[bldg-sim] EnergyPlus - DOE

[Drury.Crawley at EE.DOE.GOV]

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





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Vämshi Goojé


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