# ironbug

**URL:** https://discourse.ladybug.tools/c/grasshopper/ironbug/35.md

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

---

## [About the ironbug category](https://discourse.ladybug.tools/t/about-the-ironbug-category/5240)

<div class="topic-metadata">

**Author:** [@admin](https://discourse.ladybug.tools/u/admin)\
**Replies:** 0

</div>

---

## [Ironbug testing on macOS](https://discourse.ladybug.tools/t/ironbug-testing-on-macos/40812)

<div class="topic-metadata">

**Author:** [@furtonb](https://discourse.ladybug.tools/u/furtonb)\
**Replies:** 9\
**Last updated:** [October 12, 2026, 10:27pm UTC](https://discourse.ladybug.tools/t/ironbug-testing-on-macos/40812 "2026-10-12T22:27:54Z")

</div>

Hi guys, @MingboPeng 's recent PR just came across on my Github feed (PR #159, released in v1.26.1): It was released last week and I found nothing about it on the forum, so I felt the natural urge to jump in, and as…

---

## [RadiantVFlow Blocks simulation to OSM](https://discourse.ladybug.tools/t/radiantvflow-blocks-simulation-to-osm/40844)

<div class="topic-metadata">

**Author:** [@Emesisblue](https://discourse.ladybug.tools/u/Emesisblue)\
**Replies:** 0\
**Last updated:** [October 11, 2026, 9:13am UTC](https://discourse.ladybug.tools/t/radiantvflow-blocks-simulation-to-osm/40844 "2026-10-11T09:13:45Z")

</div>

Good evening, sorry to bother you. I’m trying to run a simulation with RadiantVFlow. I believe I’ve set up the hot and cold water loops correctly and connected the branches, using Internal Source components. The problem …

---

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

<div class="topic-metadata">

**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")

</div>

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…

---

## [Radiator and floor heating combination simulation issue](https://discourse.ladybug.tools/t/radiator-and-floor-heating-combination-simulation-issue/40640)

<div class="topic-metadata">

**Author:** [@Akos](https://discourse.ladybug.tools/u/Akos)\
**Replies:** 3\
**Last updated:** [September 2, 2026, 5:58pm UTC](https://discourse.ladybug.tools/t/radiator-and-floor-heating-combination-simulation-issue/40640 "2026-09-02T17:58:05Z")

</div>

Hi there, i would like to build up a model with BaseboardWaterC (radiator) and (RadiantVFlow) floor heating (only heating). I set up the Loops (also the domestic hotwater). I also added an internal source in the floor f…

---

## [Ironbug Chilled Water Loop Demand Branches erros](https://discourse.ladybug.tools/t/ironbug-chilled-water-loop-demand-branches-erros/40559)

<div class="topic-metadata">

**Author:** [@Makaella](https://discourse.ladybug.tools/u/Makaella)\
**Replies:** 2\
**Last updated:** [July 29, 2026, 7:17am UTC](https://discourse.ladybug.tools/t/ironbug-chilled-water-loop-demand-branches-erros/40559 "2026-07-29T07:17:05Z")

</div>

Hi I am a new user of Grasshopper and Ironbug. I am currently carrying out building HVAC system simulations for typical cities in northern China. The system I aim to build features centralized hot water floor radiant h…

---

## [UnitarySystem No Load Supply Air Flow Rate](https://discourse.ladybug.tools/t/unitarysystem-no-load-supply-air-flow-rate/40539)

<div class="topic-metadata">

**Author:** [@grahamjlinn](https://discourse.ladybug.tools/u/grahamjlinn)\
**Replies:** 2\
**Last updated:** [July 21, 2026, 6:05pm UTC](https://discourse.ladybug.tools/t/unitarysystem-no-load-supply-air-flow-rate/40539 "2026-07-21T18:05:15Z")

</div>

Hi IronBug folks, I think I’ve found an issue. I’m trying to set up a DOAS AirLoop using a UnitarySystem so I can have integrated geo source heat pump coils. I’ve stumbled on a configuration thing - it seems in order to…

