Green Facade Thermal Benefits


#1

I am a student learning Grasshopper and Honeybee.
For my Thesis Project I am trying to quantify the Thermal Benefits of Green Facades.
Can someone please tell me how to make a Vertical Green Facade on Honeybee, so that I can simulate the cooling load reduction with Green Facade?
Is it possible to measure reduced cooling load by both shading and evapotranspiration?

Looking forward to your responses!


#2

@Jameela ,
This example file show how to add a green roof to you Honeybee energy model:
http://hydrashare.github.io/hydra/viewer?owner=chriswmackey&fork=hydra_2&id=Green_Roof_In_Energy_Model&slide=0&scale=1&offset=0,0

You can use it to get an estimate of the benefits of a vertical green facade but you should read the E+ documentation on the roof vegetation object to understand its limitations since it says that the model isn’t really intended to model vertical facades:
https://bigladdersoftware.com/epx/docs/8-9/input-output-reference/group-surface-construction-elements.html#materialroofvegetation


#3

Hey Chris.
Thanks for the response. I looked at the File you sent me, and I am getting an error when I tried to read the results. Can you please tell me what this error is for?
I am uploading a picture of the error message.

‘1. Solution exception:C:\Git\OS\openstudiocore\src\model\PlanarSurface.cpp@644 : Cannot create a surface with vertices [[0, 0, 0.003], [0, 0, 0], [0.01, 0, 0], [0.01, 0, 0.003]]’


#4

@chris

I also found a study regarding simulations of Green Facades in Energy Plus. A model for Green Facades was created for the study. This is the link of the study:

These are some of the properties for the Green Facade Model that were mentioned in the study:
image

Is it possible to change the characteristics of the Material Input in EP Construction to modify it for Green Facades? if so, should the values be modified in the Panel connected to the EP Construction or in the Energy Plus Library?

PS: I have watched all your tutorials on Energy Modelling with Honeybee and found them a great way to learn, thanks a lot for the detailed explanations!


#5

I think the subject is far more complex than you think.
Plants cannot be modeled as simple objects. They indeed have influence on hygrothermal confort, but the building it self has influence on the plant behaviour.
Three suggestions to go further:
1 - read “microclimate, plants and fauna” writen by stoodjestike and barkman
2 - look for the thesis of Christian Kongsgaard, and his livestock component (on this forum and his personal website).
3 - Let keep in touch. I’m façade engineer for ten years now, and this thema is my subject of research as well.


#6

With regards to your error, make sure that your Rhino model is in meters.


#7

Oh yes ofcourse, my mistake.
Thank You!


#8

@FrehelDenis
Thanks for your response!
I am studying Facade Engineering too, and this topic is very interesting for me.

You are right, I do realise the complexity of the subject.

I looked at the Livestock Component that you mentioned. It sure looks like a very useful tool, however I am a beginner with Grasshopper, and haven’t used much of Python. Do you think it would be advisable for me to use this component as a newbie?

I am trying to arrive at an approximate value for my present study, so could you suggest which would be the best way to achieve this goal?