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2022-11-06 11:11:24 -0500 | answered a question | How to model System 8 ASHRAE 90.1 - 2016 baseline There are many potential causes for this, so it's impossible to guess just from your post, but you may find this post he |
2022-10-30 09:35:12 -0500 | answered a question | 2018 SketchUp OS plugin not loading I believe you need Sketchup 2017, at least that is what we use for our OS v2.9 projects. Email me and I can send you th |
2022-10-21 08:59:15 -0500 | commented question | Older measures no longer working in OS It is likely due to the newer version of EnergyPlus in newer versions of OS. Since you asked for resources for troublesh |
2022-10-13 00:51:44 -0500 | commented question | EnergyPlus Terminated with a Fatal Error What does your eplusout.err file say? |
2022-01-23 09:56:45 -0500 | answered a question | high electricity use for chiller Yes the part load curve is likely the culprit. To get that more accurate to your selected chiller, there are some handy |
2018-12-10 16:32:01 -0500 | commented question | Energy consumption does not change with different wall construction Also, the walls in the model you posted have a U-value of about 0.007 (in IP units), or R-142. Not sure if that was int |
2018-12-10 16:26:17 -0500 | commented question | Energy consumption does not change with different wall construction Well at least it is changing now, so you know it's working. Whether the model is right or not is a complicated question |
2018-12-10 13:58:34 -0500 | commented question | Energy consumption does not change with different wall construction I took a look and the spaces 101 and 1 may be interfering with your other spaces as they are overlapping the other space |
2018-12-10 13:58:13 -0500 | commented question | Energy consumption does not change with different wall construction I took a look and the spaces 101 and 1 may be interfering with your other spaces as they are overlapping. I suggest del |
2018-12-10 13:28:41 -0500 | commented question | Energy consumption does not change with different wall construction I don't have the software to open a .rar file on this machine, but yes that is a problem. This is an old tutorial but I |
2018-12-10 12:39:53 -0500 | commented question | Energy consumption does not change with different wall construction I don't have the software to open a .rar file on this machine, but yes that is a problem. Every space needs exactly one |
2018-12-10 09:28:27 -0500 | answered a question | Measure for Adding Daylighting Controls Yes -- Check the BCL under Lighting Controls. https://bcl.nrel.gov/node/37859 |
2018-12-10 09:19:27 -0500 | commented question | Energy consumption does not change with different wall construction It's possible that either constructions are not assigned correctly, or HVAC is not set up correctly so that it is not be |
2018-08-16 08:39:02 -0500 | commented question | Something wrong with my HVAC --> Unreasonable heating consumption results First thing is that you have a Water Heater object on your heating Hot Water loop, which is why all of your District Hea |
2018-08-15 12:48:24 -0500 | commented question | District heat for floors and water heating in OpenStudio (HVAC Tab) Not enough info here to diagnose what is going on with HVAC, but clearly something is not right. Now that you have it r |
2018-08-15 12:20:06 -0500 | commented question | Inconsistent results with heating consumption (high values during the summer ???) I am going to bet that since your DHW is also on district heating, that this is 99% DHW usage. This is somewhat reflect |
2018-08-15 12:01:45 -0500 | commented question | District heat for floors and water heating in OpenStudio (HVAC Tab) Water Heater, not boiler. Not the same thing. |
2018-08-15 11:07:37 -0500 | commented question | District heat for floors and water heating in OpenStudio (HVAC Tab) Be sure that your radiant construction is built of appropriate materials (I use insulation, concrete, and a floor coveri |
2018-08-15 09:15:37 -0500 | commented question | District heat for floors and water heating in OpenStudio (HVAC Tab) Also, for your district DHW system: Rather than using a district heating object, I prefer to use a regular Water Heater |
2018-08-15 09:09:30 -0500 | commented question | District heat for floors and water heating in OpenStudio (HVAC Tab) Are you trying to model radiant FLOORS or radiant BASEBOARDS? Those are two different things. Radiant FLOORS will requ |
2018-04-18 09:13:57 -0500 | commented answer | PAT run failing with zero errors or warnings Glad it was an easy fix! On my machine the long-filename culprits that push me above the character limit are usually th |
2018-04-16 10:13:51 -0500 | commented question | PAT run failing with zero errors or warnings Are you running on a windows-based machine? If so, it may be that the file names of your measure files end up too long. |
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2018-04-16 10:13:21 -0500 | commented answer | PAT run failing with zero errors or warnings Duly noted and agree. I will move to a comment instead (sorry I'm not very well versed in posting protocol here) |
2018-04-16 09:46:14 -0500 | answered a question | PAT run failing with zero errors or warnings Are you running on a windows-based machine? If so, it may be that the file names of your measure files end up too long. |
2016-09-13 00:32:05 -0500 | answered a question | Lighting energy consumption of 15th floor is higher than 14th floor. The mid floors make sense; less ground reflectance going up. It's consistently your top floor that is the anomaly. In that case, you may have some different construction materials happening that are changing how much daylight is bounced around the room. Since the top level is the driving factor, check to see if you have a different internal reflectance going on with the underside of your roof surface as compared to an internal ceiling surface. I had something similar happen once when modeling radiant surfaces vs non-radiant surfaces. It took me HOURS to figure out what was going on, but the floor construction was the culprit. |
2016-09-13 00:17:31 -0500 | answered a question | 90.1-20XX ECB - Exterior Lighting What an interesting question! Short answer -- it doesn't really matter what we think, it only matters what your code reviewers think, and how they interpret it. I think it is probably more correct to model it identically in the baseline and proposed (because of the "include all loads" language), but my local jurisdiction seems to prefer it broken out with baseline vs proposed since that is what they are used to under IECC Total Building Performance Method (where it is explicitly included and traded). They want to see that the design of the exterior lighting is in compliance. Since compliance is the name of the game, I always show a baseline and proposed load generated using 9.4. I haven't had a project that is close enough to the edge that a bit of exterior lighting tradeoff makes a difference, and code officials are happy. |
