# \#energyplus

**URL:** https://discourse.ladybug.tools/tag/energyplus/49.md

[Latest](https://discourse.ladybug.tools/latest.md) · [Categories](https://discourse.ladybug.tools/categories.md) · [Tags](https://discourse.ladybug.tools/tags.md)

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## [Problem with Windows Construction Shade](https://discourse.ladybug.tools/t/problem-with-windows-construction-shade/40481)

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**Author:** [@cheruille](https://discourse.ladybug.tools/u/cheruille)\
**Replies:** 12\
**Last updated:** [November 4, 2026, 8:42am UTC](https://discourse.ladybug.tools/t/problem-with-windows-construction-shade/40481 "2026-11-04T08:42:29Z")

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Hi ! I am an architecture student and Im struggling with making aperture shadows. I wanted to make shades (something like roller blinds) that will activate only at night or when my buildings is closed. I wanted to use “H…

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## [Dynamic shade with states for EnergyPlus simulation](https://discourse.ladybug.tools/t/dynamic-shade-with-states-for-energyplus-simulation/23941)

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**Author:** [@ChrsitianDegn](https://discourse.ladybug.tools/u/ChrsitianDegn)\
**Replies:** 6\
**Last updated:** [October 22, 2026, 8:14am UTC](https://discourse.ladybug.tools/t/dynamic-shade-with-states-for-energyplus-simulation/23941 "2026-10-22T08:14:18Z")

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Hello, Is there a way to run an EnergyPlus simulation with dynamic shade groups controlled with states and a schedule similar to how Radiance daylight simulations work now? In practice, I would like to run an EnergyPlu…

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## [Supply and exhaust ventilation included in AirflowNetwork balance for multizonal model](https://discourse.ladybug.tools/t/supply-and-exhaust-ventilation-included-in-airflownetwork-balance-for-multizonal-model/40838)

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**Author:** [@stan](https://discourse.ladybug.tools/u/stan)\
**Replies:** 0\
**Last updated:** [October 9, 2026, 2:15pm UTC](https://discourse.ladybug.tools/t/supply-and-exhaust-ventilation-included-in-airflownetwork-balance-for-multizonal-model/40838 "2026-10-09T14:15:22Z")

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Hello, The question is: Is it possible to model a two-zone ventilation that meet the following criteria: Zone A has mechanical outdoor-air supply but no physical return-air duct. Zone B has mechanical exhaust. The zones…

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## [Fixed Interval Schedule crashes on leap year](https://discourse.ladybug.tools/t/fixed-interval-schedule-crashes-on-leap-year/40798)

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**Author:** [@MatteoMerli](https://discourse.ladybug.tools/u/MatteoMerli)\
**Replies:** 5\
**Last updated:** [September 23, 2026, 9:42am UTC](https://discourse.ladybug.tools/t/fixed-interval-schedule-crashes-on-leap-year/40798 "2026-09-23T09:42:11Z")

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Hi @chris I ran into an issue using fixed schedules with leap years. The Fixed Interval Schedule component expects 8760 values (standard year, timestep = 1), but I am running a leap year (2024), and if i supply 8784 va…

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## [Ironbug radiant system setup issues](https://discourse.ladybug.tools/t/ironbug-radiant-system-setup-issues/40790)

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**Author:** [@Makaella](https://discourse.ladybug.tools/u/Makaella)\
**Replies:** 1\
**Last updated:** [September 17, 2026, 6:06pm UTC](https://discourse.ladybug.tools/t/ironbug-radiant-system-setup-issues/40790 "2026-09-17T18:06:37Z")

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Hello! I have applied the construction for “INTERNAL SOURCE”, and have checked the construction attribute of the surface and ground. then use the rooms for creating an HB Model. But always receive the error message as fo…

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## [Dewbee: a plugin for heat and moisture transfer (HAMT) in Grasshopper](https://discourse.ladybug.tools/t/dewbee-a-plugin-for-heat-and-moisture-transfer-hamt-in-grasshopper/40314)

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**Author:** [@gzorzeto](https://discourse.ladybug.tools/u/gzorzeto)\
**Replies:** 11\
**Last updated:** [August 27, 2026, 4:08pm UTC](https://discourse.ladybug.tools/t/dewbee-a-plugin-for-heat-and-moisture-transfer-hamt-in-grasshopper/40314 "2026-08-27T16:08:46Z")

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Dear Ladybug Tools Community, Welcome Dewbee, a Honeybee extension to run heat and moisture transfer (HAMT) simulations in Grasshopper! Dewbee basically activates the Combined Heat and Moisture Transfer algorithm in En…

