[Equest-users] Significan​tly Higher Heating and Cooling Energy Consumptio​n in EnergyPlus When Compared to eQUEST

[Jeff Haberl]

Hello Simge:,



Unfortunately, I don't think you'll ever get EP+ and eQUEST to agree without significant effort. At best, you can get specific aspects of the program to agree, but the overall results can be very different unless you do extrodinary things to the input files.



As part of RP1468  we developed a comparison simulation of the SAMP1E.INP file RUN3A from DOE-2.1e against eQUEST and EP+, which we could not get to agree very well. In fact, we could not even get eQUEST and DOE-2.1e to agree. The results can be found in the final report for 1468.



In addition we developed a comparison tool the "RASR" that automatically chooses the correct variables to compare, which was a major problem with the comparisons...what to compare against what...not even clear between DOE-2.1e and DOE-2.2.



Finally, the defaults all need to be "revealed" as well, since this can be one other areas where you think you're simulating the same thing...but don't know it because the defaults are set to X,Y,Z and you don't see it unless you have the program print all the defaults. In addition, you'll need to "reset" all the performance curves in one of the other programs to match.



In the long run, it may be easier to solve clmate change than it may be to get the different simulations engines to agree.



Jeff


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Jeff S. Haberl, Ph.D.,P.E.inactive,FASHRAE,FIBPSA,......jhaberl at tamu.edu<mailto:........jhaberl at tamu.edu>
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________________________________
From: equest-users-bounces at lists.onebuilding.org [equest-users-bounces at lists.onebuilding.org] on behalf of Simge Andolsun [simgeandolsun at gmail.com]
Sent: Thursday, May 01, 2014 3:35 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Significan​tly Higher Heating and Cooling Energy Consumptio​n in EnergyPlus When Compared to eQUEST

Dear eQUEST users (Particularly Dear Joe Huang),

Please find the attached eQUEST and EnergyPlus files. They represent identical cases for comparison of the two programs. The runs are conducted for Los Angeles. The heating and cooling consumption of EnergyPlus file are, however, unreasonably higher than that of EQUEST. It is particularly strange that heating occurs in early morning time during the summer in EnergyPlus whereas no heating occurs in eQUEST during these hours.

We need our results not to deviate extremely from eQUEST when we start using EnergyPlus. That is why, I am conducting this comparative analyses for cases representing identical conditions. I would appreciate it very much if you could examine these files and let me know whether there is anything I can do to make the results of these cases in the two programs as close as possible to each other.

Dear Joe Huang,

Please see the attached charts that show the hourly variation of temperatures in the system nodes and hourly energy consumption. There is definitely something weird going on in the early morning hours when the system just starts working. I have read your paper in the link below. Below is a section from your paper that I have paid particular attention to. Might I be having a similar issue in my case?
http://gundog.lbl.gov/dirpubs/SB06/huang.pdf.

"Heating to the cooling setpoint. Temperature plots revealed that at times during the shoulder seasons, EnergyPlus had difficulty in picking between the heating or cooling season control logic. This resulted in the supply air being heated to the cooling, rather than the heating, setpoint during the morning hours. This problem was corrected by improving the setpoint manager in EnergyPlus."

Looking forward to hearing from you,

Best Regards,
Simge Andolsun, PhD.
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