Pernpeintner, J.J.PernpeintnerSchiricke, B.B.SchirickeSallaberry, F.F.SallaberryJalon, A.G. deA.G. deJalonLópez-Martín, R.R.López-MartínValenzuela, L.L.ValenzuelaLuca, A. deA. deLucaGeorg, AndreasAndreasGeorg2022-03-132022-03-132017https://publica.fraunhofer.de/handle/publica/39737610.1063/1.49843372-s2.0-85023624670A round robin for parabolic trough receiver heat loss and optical efficiency in the laboratory was performed between five institutions using five receivers in 2015/2016. Heat loss testing was performed at three cartridge heater test benches and one Joule heating test bench in the temperature range between 100 °C and 550 °C. Optical efficiency testing was performed with two spectrometric test bench and one calorimetric test bench. Heat loss testing results showed standard deviations at the order of 6% to 12 % for most temperatures and receivers and a standard deviation of 17 % for one receiver at 100 °C. Optical efficiency is presented normalized for laboratories showing standard deviations of 0.3 % to 1.3 % depending on the receiver.enSolarthermie und OptikSolarthermieThermische Kollektoren und Komponententrough receiverlossrobin621697conference paper