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## [Free Future Meteorological Years (FMYs) for 5,000+ European locations](https://discourse.ladybug.tools/t/free-future-meteorological-years-fmys-for-5-000-european-locations/40704)

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**Author:** [@LittleBuddha](https://discourse.ladybug.tools/u/LittleBuddha)\
**Replies:** 0\
**Last updated:** [August 20, 2026, 10:52am UTC](https://discourse.ladybug.tools/t/free-future-meteorological-years-fmys-for-5-000-european-locations/40704 "2026-08-20T10:52:10Z")

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Following on from our TMY release, we’re excited to announce that Future Meteorological Years (FMYs) are now available on ClimateDataForBuildings.eu — giving practitioners a free, simulation-ready way to design for the c…

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## [Changing HPHW efficiency does not impact results on a large building](https://discourse.ladybug.tools/t/changing-hphw-efficiency-does-not-impact-results-on-a-large-building/40500)

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**Author:** [@jdelaneybbb](https://discourse.ladybug.tools/u/jdelaneybbb)\
**Replies:** 1\
**Last updated:** [August 10, 2026, 2:35pm UTC](https://discourse.ladybug.tools/t/changing-hphw-efficiency-does-not-impact-results-on-a-large-building/40500 "2026-08-10T14:35:10Z")

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Hello, I have a large complex model for a multifamily residential building. I am looking to compare the energy impacts of different water heating configurations (gas, hphw, geothermal). This is a building with over 400 …

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## [Earth Tube - DOAS Supply Air Temp HB 1.2 - Ironbug?](https://discourse.ladybug.tools/t/earth-tube-doas-supply-air-temp-hb-1-2-ironbug/15346)

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**Author:** [@jgbrear](https://discourse.ladybug.tools/u/jgbrear)\
**Replies:** 3\
**Last updated:** [August 8, 2026, 10:17am UTC](https://discourse.ladybug.tools/t/earth-tube-doas-supply-air-temp-hb-1-2-ironbug/15346 "2026-08-08T10:17:12Z")

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Hello Honeybee Modelers, TLDR: I want to model an earth tube that precools air before it reaches the DOAS in HB 1.2.0 I noticed that HB Legacy had an earth tube component which presumably was referencing this Zone Eart…

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## [Annual Cooling and Heating Loads Are Much Higher Than Expected for a Single Office Model](https://discourse.ladybug.tools/t/annual-cooling-and-heating-loads-are-much-higher-than-expected-for-a-single-office-model/40649)

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**Author:** [@goldmoon](https://discourse.ladybug.tools/u/goldmoon)\
**Replies:** 3\
**Last updated:** [August 5, 2026, 8:41am UTC](https://discourse.ladybug.tools/t/annual-cooling-and-heating-loads-are-much-higher-than-expected-for-a-single-office-model/40649 "2026-08-05T08:41:30Z")

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Hello everyone, I am an undergraduate student from South Korea conducting my graduation research using Honeybee and Ladybug Tools. I would really appreciate any advice. I am simulating a single office space inside an o…

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## [Green wall (vertical greenery system)](https://discourse.ladybug.tools/t/green-wall-vertical-greenery-system/40610)

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**Author:** [@Tiyara](https://discourse.ladybug.tools/u/Tiyara)\
**Replies:** 0\
**Last updated:** [July 28, 2026, 3:45pm UTC](https://discourse.ladybug.tools/t/green-wall-vertical-greenery-system/40610 "2026-07-28T15:45:48Z")

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Hi everyone, I’m working on a Honeybee/EnergyPlus energy simulation . My goal is to compare several façade systems based on Energy Use Intensity (EUI), heating, and cooling loads. I’m now trying to model a green wall (…

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## [Honeybee Outdoor Comfort Simulation Hung up at 94/97 "Tasks" after 8 hours](https://discourse.ladybug.tools/t/honeybee-outdoor-comfort-simulation-hung-up-at-94-97-tasks-after-8-hours/40563)

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**Author:** [@remyweather](https://discourse.ladybug.tools/u/remyweather)\
**Replies:** 11\
**Last updated:** [July 28, 2026, 12:34pm UTC](https://discourse.ladybug.tools/t/honeybee-outdoor-comfort-simulation-hung-up-at-94-97-tasks-after-8-hours/40563 "2026-07-28T12:34:09Z")

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Afternoon, Continuing my exploration of getting honeybee / LB outdoor comfort script to work, testing on a dumb simple model of Bryant Park in NYC. Tried a couple of times, and the simulation seems to get hung up at 94…

