Time Series and TMY data

Why are meteo data for selected months in TMY file different from meteo data for corresponding months in time series dataset?

Modified on: Mon, 30 Jan, 2017 at 11:21

When generating TMY data, we try to select months in such a way that annual sum of GHI/DNI values in the TMY file is consistent with the annual average calculated from time series. However, it may not be possible to find representative months where the sum of irradiation as well as meteo values will equal the long-term average. Therefore, we may be required to slightly adjust the meteo values to maintain similar averages as calculated from time series.

More information on how Solargis TMY data is prepared can be seen here: http://solargis.com/assets/publication/2014/Cebecauer-Suri--SolarPACES2014--Improved-method-for-generating-Typical-Meteorological-Year-data-for-solar-energy-simulations--presentation.pdf

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