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

[RobertWichert]

Thanks Jeff!

Can you provide a link to your paper, or a site that sells it if it is 
for sale?  Please?

Also, look here for some interesting thoughts on comparing software.  
This has been mentioned before on this list:
http://apps1.eere.energy.gov/buildings/tools_directory/software.cfm/ID=85/pagename=alpha_list


Robert Wichert P.Eng. LEED AP BD&C
+1 916 966 9060
FAX +1 916 966 9068







===============================================

On 5/2/2014 11:37 AM, Jeff Haberl wrote:
>
> 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
>
> 8=!  8=) :=)  8=)  ;=)  8=)  8=(  8=)  8=()  8=)  8=|  8=)  :=') 8=) 8=?
> Jeff S. Haberl, 
> Ph.D.,P.E.inactive,FASHRAE,FIBPSA,......jhaberl at tamu.edu 
> <mailto:........jhaberl at tamu.edu>
> Professor........................................................................Office 
> Ph: 979-845-6507
> Department of 
> Architecture............................................Lab 
> Ph:979-845-6065
> Energy Systems 
> Laboratory...........................................FAX: 979-862-2457
> Texas A&M 
> University...................................................77843-3581
> College Station, Texas, USA, 
> 77843..............................URL:www.esl.tamu.edu
> 8=/  8=)  :=)  8=)  ;=)  8=)  8=()  8=)  :=)  8=)  8=! 8=)  8=? 8=) 8=0
> ------------------------------------------------------------------------
> *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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