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## [How to model a thermally activated exterior wall in Honeybee?](https://discourse.ladybug.tools/t/how-to-model-a-thermally-activated-exterior-wall-in-honeybee/40524)

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**Author:** [@Mulimark](https://discourse.ladybug.tools/u/Mulimark)\
**Replies:** 5\
**Last updated:** [July 27, 2026, 5:38am UTC](https://discourse.ladybug.tools/t/how-to-model-a-thermally-activated-exterior-wall-in-honeybee/40524 "2026-07-27T05:38:48Z")

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Hi all, I am currently working on a parametric study in Grasshopper/Honeybee and would like to model a thermally activated exterior wall. The wall assembly is roughly: Room | 20cm Concrete (thermal mass) | ~3cm rend…

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## [Parametric louvered second skin facade in Honeybee](https://discourse.ladybug.tools/t/parametric-louvered-second-skin-facade-in-honeybee/40575)

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**Author:** [@Tiyara](https://discourse.ladybug.tools/u/Tiyara)\
**Replies:** 4\
**Last updated:** [July 20, 2026, 6:43pm UTC](https://discourse.ladybug.tools/t/parametric-louvered-second-skin-facade-in-honeybee/40575 "2026-07-20T18:43:50Z")

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Hello ,I am working on a thesis project in Rhino 7 + Grasshopper + Ladybug Tools 1.x, and I am comparing different facade scenarios for an office-commercial building. One of the scenarios is a double-layer facade where …

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## [Read the outdoor surface temperature out from the UTCI](https://discourse.ladybug.tools/t/read-the-outdoor-surface-temperature-out-from-the-utci/40509)

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**Author:** [@LaFleur](https://discourse.ladybug.tools/u/LaFleur)\
**Replies:** 3\
**Last updated:** [June 27, 2026, 10:54pm UTC](https://discourse.ladybug.tools/t/read-the-outdoor-surface-temperature-out-from-the-utci/40509 "2026-06-27T22:54:38Z")

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Hallo dear community, I read that the UTCI component, to reach the calculation for this matrix, simulate through E+ the surface temperatures but the environmental conditions don´t show this result. Would it be p…

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## [HB Shade not working](https://discourse.ladybug.tools/t/hb-shade-not-working/24564)

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**Author:** [@deepthi.ravi](https://discourse.ladybug.tools/u/deepthi.ravi)\
**Replies:** 7\
**Last updated:** [June 24, 2026, 1:46pm UTC](https://discourse.ladybug.tools/t/hb-shade-not-working/24564 "2026-06-24T13:46:05Z")

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The results for the energy analysis does not change irrespective of adding HB shades or not. I initially assumed that the shades are probably not too deep and hence there is no effect, but I tried adding very long overha…

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## [Modeling a Green Roof in Honeybee for Building Energy Performance Analysis](https://discourse.ladybug.tools/t/modeling-a-green-roof-in-honeybee-for-building-energy-performance-analysis/40448)

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**Author:** [@Maronaa](https://discourse.ladybug.tools/u/Maronaa)\
**Replies:** 1\
**Last updated:** [June 18, 2026, 4:55pm UTC](https://discourse.ladybug.tools/t/modeling-a-green-roof-in-honeybee-for-building-energy-performance-analysis/40448 "2026-06-18T16:55:18Z")

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Hello, I have already tried using the Green Roof component in Honeybee, but I am not sure where exactly it should be connected or assigned within the workflow. I would like to evaluate the impact of a green roof on buil…

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## [Adding IndoorLivingWall to HB](https://discourse.ladybug.tools/t/adding-indoorlivingwall-to-hb/40484)

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**Author:** [@camus](https://discourse.ladybug.tools/u/camus)\
**Replies:** 1\
**Last updated:** [June 17, 2026, 1:59am UTC](https://discourse.ladybug.tools/t/adding-indoorlivingwall-to-hb/40484 "2026-06-17T01:59:03Z")

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Is there a way to add this new IndoorLivingWall module Energy Plus has to HB? On the same page linked there’s also has an example IDF, but how do I add this in GH? - should this be added as a layer in construction like a…

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## [EnergyPlus version runtime error - The installed EnergyPlus is 23.2.0. Must be version 24.2.0 or greater](https://discourse.ladybug.tools/t/energyplus-version-runtime-error-the-installed-energyplus-is-23-2-0-must-be-version-24-2-0-or-greater/36581)

