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RWTH-EBC / BESMod

A Modelica library providing building energy system modules
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WeatherData HOM #73

Open larissakuehn opened 6 months ago

larissakuehn commented 6 months ago

These two models are used to calculate the radiation on the tilled surfaces of the HOM, based on data from the weather data reader (IBPSA.BoundaryConditions.WeatherData.ReaderTMY3):

The first model includes a time shift for TMY instead of TRY data, which is not required with the updated version of the weather data converter, right?

In the latter model the irradiation on tilled surface is calculated on basis of the direct and diffuse irradiation on the horizontal surface. As the direct irradiation on a horizontal surface is not included in the weather data reader it is calculated from data. The models distinguishes between TRY and TMY data as an option. Currently in both cases the irradiance input for HDirHor is calculated by the following equation: Input_HDirHor = HGloHor - HDiffHor Unfurtunarly currently for further calculations the model now uses the following equation for TRY data, which is correct: HDirHor = Input_HDirHor but the following equation for TMY data: HDirHor = Input_HDirHor * cos_tilled_z The model assumes the input for TMY data to be HDirNor.

As we only want to use the TMY format in combination with the TMY3 weather data reader my suggestion is to delete the second option for TRY data and to use HDirNor as an input. This would be equivalent to the irradiance input for direct irradiance in the ROM models. For the first model, I would then delete the time shift and directly use the data.

github-actions[bot] commented 6 months ago

Branch issue-73-WeatherData_HOM created!