---

## [DOAS + PTHP Setup](https://discourse.ladybug.tools/t/doas-pthp-setup/39968)

<div class="topic-metadata">

**Author:** [@nomoreruntimeerrorPlz](https://discourse.ladybug.tools/u/nomoreruntimeerrorPlz)\
**Replies:** 1\
**Last updated:** [July 17, 2026, 1:54am UTC](https://discourse.ladybug.tools/t/doas-pthp-setup/39968 "2026-07-17T01:54:13Z")

</div>

Hi everyone, I am working on a residential energy model in Honeybee using Ironbug to build a custom HVAC system. My goal is to simulate a PTHP (Packaged Terminal Heat Pump) for heating/cooling and a DOAS (Dedicated Outd…

---

## [QuadLinear and QuintLinear Curves](https://discourse.ladybug.tools/t/quadlinear-and-quintlinear-curves/40537)

<div class="topic-metadata">

**Author:** [@Elliot\_Glassman](https://discourse.ladybug.tools/u/Elliot_Glassman)\
**Replies:** 1\
**Last updated:** [July 17, 2026, 12:00am UTC](https://discourse.ladybug.tools/t/quadlinear-and-quintlinear-curves/40537 "2026-07-17T00:00:31Z")

</div>

I am working on a project with one of the HVAC options being a WSHP. Some of the parametric options with this system type ran fine, but some ended in an error with the condensor loop having impossibly extreme loop temper…

---

## [IronBug VRF + DOAS template exports OA flow as Autosize instead of fixed room values](https://discourse.ladybug.tools/t/ironbug-vrf-doas-template-exports-oa-flow-as-autosize-instead-of-fixed-room-values/40549)

<div class="topic-metadata">

**Author:** [@LuizHVAC](https://discourse.ladybug.tools/u/LuizHVAC)\
**Replies:** 1\
**Last updated:** [July 16, 2026, 10:24pm UTC](https://discourse.ladybug.tools/t/ironbug-vrf-doas-template-exports-oa-flow-as-autosize-instead-of-fixed-room-values/40549 "2026-07-16T22:24:14Z")

</div>

Hi @MingboPeng I’m modeling a school building using Honeybee + IronBug. The full model has around 88 thermal zones, and I am using a VRF + DOAS setup created with IronBug. The intended system is: VRF terminal units → …

---

## [Issues with adding EMS to Simulation](https://discourse.ladybug.tools/t/issues-with-adding-ems-to-simulation/40556)

<div class="topic-metadata">

**Author:** [@Elliot\_Glassman](https://discourse.ladybug.tools/u/Elliot_Glassman)\
**Replies:** 1\
**Last updated:** [July 16, 2026, 9:57pm UTC](https://discourse.ladybug.tools/t/issues-with-adding-ems-to-simulation/40556 "2026-07-16T21:57:44Z")

</div>

Trying my first forays into the use of EMS in Ironbug and running into some frustrating problems. I got an error when I tried to run. The SaveToFile component says: “An item with the same key has already been added” I…

---

## [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)

<div class="topic-metadata">

**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")

</div>

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…

---

## [Connecting ASHP with PV+Battery system](https://discourse.ladybug.tools/t/connecting-ashp-with-pv-battery-system/39997)

<div class="topic-metadata">

**Author:** [@Sania](https://discourse.ladybug.tools/u/Sania)\
**Replies:** 6\
**Last updated:** [March 25, 2026, 3:59pm UTC](https://discourse.ladybug.tools/t/connecting-ashp-with-pv-battery-system/39997 "2026-03-25T15:59:49Z")

</div>

Hi @MingboPeng, @chris and @mostapha, I’m trying to optimaze the battery capacity for my building, which is a 3 rooms office with an HVAC system based on an air source heat pump and a MVHR. In attached you can find the …

---

## [Ironbug Pipe:Indoor object missing?](https://discourse.ladybug.tools/t/ironbug-pipe-indoor-object-missing/36911)

<div class="topic-metadata">

**Author:** [@furtonb](https://discourse.ladybug.tools/u/furtonb)\
**Replies:** 1\
**Last updated:** [March 23, 2026, 2:09pm UTC](https://discourse.ladybug.tools/t/ironbug-pipe-indoor-object-missing/36911 "2026-03-23T14:09:27Z")