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**Author:** [@YogeshGooljar](https://discourse.ladybug.tools/u/YogeshGooljar)\
**Replies:** 8\
**Last updated:** [May 7, 2025, 4:14pm UTC](https://discourse.ladybug.tools/t/energyplus-version-runtime-error-the-installed-energyplus-is-23-2-0-must-be-version-24-2-0-or-greater/36581 "2025-05-07T16:14:03Z")

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Hi, I am using Rhino v7 and LBT 1.8. The Annual Loads component which I am using is marked as 1.8.2. I have OpenStudio v3.9.o installed and Open Studio App v1.9.0 installed. When I checked the EnergyPlus version in the…

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## [Indoor Temperature 10°C Above Outdoor and 16°C Above Setpoint in ASHRAE Climate Zone 7 – HB Ideal Air](https://discourse.ladybug.tools/t/indoor-temperature-10-c-above-outdoor-and-16-c-above-setpoint-in-ashrae-climate-zone-7-hb-ideal-air/40430)

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**Author:** [@Alice2](https://discourse.ladybug.tools/u/Alice2)\
**Replies:** 3\
**Last updated:** [June 1, 2026, 4:42am UTC](https://discourse.ladybug.tools/t/indoor-temperature-10-c-above-outdoor-and-16-c-above-setpoint-in-ashrae-climate-zone-7-hb-ideal-air/40430 "2026-06-01T04:42:09Z")

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Hi everyone, I’m currently running building energy simulations across all 19 ASHRAE climate zones using Ladybug Tools in Grasshopper. For each climate zone, I’m using the software’s built-in default constructions that c…

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## [How to simulation Thermochrom/PCM exterior wall in Energy plus with EMS](https://discourse.ladybug.tools/t/how-to-simulation-thermochrom-pcm-exterior-wall-in-energy-plus-with-ems/40429)

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**Author:** [@Salehfallaham](https://discourse.ladybug.tools/u/Salehfallaham)\
**Replies:** 0\
**Last updated:** [May 31, 2026, 10:42am UTC](https://discourse.ladybug.tools/t/how-to-simulation-thermochrom-pcm-exterior-wall-in-energy-plus-with-ems/40429 "2026-05-31T10:42:42Z")

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“I want to model an external coating with EnergyPlus so that when the external surface temperature reaches 25°C, the coating starts absorbing heat through a phase change material until 26°C, and simultaneously the solar …

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## [Is it possible to convert a Rhino 3D model to a geometry model compatible for an energy simulation?](https://discourse.ladybug.tools/t/is-it-possible-to-convert-a-rhino-3d-model-to-a-geometry-model-compatible-for-an-energy-simulation/40420)

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**Author:** [@AESB99](https://discourse.ladybug.tools/u/AESB99)\
**Replies:** 6\
**Last updated:** [May 28, 2026, 6:27pm UTC](https://discourse.ladybug.tools/t/is-it-possible-to-convert-a-rhino-3d-model-to-a-geometry-model-compatible-for-an-energy-simulation/40420 "2026-05-28T18:27:36Z")

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Hello everyone! I am currently working on an energy simulation project using OpenStudio (OSM) and I received a 3D model from the architect, built in Rhino. I was wondering if there is a way to convert this geometry into…

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## [Honeybee Schedules and Construction Libraries](https://discourse.ladybug.tools/t/honeybee-schedules-and-construction-libraries/40300)

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**Author:** [@frnicolas77](https://discourse.ladybug.tools/u/frnicolas77)\
**Replies:** 5\
**Last updated:** [May 21, 2026, 3:42pm UTC](https://discourse.ladybug.tools/t/honeybee-schedules-and-construction-libraries/40300 "2026-05-21T15:42:40Z")

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Hello community, It’s my first time using Honeybee Energy. I am moving from Climate Studio to this great open-source tool. But I’m encountering some limitations on its defaults in order to build up the model. I would l…

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## [Question regarding HB to OSM custom energy results (solar transmission between zones)](https://discourse.ladybug.tools/t/question-regarding-hb-to-osm-custom-energy-results-solar-transmission-between-zones/40402)

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**Author:** [@adnan\_2171](https://discourse.ladybug.tools/u/adnan_2171)\
**Replies:** 2\
**Last updated:** [May 21, 2026, 6:41am UTC](https://discourse.ladybug.tools/t/question-regarding-hb-to-osm-custom-energy-results-solar-transmission-between-zones/40402 "2026-05-21T06:41:37Z")

