>
>
>
> Brian Fountain
>
>
>
> -----Original Message-----
> *From:* bldg-sim at gard.com [mailto:bldg-sim at gard.com] *On Behalf Of *Renato
> Sousa
> *Sent:* January 18, 2006 10:56 AM
> *To:* bldg-sim at gard.com
> *Subject:* [bldg-sim] EnergyPlus - DOE
>
>
>
> Hello everybody.
>
>
>
> I would like to know if anybody has experience on using both EnergyPlus
> and DOE.
>
> Currently I'm using an interface for EnergyPlus. From the software
> description I couldn't find out the main differences between EnergyPlus and
> DOE. Does anyone know the main differences or where can I find them?
>
>
>
> From the description it is said that EnergyPlus was based on DOE and BLAST
> so I suppose EnergyPlus has some extra features but I'm not sure if that is
> right.
>
>
>
> Best regards,
>
> *Renato Sousa*
>
> *Tel: +351 919 316 221 | E-mail: **renato.sousa at fluidinova.pt*
>
> * *
>
> *___________________________________________________*
>
> *FluidInova, Engenharia de Fluidos, SA*
>
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>
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>
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>
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>
>
>
>
>
>
>
>
>
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--
Vämshi Goojé
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