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Error using EPW weather file downloaded from EnergyPlus
22 Jul 2020 22:18 #8478
by pgilman
Replied by pgilman on topic Error using EPW weather file downloaded from EnergyPlus
Hi Ali,
Those error messages indicate that there is a problem with the direct normal irradiance (DNI, or beam irradiance) data for a few of the 8760 hours in the weather file. It looks like one value is 1,910 W/m2, which is higher than you would expect, and there are several hours with negative DNI values. For example, you can see in this plot (click View data on the Location and Resource page) that there are some negative DNI values on April 25:
You could ignore those errors because the only affect a few hours of the year, or you could try a weather file from a different source like the PVGIS source listed here: sam.nrel.gov/weather-data.
Best regards,
Paul.
Those error messages indicate that there is a problem with the direct normal irradiance (DNI, or beam irradiance) data for a few of the 8760 hours in the weather file. It looks like one value is 1,910 W/m2, which is higher than you would expect, and there are several hours with negative DNI values. For example, you can see in this plot (click View data on the Location and Resource page) that there are some negative DNI values on April 25:
You could ignore those errors because the only affect a few hours of the year, or you could try a weather file from a different source like the PVGIS source listed here: sam.nrel.gov/weather-data.
Best regards,
Paul.
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