2016-07-15 23:00:39 -0500 | answered a question | Thermostat won't set on OpenStudio 10.11 win64 My understanding is that it was a change in policy. You can find this setting in the OS interface, Zone tab, where you can apply heating and cooling thermostat schedules to each zone. So, think in terms of heating/cooling schedules rather than single thermostats. With this new methodology, each zone now has its own individual thermostat, so that you can apply different heating/cooling schedules to each zone at the zone tab without inadvertently affecting other zones. |
2016-06-07 08:49:35 -0500 | commented answer | What should the fuel source for the ASHRAE Baseline Model be when the proposed has a VRF System? Thanks Julien, sorry that was my attempt to differentiate from Xcel's policies on fuel switching in the baseline, which I suspect Brian may also be dealing with. Xcel's modeling protocols often lead us to a different interpretation of Appendix G baselines when there is a mix of fuels. |
2016-06-06 22:52:32 -0500 | answered a question | What should the fuel source for the ASHRAE Baseline Model be when the proposed has a VRF System? If you are delivering outside air to your VRF spaces with a gas-fired DOAS, then you have a gas baseline in the eyes of LEED, period. If you have no gas heating serving those spaces, then you might be able to use the electric baseline:
Good luck! |
2016-03-01 17:27:12 -0500 | answered a question | VRF Control in EnergyPlus A mistake I once made with this system type is that I left the outside air items on the VRF systems to "autosize", thinking that it would just autosize it to come from the DOAS. This inadvertently doubled the outside air to the zones, so that I got double the required OA through the VRF fan coils AND the DOAS. If by chance you did the same, you will need to set this to zero. |
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2015-10-05 15:55:21 -0500 | asked a question | OpenStudio error FindRootSimpleController Hi All, I have a project with several 90.1-2007 App G Baseline System 8 - VAV systems with CHW cooling and electric heating. The model is meeting loads and the simulation completes successfully, but I get a severe error for each CHW coil controller that looks like this: I have triple checked the model and the coil controllers have the correct action. I have heard that this error may show up because of something else going on with airloops, but I can't find anything amiss. The model seems ok otherwise, though I suspect that heating use might be a bit low (multifamily building), which might be triggering this issue: https://github.com/NREL/EnergyPlus/is... Should I be concerned? Any resolution? I am using OpenStudio v1.8.0. Thanks in advance! |
2015-09-22 08:49:35 -0500 | answered a question | OpenStudio - Cannot adjust airflow in one zone Hallelujah, I think I solved this. I changed the zone Cooling Design Air Flow Method from Design Day to Flow/Zone, and finally the airflow popped up to where I wanted it, and loads are met. |
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2015-09-21 14:23:29 -0500 | asked a question | OpenStudio - Cannot adjust airflow in one zone Hi All, I am running an OpenStudio model (v1.8.0) where I seem to have one rogue zone on an airloop where it is the only zone (constant volume PSZ heat pump airloop, operating 24/7 with no setback). I am attempting to increase the cooling minimum airflow in an effort to meet loads, but I cannot seem to adjust the cooling airflow at the zone level. I am trying to change it at the OS:Sizing:Zone level. Everything at the system level is set to autosize. The outside air is correct, but I can't get the zone airflow to go higher than the minimum outside air flow. The OA is around 200 cfm, and the design air flow should be around 600 cfm, but the minimum cooling airflow stubbornly stays no higher than the OA no matter what I try. I have lots of unmet cooling hours for just this zone. Changing the cooling design air flow rate worked just fine for all other zones in the model, even an identical one on the floor below that is set up exactly the same, but for some reason nothing I do seems to impact this particular zone. I have played with the cooling design flow, cooling minimum air flow per zone area, cooling minimum air flow, nothing seems to impact it. If I hard-size the fan I can reduce (not eliminate) the unmet hours, but I still can't change the cooling minimum flow. What am I missing that could be preventing this one single zone from increasing its minimum cooling airflow? Thanks in advance for your advice! |
2015-08-29 16:40:06 -0500 | commented question | PAT 1.8.0 fails on every run It reads the html. But I think I am making it more complicated than it needs to be; I'll just change my spreadsheet to read both ways. Thanks again!!! |
2015-08-29 09:37:15 -0500 | commented question | PAT 1.8.0 fails on every run When I remove the Postprocess measure the other error goes away too. Thank you!! I don't necessarily need that one in PAT so that's not a big deal, but I can talk with Peter about updating it. Thanks again! |
2015-08-29 09:36:06 -0500 | commented question | PAT 1.8.0 fails on every run Yes sorry I had stripped out the EDAPT measure in the one I sent you trying to isolate the error. Both of those measures (IP Units and PostprocessLEED) are from Big Ladder. |
2015-08-28 20:32:44 -0500 | commented question | PAT 1.8.0 fails on every run I just double checked, there are no spaces not assigned to thermal zones. |
2015-08-28 20:27:34 -0500 | commented question | PAT 1.8.0 fails on every run In another version I did have other OS files as design alternatives, but have since stripped them out in an effort to isolate the issue. In this one I now just have the Baseline plus one design alternative with one measure running on the baseline, plus several "Always Run" measures, and both DAs failing. The baseline does not fail if I remove the Xcel EDA QAQC measure. (I do have the most current version from the BCL.) The other design alternative still fails even with that measure removed. The DA uses a simple "change LPD" measure that works just fine everywhere else. |