[Bldg-sim] LS-D vs SS-D vs SV-A reports in equest

[Brian Fountain]

SS-D shows you the peak and annual heating and cooling loads including ventilation when the simulation is run on the annual weather.  It comes from the SYSTEMS + PLANT run.  (SS = system summary)

SV-A will show you the heating and cooling capacities of your systems – if you autosized your systems then this is where you will see the result of the autosizing. (SV = system verification)

LS-D is LOADS only – before the SYSTEM run so no ventilation and no reheat.  It essentially shows you envelope and infiltration loads shown by component in LS-C and LS-F.  As Jeff noted – the LOADs part of the run is done at the constant temperature and thermostat schedules are applied during the SYSTEMS run. (LS = loads summary & LV = loads verification)


From: Bldg-sim <bldg-sim-bounces at lists.onebuilding.org> On Behalf Of Haberl, Jeff via Bldg-sim
Sent: Tuesday, May 16, 2023 1:00 PM
To: bldg-sim at lists.onebuilding.org; Hamza Sohail <hamzasohail054 at gmail.com>; John Aulbach <jra_sac at yahoo.com>
Subject: Re: [Bldg-sim] LS-D vs SS-D vs SV-A reports in equest
________________________________
Hello Hamza:

John's right, check the DOE-2 Reference Manuals, Part 2, which has a complete explanation between LS-D, SS-D and SV-A...as there's a big difference in the values being reported (LA-7890-M, LBL-8706 Rev.1). There is also useful information in the DOE-2 Basics manual.

In general, anything to do with LOADS is the simulation run at a constant indoor temperature, as well as other oddities that DOE-2 had in LOADS. So, SS-D would be coming from SYSTEMS, where the actual space temperature was determined by weighting factors, and the load change accordingly. This would include thermostat setbacks, etc.

The SV-A report is not really a simulation result, but rather a verification of what you put into the simulation since much of what's in a DOE-2 input file is "hidden" in the defaults, only to be seen in the LV, SV, PV outputs.

To complicate things, EQUEST has slightly different outputs than does DOE2.1e, but follows it pretty closely.

Hope this helps. If you can't get your hands on the manuals let me know. I should be able to put a copy on the TAMU google drive for you.

Jeff


Jeff S. Haberl, Ph.D., P.E.inactive, FASHRAE,FIBPSA               We are like fluttering leaves on the branches of trees

Department of Architecture                                                       in the forests of the landscape that surrounds us.

Texas A&M University                                                                  If we could, for just a moment, flutter together,

College Station, TX 77845-3581                                                 We could lift the earth up to be a better place.  JSH 2022

Office: 979-845-6507, Lab: 979-845-6065

Fax 979-862-2457

jhaberl at tamu.edu,www.esl.tamu.edu<mailto:jhaberl at tamu.edu,www.esl.tamu.edu>

________________________________
From: Bldg-sim <bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>> on behalf of John Aulbach via Bldg-sim <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>>
Sent: Tuesday, May 16, 2023 11:33 AM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org> <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>>; Hamza Sohail <hamzasohail054 at gmail.com<mailto:hamzasohail054 at gmail.com>>
Subject: Re: [Bldg-sim] LS-D vs SS-D vs SV-A reports in equest

Try checking in Volume 4 Libraries and Reports of the online DOE-2 help menu within the program. It would be the absolute best source. John R Aulbach, PE On Tuesday, May 16, 2023 at 09: 26: 34 AM PDT, Hamza Sohail via Bldg-sim <bldg-sim@ lists. onebuilding. org>
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Try checking in Volume 4 Libraries and Reports of the online DOE-2 help menu within the program. It would be the absolute best source.

John R Aulbach, PE

On Tuesday, May 16, 2023 at 09:26:34 AM PDT, Hamza Sohail via Bldg-sim <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>> wrote:


hi, can some one explain me difference between LS-D(building monthly load summary) and SS-D(building hvac load summary and SV-A(system design parameters) reports in eQuest as i am confused because in each report it shows different "Maximum Cooling Load kBTU/hr" value.
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