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2021-04-14 17:09:43 -0500 | commented question | High airlfow and fan sizing eQuest, Build 7175 For what it's worth, I just encountered the same issue. This does appear to be a sizing bug in eQUEST with DOE2.3. In th |
2021-04-14 17:08:42 -0500 | commented question | High airlfow and fan sizing eQuest, Build 7175 For what it's worth, I just encountered the same issue. This does appear to be a sizing bug in eQUEST with DOE2.3. |
2020-10-23 14:04:11 -0500 | answered a question | Importing WINDOW 7.5 Data to eQuest 7175 Looks like there's a difference in the glass layers in the Windows screenshot and in the text data file. In the screensh |
2019-12-18 10:29:12 -0500 | commented question | OpenStudio 2.9.1 crash on startup Thanks for the quick response. I was opening the app directly. I don't see a BCL directory. In my users directory, there |
2019-12-18 10:11:29 -0500 | received badge | ● Organizer (source) |
2019-12-18 09:51:00 -0500 | asked a question | OpenStudio 2.9.1 crash on startup OpenStudio 2.9.1 crash on startup Just installed OpenStudio v2.9.1 on a new Dell laptop computer, and it crashes on star |
2018-10-15 17:53:22 -0500 | answered a question | How to model constant air volume system using eQUEST? You can change the system input for "Cool Control" to have the supply air temperature vary. You probably want to choose |
2018-09-20 18:25:25 -0500 | asked a question | Single-zone VAV heat pump in OpenStudio Single-zone VAV heat pump in OpenStudio I see a few options in EnergyPlus to model a single-zone heat pump with variable |
2018-09-18 13:39:47 -0500 | edited answer | EIRfPLR vs EIRfPLR&dT Hi, Anna. The Chiller:Electric:EIR model in EnergyPlus is the same as the DOE2.1 model, which is also available in eQUE |
2018-09-18 13:33:51 -0500 | answered a question | EIRfPLR vs EIRfPLR&dT Hi, Anna. The Chiller:Electric:EIR model in EnergyPlus is the same as the DOE2.1 model, which is also available in eQUE |
2018-03-21 07:49:56 -0500 | received badge | ● Necromancer (source) |
2016-06-04 16:22:19 -0500 | commented question | Do energy codes permit mechanical cooling for exterior spaces? As a historical note, in the early 1990's I was involved in developing an energy code for Hawaii that explicitly limited cooling of unenclosed spaces. At first it was to be disallowed, but push back from the hospitality industry lead to a compromise by setting a limit of 20 Btu/hr-sf of cooling capacity for such spaces. Pretty crazy... |
2016-03-28 14:49:42 -0500 | commented answer | How is simple ventilation controlled when using ideal loads in OpenStudio? After a bit of poking around, looks to me like there is no outdoor air ventilation being included when ideal loads is selected in OpenStudio. Looks like there is no point in OpenStudio's writing a ZoneVentilation:DesignFlowRate object because the ideal loads system won't use it. As I understand it, there must be an entry in the ideal loads system for DesignSpecificationOutdoorAir Object Name. Seems like Openstudio should put in that entry for zones with ideal loads systems. -Erik |
2016-03-12 17:07:54 -0500 | commented answer | How do I enter in design specification outdoor air in OpenStudio? I agree that this is confusing. Kind of an orphan in the OpenStudio interface. Seems like Design Specification Outdoor Air could be added to the "Loads" section along with People Definition, Lights Definition, etc. That would allow one to copy, add, edit outdoor air specifications in order to then select them in the Space Type section. Seems like the same issue applies to the Space Infiltration Flow Rates (SpaceInfiltration:DesignFlowRate) objects and the Space Infiltration Effective Leakage Areas objects. And these are now in the Space Types section rather than Facilities. |
2016-03-09 08:30:20 -0500 | received badge | ● Scholar (source) |
2016-03-08 19:28:56 -0500 | commented answer | Where are OpenStudio fan schedules? Thanks, Lyle. Yes, I understand all this. I was making the point that the OpenStudio default templates do not include fan operation schedules besides "Always On" or always zero (i.e. cycling). Normal commercial operation is for the system to turn on in the morning and off in the evening. Seems to me there should be some default schedules representing this common mode of operation. As it is, it appears that the user must create their own schedules to do this. -Erik |
