Hossam Posted February 27 Share Posted February 27 The meteonorm 8.1 database has hourly values of ambient temperature. Does PVsyst calculate the Cell temperature using the ambient temperature value at the specific time during the simulation or it uses the monthly average for all days? I mean does it calculate the cell temperature only during daylight or it merges all heat transfer throughout the year, day and night. Link to comment Share on other sites More sharing options...
Michele Oliosi Posted March 24 Share Posted March 24 Dear Hossam, the cell temperature is calculated with the ambient temperature at each specific hour. Link to comment Share on other sites More sharing options...
Hossam Posted Tuesday at 02:41 PM Author Share Posted Tuesday at 02:41 PM Does it include the ambient temperatures at night in the simulation of thermal losses? Link to comment Share on other sites More sharing options...
Michele Oliosi Posted Tuesday at 03:58 PM Share Posted Tuesday at 03:58 PM By thermal losses we only account the losses due to the loss of efficiency when the module heats up during the day. Unless you are concerned with infinitesimal variations of temperature, since the thermal inertia of modules is about 10 minutes, you don't need to merge the heat transfer throughout the year, day and night to simulate in hourly steps. Considering the heat transfer within the hour is enough. Link to comment Share on other sites More sharing options...
Hossam Posted Thursday at 12:49 PM Author Share Posted Thursday at 12:49 PM This means the losses are only calculated using the hourly temperature values only in the presence of irradiance or throught the day (24 hours)? Link to comment Share on other sites More sharing options...
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