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2026-04-13 19:21:22 -0500 answered a question Weather file not running in BEopt

BEopt is supposed to create the weather cache file on the fly but there appear to be situations where it doesn't. If you

2026-03-19 16:44:07 -0500 answered a question Is the supply-air temperature a variable that exists among the outputs in BeOpt?

BEopt does not make the hourly supply air temperatures available to the user. Though if you are proficient at using Ener

2026-03-09 13:50:25 -0500 commented answer BEopt Room AC % Conditioned

I am running v3b on Windows 11 without a problem and I know many others are as well. If you can provide any information

2026-03-09 13:35:51 -0500 edited answer BEopt Room AC % Conditioned

The intent of the Energy Multiplier is indeed to scale the energy use of the RAC(s) relative to 100% coverage. I created

2026-03-09 13:32:32 -0500 answered a question BEopt Room AC % Conditioned

The intent of the Energy Multiplier is indeed to scale the energy use of the RAC(s) relative to 100% coverage. I created

2026-03-08 12:54:16 -0500 answered a question How to prevent grid charging when using `TrackChargeDischargeSchedules` in `ElectricLoadCenter:Distribution`?

Have you tried using TrackFacilityElectricDemandStoreExcessOnSite for the Storage Operation Scheme? As per the documenta

2026-03-08 12:41:00 -0500 commented question BEopt Room AC % Conditioned

Can you share your BEopt file via Google Drive or Dropbox?

2026-02-26 10:27:50 -0500 received badge  Rapid Responder (source)
2026-02-26 10:27:50 -0500 answered a question Feature Request / Discussion — ZoneList Support as Key Value in Output:Variable and Meter:Custom

Not a full solution, but note that E+ 8.7 and newer allow you to use regular expressions in Output:Variable. It obviousl

2026-02-11 16:55:09 -0500 commented question beopt, How do you upload TMY3 data to the software downloaded from the NSRDB data viewer

I'd suggest using the Gunnison TMY3 weather file. It's at similar elevation to Salida and should have similar weather.

2026-02-09 09:56:18 -0500 answered a question Partially underground floor with Open studio + Sketchup plugin.

It sounds like you are referring to a walkout basement. The best model in EnergyPlus for this foundation type is Kiva. I

2026-02-05 16:41:39 -0500 answered a question The website https://bcl.nrel.gov/ is not working...

It was indeed down for a couple days, but is back up as of Jan 28. Credit to @kflemin.

2026-01-21 14:50:02 -0500 commented answer How Do I set the "Field Set: Surface Name, Fraction of Radiant Energy to Surface" parameter for my "ZoneHVACCoolingPanelRadiantConvectiveWater" using OpenStudioSDK

Seems worth requesting these inputs as an enhancement at https://github.com/NREL/OpenStudio/issues

2026-01-20 11:58:01 -0500 received badge  Rapid Responder (source)
2026-01-20 11:58:01 -0500 answered a question Duct Leakage in EnergyPlus

There are two main approaches: Use Airflow Network: This is a detailed, pressure-based calculation. It can handle comp

2026-01-07 10:41:44 -0500 received badge  Rapid Responder (source)
2026-01-07 10:41:44 -0500 answered a question OpenStudio Radiance Measure

The error message says "Perl could not be found in path". You need to install perl and then add it to your PATH.

2025-12-02 10:46:59 -0500 commented answer ResStock building model generation

It shouldn't have produced an IDF, I filed a bug report here. You basically asked for one datapoint, which did not meet

2025-12-02 10:46:09 -0500 commented answer ResStock building model generation

It shouldn't have produced an IDF, I filed a bug report here. You basically asked for one datapoint, which did not meet

2025-12-02 10:21:19 -0500 commented answer EMS does not turn off ideal load

Another option is to actuate the Heating/Cooling Availability Schedules (e.g., here) instead of the setpoint.

2025-12-02 10:19:22 -0500 commented answer EMS does not turn off ideal load

Have you tried using the Output:EnergyManagementSystem object to verify that your EMS program is doing what you expect?

2025-12-01 11:23:57 -0500 edited answer How does E+ determine wind pressure coefficients on surfaces that face an internal yard within the building?

EnergyPlus is not a CFD program. As described under Wind Pressure Coefficient Type, the default option of SurfaceAverage

2025-12-01 11:23:07 -0500 answered a question How does E+ determine wind pressure coefficients on surfaces that face an internal yard within the building?

