[bldg-sim] EnergyPlus - DOE
Drury.Crawley at EE.DOE.GOV
Drury.Crawley at EE.DOE.GOV
Thu Jan 19 08:19:11 PST 2006
Standard 140 and other validation results,
comparing EnergyPlus to other programs
is on the EnergyPlus web site:
http://www.eere.energy.gov/buildings/energyplus/testing.html
"Liu, Xiaobing"
<xiaobing.liu at oksta To: bldg-sim at gard.com
te.edu> cc: bhandari at fenestration.com
Sent by: Subject: [bldg-sim] EnergyPlus - DOE
bldg-sim at gard.com
01/19/2006 10:22 AM
Please respond to
xiaobing.liu
Is there any comparison between e+ and DOE 2 with regard to the accuracy of
the predicted loads and energy consumption? I'm curious about the benefits
(in terms of accuracy) obtained from simultaneously solving the building
loads and HVAC systems.
Xiaobing
From: bldg-sim at gard.com on behalf of Vämshi Goojé
Sent: Thu 1/19/2006 8:30 AM
To: bldg-sim at gard.com
Cc: bhandari at fenestration.com
Subject: [bldg-sim] EnergyPlus - DOE
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
TECMAIA - Parque de Ci�ncia e Tecnologia da Maia
Rua Eng� Frederico Ulrich, n� 2650 | 4470-605 Moreira da Maia |
Portugal
Tel: +351 229 408 265 | Fax: +351 229 408 266
E-mail: geral at fluidinova.pt | Web: www.fluidinova.pt/
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Vämshi Goojé
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