Is it possible to calculate PET value to evaluate Outdoor thermal comfort condition?

Hi all, i'm tryng to calculate PET value with Ladybug about outdoor thermal comfort study.

I am using for my thesis from which revenue Envimet some benchmarks including MRT and then through Rayman get the PET PMV SET index values. Unfortunately I can not (sorry I'm still in the early experiences with LB + HB) to calculate the PET with LB (maybe checking the result with that obtained by Rayman), my goal (idea) would be to write a component (or cluster) that allows me to determine the PET through the input of values as (potential temperature, wind speed, relative humidity, MRT)and view all within my 3D model.

Thank you in advance.

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Permalink Reply by Jason on July 2, 2015 at 8:27pm

Hi Chris,

Many thanks! That is exactly what I need.

Best,

Jason

Permalink Reply by djordje on December 29, 2015 at 7:21pm

Hi all, i'm tryng to calculate PET value with Ladybug about outdoor thermal comfort study.

Hi Luciano. PET outdoor comfort index has been added to the "Thermal Comfort Indices" a couple of weeks ago. To get it, just download the Ladybug_Thermal Comfort Indices.ghuser file from here (click on "View raw" to download it) and put it in your Grasshopper user objects folder: File -> Special Folders -> User Object Folder.

I've heard about RayMan model (This research paper) but I didn't realize that it's an actual software. So, upon your response, I searched up the software, and I tried to download it, but there was a problem with their website. To be able to download it I have to fill a short form, I did so but the form won't submit, I think the submit button doesn't work.
http://link.springer.com/article/10.1007/s00484-006-0061-8

Hi Rania. You may have solved this issue, just in case somebody experiences the same problem: The latest version of Rayman can be downloaded from here:
http://www.urbanclimate.net/rayman/rayman.htm

Thermal Comfort Indices component is using the same fortran code to calculate PET, which Rayman is using.

The MRT of the "Thermal Comfort Indices" is good for calculating a general MRT in sunny conditions. If you want something that more specifically accounts for human geometry, you can use the "Outdoor Solar Temperature Adjustor" component.

The new version of Sunpath shading component has an output "shadedSolarRadiationPerHour", which when added to Thermal Comfort Indices' "globalHorizontalRadiation_" input, adjusts the mean radiant temperature for the impact of shading.
Also a new "meanRadiantTemperature_" input has been added so it is now possible to use Outdoor Solar Adjusted Temperature Calculator component's "solarAdjustedMRT" as an input as well.

Thank you Chris for pointing me to this topic. I missed it somehow.

Permalink Reply by Luciano on December 29, 2015 at 7:54pm

It's a really good news! Thank you so much. In these days i'm working on that fortran code..but you were much quicker than me :).Thank you for all your advice.

Merry Christmas and happy New Year