EnergyPlus is not a CFD program. As described under Wind Pressure Coefficient Type, the default option of SurfaceAverage

2025-12-01 11:11:57 -0500 answered a question EMS does not turn off ideal load

One common approach to disabling an HVAC system using EMS is to change the setpoint schedule so that the setpoint is ver

2025-12-01 11:11:57 -0500 received badge  Rapid Responder (source)
2025-11-24 19:02:39 -0500 commented question error "Creating GenericModelObject for IddObjectType 'CommentOnly’

It's not an error, it's a warning. Maybe @"Julien Marrec" knows why it's happening. But I'm guessing it's safe to ignore

2025-11-24 19:02:14 -0500 commented question error "Creating GenericModelObject for IddObjectType 'CommentOnly’

It's not an error, it's a warning. Maybe @Julien Marrec knows why it's happening. But I'm guessing it's safe to ignore -

2025-11-24 10:17:48 -0500 edited answer Rotating PV in EnergyPlus

The PVWatts model has the ability to model one axis and two axis rotating arrays. See the Array Type field.

2025-11-23 09:05:29 -0500 received badge  Rapid Responder (source)
2025-11-23 09:05:29 -0500 answered a question Rotating PV in EnergyPlus

The PVWatts model has the ability to model one axis and two axis rotating arrays. See the Array Type field.

2025-11-21 16:51:50 -0500 received badge  Rapid Responder (source)
2025-11-21 16:51:50 -0500 answered a question EV behaviour for different timestep lengths

If I understand correctly, you changed the IDF timestep to hourly but used the same 15-min stochastic schedule CSV. If y

2025-11-20 15:57:10 -0500 commented question self discharge rate for battery

I'm not answering the question, but isn't it a really small effect? According to https://www.ufinebattery.com/blog/why-d

2025-11-20 14:04:03 -0500 commented question Conversion of HPXML to OSM with Python

Can you ask that in a new Unmet Hours question? That is a ResStock/stochastic occupancy model question and not related t

2025-11-13 22:15:09 -0500 commented question Anyone know when Version 25.2.0 will be posted?

Might be tomorrow, according to https://github.com/NREL/EnergyPlus/releases/tag/v25.2.0-RC3

2025-11-12 09:51:59 -0500 commented question Conversion of HPXML to OSM with Python

You can use the -m or --measures_only flag to skip the simulations. If you use --help, you can see all of the run_analys

2025-11-07 08:42:21 -0500 commented answer Direct ON-OFF Access to Heating/Cooling System via Python API

Have you seen the Temperature Difference Between Cutout And Setpoint field? It allows modeling the on/off cycling of equ

2025-11-07 08:42:04 -0500 commented answer Direct ON-OFF Access to Heating/Cooling System via Python API

Have you seen the Temperature Difference Between Cutout And Setpoint? It allows modeling the on/off cycling of equipment

2025-11-07 08:36:16 -0500 edited answer What's the workflow for importing the NREL HPXML into OpenStudio?

It's not as easy as it probably should be, but the simplest path is to use the same versions of ResStock and OpenStudio

2025-11-06 15:05:18 -0500 commented question Conversion of HPXML to OSM with Python

There is some description of how to do this for an earlier ResStock dataset, but I imagine most of it applies. See here

2025-11-06 11:40:38 -0500 commented question Conversion of HPXML to OSM with Python

Can you say where your HPXML file came from? There are lots of different flavors of HPXML files (some specifically used

2025-11-04 09:02:04 -0500 commented answer Negative cooling load

That issue would not cause a negative cooling load, just a mis-sized cooling system. I also ran the file with your EPW a

2025-10-30 16:07:21 -0500 answered a question Output:Variable customization

You should be able to do this using the Meter:Custom and Meter:CustomDecrement objects. These will create custom meters

2025-10-30 16:07:21 -0500 received badge  Rapid Responder (source)
2025-10-29 17:16:54 -0500 commented question Energyplus chiller curve dataset bug

Alternatively, you can report a bug at https://github.com/NREL/EnergyPlus/issues to have an EnergyPlus developer work on

2025-10-29 17:12:06 -0500 commented question Energyplus chiller curve dataset bug

The Energy+.idd file should be the source of truth. If you want to contribute to EnergyPlus, see the contribution policy

2025-10-27 16:45:14 -0500 commented answer Missing EMS Actuator for Unitary Heat Pump air-to-air

It is simply not available. You could request the feature at https://github.com/NREL/EnergyPlus/issues if you want, I do

2025-10-27 16:00:12 -0500 answered a question Missing EMS Actuator for Unitary Heat Pump air-to-air

EMS is used to change building values during the simulation (e.g., look at a value calculated during one timestep and ch

2025-10-27 16:00:12 -0500 received badge  Rapid Responder (source)
2025-10-27 10:31:37 -0500 commented question EnergyPlus Crashes When Adding Windows to Rotating Building Model Using Site:VariableLocation

EnergyPlus should never crash. And I can confirm the Name field is being incorrectly ignored, it's in the IDD/documentat