Round Robin Test of Absorptance and Emittance of Particles for CSP




Particles, Absorptance, Emittance, Round Robin Test


Precise knowledge of particle optical properties is crucial to the advancement and success of directly-irradiated particle receiver technologies. This work presents the results of a Round Robin Test (RRT) that was conducted between seven laboratories, where each participant measured the absorptance and emittance for a set of five different particle types. This research was performed within the framework of the SolarPACES Task III group, and the results helped establish a guideline for evaluating the optical properties of particles. The guideline was published on the SolarPACES Task III website in May 2022.


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SolarPACES Guideline “Method to evaluate the reflectance, absorptance and emittance of particles for concentrating solar power technology” Version 1, May 2022.Available online:

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How to Cite

Sutter, F., Montecchi, M., Morales Sabio, A., San Vicente, G., Fernández-García, A., Pernpeintner, J., … Ho, C. K. (2024). Round Robin Test of Absorptance and Emittance of Particles for CSP. SolarPACES Conference Proceedings, 1.

Conference Proceedings Volume


Measurement Systems, Devices, and Procedures

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