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Bionic Photovoltaic Panels Bio-Inspired by Green Leaves

Journal of Bionic Engineering 2010年第3期7卷 284-293页

作者： MatthiasZhr Dennis Friedrich Tania Y.Kloth Gerhard Goldmann Helmut Tributsch Technische Fachhochschule Berlin Helmholtz-Zentrum

In strong solar light, silicon solar panels can heat up by 70℃ and, thereby, loose approximately one third of their efficiencyfor electricity generation. Leaf structures of plants on the other hand, have developed a series of technological adaptations,which allow them to limit their temperature to 40-45℃ in full sunlight, even if water evaporation is suppressed. This is accomplishedby several strategies such as limitation of leaf size, optimization of aerodynamics in wind, limitation of absorbedsolar energy only to the useful fraction of radiation and by efficient thermal emission. Optical and infrared thermographicmeasurements under a solar simulator and in a streaming channel were used to investigate the corresponding properties of leavesand to identify suitable bionic model systems. Experiments started with the serrated structure of ordinary green leaves distributedover typical twig structures and finally identified the Australian palm tree Licuala ramsayi as a more useful bionic model. Itcombines a large area for solar energy harvesting with optimized aerodynamic properties for cooling and is able to restructureitself as a protection against strong winds. The bionic models, which were constructed and built, are analyzed and discussed.

关键词： bionics photovoltaic panel green leaves heat control Licuala ramsayi

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微矩形槽内的单相强迫对流换热性能实验(英文)

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Chinese Journal of Aeronautics 2003年第1期16卷 7-11页

作者：赵增会余建祖 Faculty 505 Beijing University of Aeronautics and Astronautics Beijing 100083 China

Increase in the integration and package density of aviation electronic equipment provides severe challenge to heat control for electronic components, yet the microchannel radiator offers an efficient method for solving the problem of cooling electronic chips and devices. In this paper, 6 micro rectangle channels with different sizes were designed and fabricated; the experiment of single\|phase forced convection heat transfer was conducted with solution of CH\-5OH, the most commonly used coolant for aviation electronic equipment, flowing through those microchannels. The influences of liquid velocity, degree of coolant supercooling, and configuration of microchannels on the heat transfer characteristics were analyzed respectively.

关键词： microchannel forced convection heat transfer heat control

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