Measured data from a solar parabolic trough collector field

A setup consisting of two parabolic trough collectors is installed at the Solar & other Energy Systems Laboratory of the National Center for Scientific Research "Demokritos". The installation is located at Agia Paraskevi, Athens, Greece (Latitude 37 deg 59'57'' N, Longitude 23 deg 49'07'' E). The collectors have a length of 19.79 m and a width of 2.37 m. The net collecting surface of each collector is 41 m².  The heat transfer fluid (HTF) is TherminolSP. The collectors have a south orientation and are equipped with a one-axis tracker that rotates about a horizontal east–west axis. Several sensors were installed to measure temperatures, flow rate, and solar irradiance, with the corresponding data presented in this spreadsheet. PT100 sensors are used to measure the HTF temperature at various points, a coriolis flow meter is used to measure the flow rate, and a pyrheliometer is employed to measure the DNI. Measurements from 3 different dates (July 2025) are presented with a time step of 1 minute.