Model Mechanical Ventilation with Heat Recovery (MVHR) and room zones in residential flat

Hi there,

I am building an energy model of a residential flat in GH + HB and I am currently stuck on 2 points:

  1. How can I model a Mechanical Ventilation with Heat Recovery (MVHR) system?
    Basically I want a fix air flow at outdoor air temperature entering the room with a % heat recovery.

  2. How do I assign specific zones to different rooms, e.g. kitchen, bedroom, etc.? I can only see ‘apartment’ in the Honeybee_ListZonePrograms.

Any help would be very much appreciated.

Thank you!



  1. Are you talking about DOAS system with heat recovery? or DOAS without heating and cooling components?
  2. You can use small or large hotel as a reference for internal loads and schedules, and you can always override any settings by using your own values.

Hi Mingbo,

Thanks for this. I will use the hotel zones as a basis and then adjust the schedules and loads :wink:
Regarding the ventilation system, I don’t think the DOAS is what I am after. Basically the unit I would like to model does not have any heating or cooling coil, it’s just a fix volume fan-assisted system with heat recovery between supply and extract air flow. Something like this:

I have used the natural ventilaiton component, assigned fan-assisted natural ventilation, but then I cannot specify the heat recovery… is there something I can do about this?

Antonietta I probably would model a DOAS-ish system without heating and cooling coils, this has been suggested on Unmet:

I quickly created an example file with MVHR system with 80% heat recovery.
Simple Model for MVHR (557.7 KB)

Please let me know if this makes sense to you.

Hi Mingbo,
That’s great, thank you! I have installed Ironbug but my components look different from yours and some disappear when I open your file. What am I doing wrong? How can I fix it, please? it looks like you didn’t install the newest version.
Did you try to installed from ?

I had installed the wrong version indeed. Thanks a lot!

Hi Mingbo,

I have added your MVHR component but it doesn’t seem to work properly. Would you be able to have a look at my model, please?

Thanks a lot,

Energy (1.1 MB)

You just need to put the customized HVAC system to “ExportOpenStudio”:

You can also check same ironbug examples for general workflows on