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Hello Everyone, I have a question regarding Honeybee custom energy results in HB to OSM simulations. I have a model with two zones: 1- Outer zone with exterior windows 2- Inner zone connected through adjacent/interio…

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## [Unusually High Cooling, Pump, and Heat Rejection Energy Values in Weekly Ironbug/Honeybee Simulation](https://discourse.ladybug.tools/t/unusually-high-cooling-pump-and-heat-rejection-energy-values-in-weekly-ironbug-honeybee-simulation/40354)

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**Author:** [@Dhanushkodi](https://discourse.ladybug.tools/u/Dhanushkodi)\
**Replies:** 0\
**Last updated:** [May 7, 2026, 12:48pm UTC](https://discourse.ladybug.tools/t/unusually-high-cooling-pump-and-heat-rejection-energy-values-in-weekly-ironbug-honeybee-simulation/40354 "2026-05-07T12:48:17Z")

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Hi everyone, I am working on an HVAC simulation in Ironbug/Honeybee and I am facing an issue with unusually high energy values during a 1-week simulation period. I would appreciate any help in diagnosing whether this is…

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## [Fails to find CuPY / CUDA dll no matter the version](https://discourse.ladybug.tools/t/fails-to-find-cupy-cuda-dll-no-matter-the-version/40351)

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**Author:** [@remyweather](https://discourse.ladybug.tools/u/remyweather)\
**Replies:** 7\
**Last updated:** [May 6, 2026, 5:39pm UTC](https://discourse.ladybug.tools/t/fails-to-find-cupy-cuda-dll-no-matter-the-version/40351 "2026-05-06T17:39:50Z")

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hi @chris @MingboPeng Honeybee recipe’s are failing to load CuPY and CUDA when running scripts. I have tried various combinations of Cupy/CUDA to no avail. I receive one of the following errors: FileNotFoundError: Coul…

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## [Evaporative cooler in Ladybug tools 10.1](https://discourse.ladybug.tools/t/evaporative-cooler-in-ladybug-tools-10-1/40324)

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**Author:** [@Rom1](https://discourse.ladybug.tools/u/Rom1)\
**Replies:** 2\
**Last updated:** [May 4, 2026, 9:46am UTC](https://discourse.ladybug.tools/t/evaporative-cooler-in-ladybug-tools-10-1/40324 "2026-05-04T09:46:50Z")

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Dear all, Did already someone managed to model an evaporative cooler on a Air Handling Unit in Ladybug? Would you have an example to share please? Kind regards,

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## [Window ventilation +AFN (Generic Contaminant)](https://discourse.ladybug.tools/t/window-ventilation-afn-generic-contaminant/40320)

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**Author:** [@Amany.khalil](https://discourse.ladybug.tools/u/Amany.khalil)\
**Replies:** 1\
**Last updated:** [April 28, 2026, 9:02pm UTC](https://discourse.ladybug.tools/t/window-ventilation-afn-generic-contaminant/40320 "2026-04-28T21:02:44Z")

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Hi @mostapha, @chris and All I am trying to simulate PM2.5 as a generic contaminant. I have added PM2.5 alongside CO₂ using additional strings, and also included moisture in the same way. I have set up window ventilatio…

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## [Impossibly high loads in HB LoadBalance results](https://discourse.ladybug.tools/t/impossibly-high-loads-in-hb-loadbalance-results/40328)

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**Author:** [@Roof\_of\_the\_Fop](https://discourse.ladybug.tools/u/Roof_of_the_Fop)\
**Replies:** 3\
**Last updated:** [April 28, 2026, 3:25pm UTC](https://discourse.ladybug.tools/t/impossibly-high-loads-in-hb-loadbalance-results/40328 "2026-04-28T15:25:36Z")

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Does anyone know any common reasons why the loads (specifically only conduction, infiltration, and solar gains) are so extremely large. There is obviously no reality where a month could have a solar gain of 6,268 kWh/m2.…

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## ["HB Airflow Network" operable horizontal windows](https://discourse.ladybug.tools/t/hb-airflow-network-operable-horizontal-windows/40315)

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**Author:** [@adnan\_2171](https://discourse.ladybug.tools/u/adnan_2171)\
**Replies:** 2\
**Last updated:** [April 26, 2026, 12:52am UTC](https://discourse.ladybug.tools/t/hb-airflow-network-operable-horizontal-windows/40315 "2026-04-26T00:52:01Z")

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Dear all, I’m working with the Honeybee Airflow Network and I have two types of openings: External windows for natural ventilation → working fine Internal (inter-zone) opening between two rooms → horizontal When I se…

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