</div>

Hi @MingboPeng , I’m looking for the Pipe:Indoor equivalent in Ironbug, but I fail to find it (outdoor and adiabatic options are in the loop component objects): I’ve looked at the Github repo and couldn’t find the s…

---

## [Plant Component Scheme](https://discourse.ladybug.tools/t/plant-component-scheme/40114)

<div class="topic-metadata">

**Author:** [@Elliot\_Glassman](https://discourse.ladybug.tools/u/Elliot_Glassman)\
**Replies:** 1\
**Last updated:** [March 23, 2026, 9:09am UTC](https://discourse.ladybug.tools/t/plant-component-scheme/40114 "2026-03-23T09:09:45Z")

</div>

Is there any information about how Ironbug is creating the plant operation schemes or ways of modifying them? The image below is from the IDF showing the HeatingLoad scheme, then the Component Setpoint as the second cont…

---

## [Possibility of Integration of IronBug Load Center Components with Dragonfly/URBANopt](https://discourse.ladybug.tools/t/possibility-of-integration-of-ironbug-load-center-components-with-dragonfly-urbanopt/39445)

<div class="topic-metadata">

**Author:** [@behnammmohseni](https://discourse.ladybug.tools/u/behnammmohseni)\
**Replies:** 5\
**Last updated:** [February 11, 2026, 6:23pm UTC](https://discourse.ladybug.tools/t/possibility-of-integration-of-ironbug-load-center-components-with-dragonfly-urbanopt/39445 "2026-02-11T18:23:06Z")

</div>

Hi @MingboPeng I hope you are pretty well. Thank you very much for your time and effort in developing the Load Center components for IronBug. I was wondering how these components can be integrated into Dragonfly model…

---

## [Possibility to have solar collector in Ironbug](https://discourse.ladybug.tools/t/possibility-to-have-solar-collector-in-ironbug/36269)

<div class="topic-metadata">

**Author:** [@behnammmohseni](https://discourse.ladybug.tools/u/behnammmohseni)\
**Replies:** 30\
**Last updated:** [January 2, 2026, 2:50pm UTC](https://discourse.ladybug.tools/t/possibility-to-have-solar-collector-in-ironbug/36269 "2026-01-02T14:50:53Z")

</div>

Hey @MingboPeng I hope you are pretty well. I noticed there is a cs file in the Ironbug about the solar collector, which at the moment is commented as below: Would you kindly let me know whether it is possible to ha…

---

## [Possibility of developing Solar Collector Flat Plate Photovoltaic for IronBug](https://discourse.ladybug.tools/t/possibility-of-developing-solar-collector-flat-plate-photovoltaic-for-ironbug/39554)

<div class="topic-metadata">

**Author:** [@behnammmohseni](https://discourse.ladybug.tools/u/behnammmohseni)\
**Replies:** 4\
**Last updated:** [November 17, 2025, 8:37am UTC](https://discourse.ladybug.tools/t/possibility-of-developing-solar-collector-flat-plate-photovoltaic-for-ironbug/39554 "2025-11-17T08:37:30Z")

</div>

Hey @MingboPeng I hope you are pretty well. Many thanks for adding the Electric Load Center components in IronBug, they’ve been extremely helpful. I was wondering if it might be possible to develop a Flat Plate Photovo…

---

## [Ironbug HVACTemplate\_sys13](https://discourse.ladybug.tools/t/ironbug-hvactemplate-sys13/21629)

<div class="topic-metadata">

**Author:** [@CheneyChen](https://discourse.ladybug.tools/u/CheneyChen)\
**Replies:** 10\
**Last updated:** [November 16, 2025, 7:11pm UTC](https://discourse.ladybug.tools/t/ironbug-hvactemplate-sys13/21629 "2025-11-16T19:11:44Z")

</div>

Manage to test HVAC system 13 RadiantCeiling and DOAS with a single zone model. Always receive the error message as follows. Please help (note the script has been tested working for some template systems, such as sys02 P…

