GenCumulativeSky problems

Hello Mostapha,

when working with the component Ladybug_GenCumulativeSky I get a null result and the report “epwWeatherFile address is not a valid .epw file” I downloaded the epw file from the Energy Plus website. There are some known issues about this?

I have downloaded the GenCumulativeSky.exe file manually. It has to be placed in the workingDir or can stay anywhere? The workingDir should contain all or some of the project files?

Thank you.

Francesco

Hi Francesco,

Apparently, for some reason the component cannot find the epw file. Are you sure that you are referring to the right address? The address should be to the file and not to the directory.

Cheers,

Mostapha

Hello Mostapha,

thank you. Actually I did to write the right address and file name. Anyway now it worked, could be that before there were not in the same directory of the .epw file also the other files, the .ddy .stat and .txt that comes together when you download it?

I have one general question: so to perform solar radiation analysis with LadyBug is necessary the weather file .epw, right? This is quite a limitation because for many minor locations it doesn’t exist. If I understand correctly this will be not a problem anymore with Honeybee right? (because it uses EnergyPlus I understood, like Diva). When you think you will release Honeybee? Thank you for the work you are doing.

Best regards.

Francesco

Hi Francesco!

Good to know that it works now. You don’t need to download .ddy and .stat files for GenCumulativeSky. The folder also shouldn’t cause any problem since the component checks and downloads GenCumulativeSky to workingDir in case it is not already there.

I agree that it is hard to find .epw file (EnergyPlus Weather file) for many locations. There are websites that you can purchase the weather files for many locations and there are software that generate the data. They may be open to share the data for free for educational purposes.

Nevertheless EnergyPlus and Radiance or any interface such as DIVA, OpenStudio, etc on top of these engines need some sort of data to calculate the sky condition and the radiation. Honeybee won’t be any different!

I’m so bad in predicting the release time so let me not to do that! :slight_smile: The only thing that I can say is I’m doing my best to release a test version as soon as possible. I’ve already solved almost all the technical issues but the workflow is not solid enough for a public release. Thank you for your interest and your patient. :slight_smile:

Best,

Mostapha

Hello Mostapha,

ok then probably was some other reason the previous issue.

Don’t worry no need to make predictions for the Honeybee release, it was just to have an idea :slight_smile: So with Honeybee the installer will set EnergyPlus and Radiance as well? (Like DIVA) About use the epw files the interesting thing is that you can work out analysis in realtime, that’s very good.

I appreciate a lot the the LadyBug’s direct sunlight hour calculation component. It is the first, at least in my experience, between the different environmantal analysis tools for GH that does this straight and easily. So far I used to calculate with with a whole definition I built.

About websites for epw files I usually visit this http://apps1.eere.energy.gov/buildings/energyplus/weatherdata_about…

there are others? What tool you suggest to create weather files? Even if I imagine they should not bee very easy to use. I mean this more for the teaching aspect than for the research one.

Thanks for your work.

Best

Francesco

Hi Francesco,

Sorry to get back to you late!

Back to Energyplus and Radiance I’ll probably ask users to download and install them manually. I really like the idea to let the users know what is really happening in the background. I believe the more you know about the workflow the smarter you’ll use the tool.

Thank you for the comment. If you are extensively using the analysis components let me know and I’ll send you a newer version for test which is much faster.

There are other resources that you can use. Weather Analytics is one of the options http://www.weatheranalytics.com/weather-products/ and White Box Technologies http://www.whiteboxtechnologies.com/weather_data.html is another one. I know that in some cases they provide it for free for educational use.

Best,

Mostapha

Excuse me.I just study ladybug.And I can’t downloaded the GenCumulativeSky.exe.So where did you get it?Could you send me the soft to my E-mail addressed zsbill@yeah.net?Thank you.

Hi Bill, Here is the file: http://dl.dropbox.com/u/16228160/GenCumulativeSky/GenCumulativeSky.exe