UC San Diego Professor Creating CSP Tool That’s ‘Not Your Typical Infrared Camera’

Through a grant from the U.S. Department of Energy (DOE), a professor at the University of California San Diego is developing a diagnostic tool that can rapidly measure and monitor heat transfer in concentrating solar power (CSP) plant materials, such as the tubing and the heat transfer fluids and solid particles flowing through the tubing materials.

Renkun Chen, a professor of mechanical and aerospace engineering at the University of California San Diego, recently received a $1.18 million award from the DOE’s Solar Energy Technologies Office to develop technology to advance next-generation CSP systems.

According to the university, the tool being developed by Chen could provide a convenient and inexpensive way to evaluate the performance of CSP plant materials, as well as do continuous, real-time monitoring to assess the health of these materials over decades of use.

“There’s a series of complex heat transfer processes happening across different materials, from the outer solar absorber coating, to the pipes and to the heat transfer fluids or particles. To develop a CSP plant, you need to have a good understanding of the thermophysical properties of these materials – for example, how fast they conduct heat and how well they store heat,” explains Chen. “However, these properties aren’t well understood at high operating temperatures, which will exceed 700 C in next-generation CSP technologies that the Energy Department is envisioning. Our proposed characterization tool will contribute to this effort.”

The tool that Chen and his team are developing is essentially an ultra-sensitive infrared camera that can remotely measure the thermophysical properties of CSP plant materials at temperatures above 700 degrees C. The camera would be sensitive enough to measure temperature changes much smaller than 1 degree C.

“This would not be your typical infrared camera,” notes Chen. “Existing off-the-shelf ones can’t measure temperature changes smaller than a few degrees Celsius”

Currently, the methods to measure high-temperature thermophysical properties of CSP plant materials are costly and labor-intensive, according to UC San Diego. As next-generation CSP systems are pushing for higher temperature with emerging materials, such as molten salts and solid particles, rapid and accurate measurements of their thermophysical properties are becoming more imperative, explains Chen. Additionally, current on-site monitoring of heat transfer processes in CSP plants requires implanting temperature sensors at different spots inside the materials. And these sensors would need to withstand the extreme conditions inside, notes Chen.

In this project, Chen is leading efforts to develop a non-contact tool that can be applied remotely for in situ diagnostics in CSP plants and can provide rapid measurements in the laboratory. This tool would be inexpensive and convenient to use compared to existing diagnostic methods for CSP plant materials, says UC San Diego.

Chen is a faculty member of the Department of Mechanical and Aerospace Engineering and is affiliated with the Center for Energy Research and the Sustainable Power and Energy Center, all at UC San Diego. The project is entitled “Non-Contact Thermophysical Characterization of Solids and Fluids for Concentrating Solar Power.” Co-investigators include Professor Perry Li at the University of Arizona.

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