Page 8 - Penn State Mechanical Engineering Magazine 2020

Faculty Profiles
Advancing clean energy
Linxiao Zhu joined the Penn State College of Engineering’s Department of Mechanical Engineering (ME) as an assistant professor and the John J. and Jean M. Brennan Clean Energy Early Career Professor in August.
Powering the world in a safer, more efficient way is the springboard for all of Zhu’s research. Specifically,
his work will explore how the fundamental properties of heat and light can be understood and controlled by using novel nanostructures and materials, with the ultimate goal of improving the efficiency of current energy devices and developing novel sources of clean energy.
“These ideas are going to be even more critical in the coming years, in order to lower the impact on our environment,” Zhu said. “If people can use energy more efficiently or utilize clean energy sources, that will become important in everyday life.”
While he plans to explore several areas in pursuit of this goal, including exploring new ways to harvest energy from heat, sunlight and a nonconventional resource—the sky, one particular focus has already led to the development of a laser-free solid-state refrigeration system that uses light to actively cool other devices.
“Currently, the traditional way to achieve air conditioning or refrigeration is to use vapor compression systems,” Zhu said. “The efficiencies of those systems are high, but there are still many ways they can be improved.”
For instance, air conditioning units are bulky and generate noise through their various components.
“For my research, I’m interested in developing a new generation of these systems, and instead of using fluids or chemicals, it would be a solid state with no moving components and a small footprint,” he said.
He was able to achieve this by applying a reverse voltage bias to a commercial infrared light emitting diode to cool other devices, which Zhu says was the first experimental realization in the field. Further exploration of more powerful and space-saving cooling systems like this could enable many new applications, such as in aerospace technology or wearable devices.
Zhu’s professorship, made possible by the generous support of John and Jean Brennan, was awarded in recognition of his previous accomplishments and future potential in the field. The professorship was created to support an outstanding faculty member whose research is focused on clean energy that will help eliminate the world’s dependence on fossil fuels. As he begins his career at Penn State, he hopes he can make an impact in both teaching and research and leverage both the University’s Materials Research Institute and computing resources.
“Penn State has an excellent program in both research and education,” he said. “I’m excited about opportunities for strong collaborations in the ME department and across the University.”
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