Irradiance map

[czpixel]

I need to be sure that I am getting the proper results please. Please find a screenshot attached. This is the energyyearroof.tif meaning a raster of irradiance on ground and building roofs named Energyyearroof.tif. This should be a geoTIFF (Energyyearroof.tif) showing pixel wise total irradiance in kWh. Can I say that this is the irradiance map? I would need to filter out anything below 900kwh. Thanks for your help :)

[biglimp]

Your values look abit high. Please attach your meteorological file.

[biglimp]

My runs (1 year and 5 year) just finished. They show reasonable results, hence the model simulates multiple years correct. It is always better to run multiple years

[czpixel]

Would you mind attaching the results? (even a screenshot).

I want to be sure that it is like mine please. Did you get same low values please?

[czpixel]

How would you interpret this (above screenshot) please? The maximum is 243 kwh per year?

[biglimp]

These are wrong. Have you ticked in ”estimate direct and diffuse radiation from global”? Have you set the UTC (+1) correct?

[biglimp]

This is what I got running with 5 years of data:

[czpixel]

Thanks for your email. I have attached the requested files online (too large via email)! Do you think there is something wrong with the weather data? Thanks for your help. Regards, Charmaine

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On Fri, Mar 19, 2021 at 8:08 AM biglimp ***@***.***> wrote: Your values look abit high. Please attach your meteorological file. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#253 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATJK55ACN2MTWNQDFPE2VULTELZ6FANCNFSM4ZND7Z5Q> .

[GLauretti]

Hello everybody,
I would like to join the discussion because I am having the same problem.
I'm working on a solar cadaster about my University in Rome.
In Rome, the amount of solar radiation in 1 year is near 1600 kWh/m2 but the results from my SEBE analysis is than lower (1200, considering that the buildings are completely isolated all around from the rest of the city) when I count the energy on the roofs (without considering the slope), and much higher when I take the slope in account ('till 2200).
I took the data from my university meteorological station.
I thank you in advance for any advices.
Regards
Giulia Lauretti

[biglimp]

Could you attach you data (meteorological file and DSM) so that I can have a look.

[GLauretti]

This is one of the area of interest that I am studying.
Thank you for the fast support.
Dataset:
dati_completi_2017.txt
DSM file:
Rome_university_DSM.zip

[biglimp]

Your time resolution is three hour but SEBE only works with hourly data. That is probably the why you see low irradiance values. The reason of using hourly resolution is distribute the incoming radiation more evenly on the sky vault.

[biglimp]

Ok, now I saw your answer in github. Lets continue discussion there. Fredrik 23 mars 2021 kl. 17:13 skrev czpixel ***@***.***>:  How would you interpret this (above screenshot) please? The maximum is 243 kwh per year? — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#253 (reply in thread)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AC23KBAXZAZHST475TLSITTTFC42RANCNFSM4ZND7Z5Q>.

[czpixel]

Thanks for your reply. When I run the tool, I get two .tif files. Which one should I use? Is it the energyearroof.tif or dsm.tif ?

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On Wed, Mar 24, 2021 at 9:20 AM biglimp ***@***.***> wrote: This is what I got running with 5 years of data: [image: image] <https://user-images.githubusercontent.com/11908356/112277511-20de2a80-8c82-11eb-869c-f7ef901a5b4b.png> — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#253 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATJK55HQ5RAXJJFOIYDKB7TTFGOFTANCNFSM4ZND7Z5Q> .

[biglimp]

energyearroof.tif

[czpixel]

Thank you so much!!! :) :) :) :) I didn't tick estimate direct and diffuse radiation from global, so that is why I was getting the wrong values. I have some final questions to ask you if that is OK. - I left albedo as 0.15 - UTC 1 - when analysing the height (to produce height raster) using urban geometry (UMEP tool), what is the wall limit that I should set please? - In addition, when preparing the weather file, the incoming shortwave radiation is also known as Top-Of-Atmosphere Shortwave Downward Irradiance (W/m^2) or All Sky Surface Shortwave Downward Irradiance (W/m^2) please or Clear Sky Surface Shortwave Downward Irradiance (W/m^2) ? - the values that I obtain from ernegyearroof.tif are kwh per year only or per year per m2 ? Thank you very much, I really appreciate your help!

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On Wed, Mar 24, 2021 at 1:22 PM biglimp ***@***.***> wrote: energyearroof.tif — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#253 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATJK55BBX32OXAGCL26HF6TTFHKR5ANCNFSM4ZND7Z5Q> .

[biglimp]

• Albedo, ok
• I suspect that you have used a Lidar dataset to produce your dsm, hence your walls are somewhat unclear. Thus, maybe use a lower threshold like 2 meters. This only affects the wall irradiance and not energyyearroof.tif
• All Sky Downward Irradience, i.e., radiation at the Earth surface.
• Per year per m2

[czpixel]

Thank you!! Very helpful :)

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On Thu, Mar 25, 2021 at 8:13 AM biglimp ***@***.***> wrote: - Albedo, ok - I suspect that you have used a Lidar dataset to produce your dsm, hence your walls are somewhat unclear. Thus, maybe use a lower threshold like 2 meters. This only affects the wall irradiance and not energyyearroof.tif - All Sky Downward Irradience, i.e., radiation at the Earth surface. - Per year per m2 — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#253 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATJK55AIISSADJVLGZ755WDTFLPCNANCNFSM4ZND7Z5Q> .