---

## [Humidity control with no HVAC](https://discourse.ladybug.tools/t/humidity-control-with-no-hvac/39563)

<div class="topic-metadata">

**Author:** [@znshn](https://discourse.ladybug.tools/u/znshn)\
**Replies:** 0\
**Last updated:** [November 13, 2025, 4:21pm UTC](https://discourse.ladybug.tools/t/humidity-control-with-no-hvac/39563 "2025-11-13T16:21:16Z")

</div>

Hi there I am looking for a solution to control the humidity levels in rooms without any central ventilation systems. My model only contains a geothermal heat pump with radiator panels and want to use it without air han…

---

## [Are Boiler Efficiencies in EnergyPlus/IronBug Based on LHV or GCV?](https://discourse.ladybug.tools/t/are-boiler-efficiencies-in-energyplus-ironbug-based-on-lhv-or-gcv/39200)

<div class="topic-metadata">

**Author:** [@behnammmohseni](https://discourse.ladybug.tools/u/behnammmohseni)\
**Replies:** 3\
**Last updated:** [September 18, 2025, 9:03am UTC](https://discourse.ladybug.tools/t/are-boiler-efficiencies-in-energyplus-ironbug-based-on-lhv-or-gcv/39200 "2025-09-18T09:03:01Z")

</div>

Hi there, @MingboPeng @chris I hope you are pretty well. In the EnergyPlus Engineering Reference (Boilers section), the definition of boiler efficiency and fuel input does not explicitly state whether the calculation…

---

## [Possible to implement a recirculating ventilation system for grain silos in Ironbug](https://discourse.ladybug.tools/t/possible-to-implement-a-recirculating-ventilation-system-for-grain-silos-in-ironbug/37172)

<div class="topic-metadata">

**Author:** [@Carrier](https://discourse.ladybug.tools/u/Carrier)\
**Replies:** 0\
**Last updated:** [August 15, 2025, 8:50am UTC](https://discourse.ladybug.tools/t/possible-to-implement-a-recirculating-ventilation-system-for-grain-silos-in-ironbug/37172 "2025-08-15T08:50:35Z")

</div>

I aim to model a closed-loop ventilation system for flat grain storage in Ironbug, for subsequent energy analysis with Honeybee. System Principle: Internal Circulation Technology extracts low-temperature air from the c…

---

## [Startup errors: new installation ironbug](https://discourse.ladybug.tools/t/startup-errors-new-installation-ironbug/14062)

<div class="topic-metadata">

**Author:** [@meghanakulhalli](https://discourse.ladybug.tools/u/meghanakulhalli)\
**Replies:** 24\
**Last updated:** [August 5, 2025, 10:39am UTC](https://discourse.ladybug.tools/t/startup-errors-new-installation-ironbug/14062 "2025-08-05T10:39:46Z")

</div>

When I start up grasshopper after installing Ironbug, I have the following errors. I’m new to this so if there’s something I’ve missed, I’d love some help in figuring this out! Object: Ironbug\_SetpointManagerWarmest (l…

---

## [HVAC consumption controller](https://discourse.ladybug.tools/t/hvac-consumption-controller/37081)

<div class="topic-metadata">

**Author:** [@behnammmohseni](https://discourse.ladybug.tools/u/behnammmohseni)\
**Replies:** 3\
**Last updated:** [August 3, 2025, 8:41pm UTC](https://discourse.ladybug.tools/t/hvac-consumption-controller/37081 "2025-08-03T20:41:53Z")

</div>

Hi IronBug users, Do you have any examples that use the scripts (Python/C#) to implement a PID controller (or any other controller except adaptive ON/OFF sensor) for HVAC systems? If so, would it be possible to share? …

---

## [Water-to-water heat pump with Ironbug](https://discourse.ladybug.tools/t/water-to-water-heat-pump-with-ironbug/22234)

<div class="topic-metadata">

**Author:** [@The-Ashok-Majhi](https://discourse.ladybug.tools/u/The-Ashok-Majhi)\
**Replies:** 2\
**Last updated:** [July 31, 2025, 2:51pm UTC](https://discourse.ladybug.tools/t/water-to-water-heat-pump-with-ironbug/22234 "2025-07-31T14:51:50Z")

</div>

Could someone please provide an example file for a river source heat pump using the Ironbug plugin?

