Interpretation of annual radiation data directly from the result files

tobiaspedersentsp · October 3, 2018, 1:30pm

Hi !

I’m running a large number of annual radation studies using HB+. To save time I’m writing all of the batch files first, running them in parallel and then performing data analysis outside grasshopper.

The result files (“diffuse…scene…default.ill” + “sun…scene…default.ill” = “scene…default.ill” ) contains data that is different from when you load the same result files into grasshopper using “HoneybeePlus_Hourly Values”. Have tried going through the code looking for a formatting of the data from the results files when it is loaded into grasshopper, with no luck,

Interestingly when performing DC gridbased illuminance simulations in HB+ the content of the result files matches the output of “HoneybeePlus_Hourly Values” when you load it into grasshopper.

So in a nutshell I am trying to understand the unit of the data in the result files from an HB+ annual radation study and how to convert it to kWh or Wh.

I bet @mostapha has a take on this

Cheers Tobias

mostapha · October 6, 2018, 8:28pm

My best guess is that you forget to divide the values by 179.

github.com

ladybug-tools/honeybee/blob/7c8be0e5970504a17c2c175e8238ad5334f2436a/honeybee/radiance/recipe/daylightcoeff/gridbased.py#L368


    ag.unload()


# results are merged as a single file
for rf in self._result_files:
    fn = os.path.split(rf)[-1][:-4].split("..")
    source = fn[-2]
    state = fn[-1]


    folder, name = os.path.split(rf)
    df = os.path.join(folder, 'sun..%s' % name)
    mode = 179 if self.simulation_type == 1 else 0
    start_line = 0
    for count, analysisGrid in enumerate(self.analysis_grids):
        if count:
            start_line += len(self.analysis_grids[count - 1])


        if not os.path.exists(df):
            print('\nloading the results for {} AnalysisGrid form {}::{}\n{}\n'
                  .format(analysisGrid.name, source, state, rf))
            # total value only
            analysisGrid.set_values_from_file(

and here is why 179:

tobiaspedersentsp · October 10, 2018, 2:43pm

And you are correct - thank you very much !