awills

Hi, For thermal loss factors at this point: According to their own measurements, some users proposed, when using standard meteo values such those in the US TMY2 data (usually around 4-5 m/sec on an average in continental - not-coast places), the following U-values: Uc = 25 W/m²·k, Uv = 1.2 W/m²·k / m/s How are these values calculated? Does PV Syst recommend a way this can be calculated?

Thanks Andre. Hi, For thermal loss factors at this point: According to their own measurements, some users proposed, when using standard meteo values such those in the US TMY2 data (usually around 4-5 m/sec on an average in continental - not-coast places), the following U-values: Uc = 25 W/m²·k, Uv = 1.2 W/m²·k / m/s How are these values calculated? Does PV Syst recommend a way this can be calculated?

How does one easily Merge or combine meteo data files? I want to combine Meteonorm with SolarGIS with equal weighting.