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15 June 2023 Nighttime >100mW/m2 power generation using radiative cooling
Zunaid Omair, Sid Assawaworrarit, Lingling Fan, Weiliang Jin, Shanhui Fan
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Proceedings Volume 12513, Energy Harvesting and Storage: Materials, Devices, and Applications XIII; 125130A (2023) https://doi.org/10.1117/12.2667184
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States
Abstract
The temperature difference between the earth (288K) and outer space (3K) can operate a heat engine and generate electricity. We can use an optical emitter to radiate strongly within the atmospheric transparency window (8-13µm) and cool the emitter below the ambient temperature. A thermoelectric generator can then harness the temperature difference between the emitter and ambient to generate electricity. However, parasitic conduction between air and the optical emitter, inefficient thermal contacts, and thermal conduction through the thermoelectric itself severely penalize the maximum electrical power generated. We minimize these three penalty terms by careful engineering while increasing the outgoing optical radiation and experimentally demonstrating a record >100mW/m2 for this technology. We can use this efficient, simple, and cheap electricity generation method to deliver power in remote places and the most efficient ambient energy harvesting scheme.
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Zunaid Omair, Sid Assawaworrarit, Lingling Fan, Weiliang Jin, and Shanhui Fan "Nighttime >100mW/m2 power generation using radiative cooling", Proc. SPIE 12513, Energy Harvesting and Storage: Materials, Devices, and Applications XIII, 125130A (15 June 2023); https://doi.org/10.1117/12.2667184
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KEYWORDS
Atmospheric optics
Earth's atmosphere
Energy harvesting
Engineering
Space operations
Technology
Thermography
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