---

## [How to obtain the running parameters of the set node](https://discourse.ladybug.tools/t/how-to-obtain-the-running-parameters-of-the-set-node/37080)

<div class="topic-metadata">

**Author:** [@feifeifie](https://discourse.ladybug.tools/u/feifeifie)\
**Replies:** 0\
**Last updated:** [July 28, 2025, 9:24am UTC](https://discourse.ladybug.tools/t/how-to-obtain-the-running-parameters-of-the-set-node/37080 "2025-07-28T09:24:02Z")

</div>

Hi, all. I want to get the operating parameters of a cooling coil. I first tried to place a node, but the branch does not support placement. How can I get the flow rate or outlet water temperature of this node? Have any…

---

## [Placing Probe Elements on Demand Side Nodes](https://discourse.ladybug.tools/t/placing-probe-elements-on-demand-side-nodes/23282)

<div class="topic-metadata">

**Author:** [@Elliot\_Glassman](https://discourse.ladybug.tools/u/Elliot_Glassman)\
**Replies:** 1\
**Last updated:** [July 28, 2025, 8:53am UTC](https://discourse.ladybug.tools/t/placing-probe-elements-on-demand-side-nodes/23282 "2025-07-28T08:53:01Z")

</div>

Have gotten in the habit of using Probes to help with my model troubleshooting. Unfortunately, I am having some issues with overheating and underheating on a couple models with VAV terminals with reheat, and to better un…

---

## [How to control 3 chillder operation scheme for load ratio using ironbug?](https://discourse.ladybug.tools/t/how-to-control-3-chillder-operation-scheme-for-load-ratio-using-ironbug/24246)

<div class="topic-metadata">

**Author:** [@minggangyin](https://discourse.ladybug.tools/u/minggangyin)\
**Replies:** 3\
**Last updated:** [July 8, 2025, 12:52pm UTC](https://discourse.ladybug.tools/t/how-to-control-3-chillder-operation-scheme-for-load-ratio-using-ironbug/24246 "2025-07-08T12:52:25Z")

</div>

This project has 3 same capacity chiller. The operation scheme is: 0-33% total load ,chiller 1 on. 33%-66% total load chiller 1 and 2 on. 66%-100% total load chiler 1\\2\\3 on. I tried to use IB\_PlantEquipmentOperationCo…

---

## [Ironbug pump frequency conversion control](https://discourse.ladybug.tools/t/ironbug-pump-frequency-conversion-control/36956)

<div class="topic-metadata">

**Author:** [@feifeifie](https://discourse.ladybug.tools/u/feifeifie)\
**Replies:** 0\
**Last updated:** [July 8, 2025, 3:29am UTC](https://discourse.ladybug.tools/t/ironbug-pump-frequency-conversion-control/36956 "2025-07-08T03:29:15Z")

</div>

Has anyone tried to control the pump frequency based on the supply and return water temperature difference or pressure difference? I checked the help document of energyplus to simulate a more realistic HVAC system con…

---

## [Ironbug How to place multiple coils in one room？](https://discourse.ladybug.tools/t/ironbug-how-to-place-multiple-coils-in-one-room/36910)

<div class="topic-metadata">

**Author:** [@feifeifie](https://discourse.ladybug.tools/u/feifeifie)\
**Replies:** 2\
**Last updated:** [July 7, 2025, 1:34am UTC](https://discourse.ladybug.tools/t/ironbug-how-to-place-multiple-coils-in-one-room/36910 "2025-07-07T01:34:43Z")

</div>

In actual projects, a large space will not have only one coil placed in it, as this will make the model too large. Usually multiple fan coils will be placed in this area. However, when setting up the HVAC system in Ironb…

[Next page](https://discourse.ladybug.tools/c/grasshopper/ironbug/35.md?page=1)