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DTSTART;TZID=America/New_York:20190328T110000
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CREATED:20190318T142043Z
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UID:1485-1553770800-1553774400@seasevents.nmsdev7.com
SUMMARY:ESE Seminar: "Control of Light and Heat for New Energy Applications"
DESCRIPTION:Light carries energy and heat\, and plays a key role in many energy-conversion processes. The capabilities\nto tailor electromagnetic energy transfer at the nanoscale represent important opportunities for novel\nenergy applications. In this talk I will present two sets of studies integrating experiments and theory. In\nthe first part\, I will discuss how to use near field electromagnetic energy transfer for energy conversion\nand photonic refrigeration. I will begin by showing an experiment achieving a 40-fold enhancement of\nthermophotovoltaic conversion rates\, by reducing the distance between a thermal emitter and a\nphotovoltaic cell to the nanoscale. This lays the foundation for exploring near-field thermophotovoltaics\nfor waste heat recovery. I will then show a demonstration of active photonic refrigeration through control\nof the chemical potential of photons. This points to a fundamentally new\, promising way for solid state\nrefrigeration by combining nanoscale photonics and optoelectronics.\nIn the second part\, I will discuss how to turn the cold outer space to a thermodynamic resource for passive\ncooling and energy efficiency. I will introduce our first demonstration of passive radiative cooling to\nbelow the ambient air temperature under direct sunlight. Next I will show an experiment achieving\npassive cooling to 42 ˚C below the ambient temperature\, pointing to new regimes of applications such as\nfood preservation in remote areas. I will also show results of lowering the temperature of a solar absorber\nby 13 ˚C while maintaining the sunlight absorption\, pointing to significant efficiency improvement for\nsolar cells. Finally\, I will give an overview of my future research directions.
URL:https://seasevents.nmsdev7.com/event/ese-seminar-control-of-light-and-heat-for-new-energy-applications/
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
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