The data collection system receives and stores all the information generated by the temperature differential controller (RESOL, DeltaSOL ES in multiple collector orientation with multiple heat delivery points operation mode) that in turn receives this information from the temperature probes and the flow meter on the totalizing line.

This information is available and can be downloaded locally, through ports and standard communications protocols, but also remotely, via a remote communication system (GSM modem), after connection to a Data logger (RESOL DL1), which can transmit via GSM through a SIEMENS TC35i modem connected to a YAGI ASPJ 810 antenna. The data download is done by using the data logger’s specific software: RESOL Service Centre.

The data downloaded from the data logger which is important in the course of the monitoring consists in:

• 4 Temperature columns [°C]: in the feeding line leading to the collectors (cold probe), West collectors, East Collectors and Totalizing line;

• Flow [m3/h];

• Pumps operating mode [%] (always 0 or 100% for each side of the installation);

• System time;

• Amount of collected energy (cumulative) [Wh].

Every month the data downloaded is analyzed based on the following aspects and visualizations:

• Month period simple statistical analysis of the temperature probes (maximum, minimum, average and daytime average);

• Monthly radiation incident in the collectors compared with (instantaneous) extracted energy

• Monthly period temperature profile of the installation;

• Monthly plot of the extracted energy versus total incident radiation;

• Flow (monthly plot).