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!

Antonietta

Hi @anto.ac,

  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:
https://www.nuaire.co.uk/residential/heat-recovery-mvhr/mrxboxab-eco-lp2

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?

Thanks,
Antonietta

@anto.ac I probably would model a DOAS-ish system without heating and cooling coils, this has been suggested on Unmet: https://unmethours.com/question/12726/mechanical-ventilation-with-heat-recovery/

I quickly created an example file with MVHR system with 80% heat recovery.
Simple Model for MVHR test.gh (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?

@anto.ac it looks like you didn’t install the newest version.
Did you try to installed from https://github.com/MingboPeng/Ironbug/releases ?

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,
Antonietta

Energy model_SIMPLE.gh (1.1 MB)

Hi @anto.ac
You just need to put the customized HVAC system to “ExportOpenStudio”:

You can also check same ironbug examples for general workflows on https://hydrashare.github.io/hydra/