2016-03-08 18:10:11 -0500 | commented answer | Where are OpenStudio fan schedules? Thanks, Taylor. I know how to create schedules. I'm just thinking that lots of people could be running models with 24/7 fan operation and not realize that they are doing so. -Erik |
2016-03-08 18:08:17 -0500 | commented question | Where are OpenStudio fan schedules? Thanks for the response. No, I don't think OpenStudio should infer the fan schedules. I think the templates should include fan schedules that include the same on/off times as the thermostat schedules. The templates already include thermostat schedules; seems like they should also include corresponding fan operation schedules. |
2016-03-08 16:53:43 -0500 | received badge | ● Student (source) |
2016-03-08 16:06:14 -0500 | asked a question | Where are OpenStudio fan schedules? I know that I can create my own fan operation schedule, but I'm puzzled that they are not included in the default OpenStudio templates. I'm hoping someone can point out that I'm missing something. My issue is that my only default options are cycling fans or 24/7 fans. I created a simple model using the OpenStudio plugin in Sketchup and selected the 90.1-2010 template. In OpenStudio I assigned a PTAC system as zone equipment. The only options I have for "Supply Air Fan Operating Mode Schedule Name" are "Always On Discrete" or "Cycling PTAC Fan Mode Always Zero". Therefore, with these choices the fan either cycle's on/off or runs 24/7. There is not a schedule that matches the thermostat setpoint schedule. In other words, my default office thermostat schedules assume 6am to 10pm operation. But the fans run all the time. Appears that I need to create a custom schedule so that fan operation matches thermostat operation. Seems like many users would not notice this, and the result is their models would overpredict fan energy due to 24/7 operation. Is there a reason that the templates due not include fan schedules? What am I missing? -Erik Kolderup |
2015-11-26 08:40:34 -0500 | received badge | ● Nice Answer (source) |
2015-03-06 12:30:53 -0500 | answered a question | Convert SEER to EER for eQUEST Just noticed a 2013 paper from Texas A&M, METHODOLOGY FOR CALCULATING COOLING AND HEATING ENERGY-INPUT-RATIO (EIR) FROM THE RATED SEASONAL PERFORMANCE EFFICIENCY (SEER OR HSPF). That paper presents correlations to give you COP as a function of SEER. They report this correlation works better than earlier methods from FSEC and ASHRAE RP-1197. Find it here: http://repository.tamu.edu/handle/196... The paper is marked DRAFT. Perhaps one of the authors can report on status. -Erik |
2014-09-19 20:08:23 -0500 | answered a question | What features of eQUEST make it appealing to energy modelers? DOE2 runs fast. Therefore, I can quickly explore the impact of changes to my model and perform some old-fashioned human-driven optimization. And the ability to make quick incremental changes and check the results also helps me to avoid errors and produce better quality models. I find that when I use slower simulation tools that I have to work differently and I'm more reluctant to test things. It requires more planning ahead, running batches, etc. That's not necessarily a bad thing. It's just different and tests my patience! |
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2014-09-12 14:45:51 -0500 | answered a question | What sources are there for plug/equipment load assumptions for different space types? Check out Appendix 2 of the COMNET Modeling Guidelines and Procedures. It's an Excel spreadsheet with a list of plug loads and other internal load assumptions for a range of building types. Like with any resource, use judgment regarding whether the numbers make sense for your case. But it's a good place to start. And COMNET Appendix C includes a corresponding set of schedules. See http://www.comnet.org/mgp/content/app.... I find chapter 18 of the ASHRAE Fundamentals to have some useful tables, especially for offices. ASHRAE's Advanced Energy Design Guides are a good source of load assumptions for several building types, and they include both standard efficiency and high efficiency values in some cases. If you're interested in internal load schedules, then check out ASHRAE research project 1093-RP. It provides hourly profiles for several building types based on some measured values. Many "default" schedules do not include realistic nighttime plug load values. |
2014-09-12 14:36:53 -0500 | received badge | ● Supporter (source) |