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  • 22-09-2013

    Technical note

    Flat plate collector utilizability for Guyana
    R.D. Hazel†, L.P. Langevine‡
    † Department of Physics, University of Guyana, Turkeyen, Georgetown, Guyana
    ‡ Solar Energy Laboratory, Institute of Applied Science and Technology, Turkeyen, Georgetown, Guyana
    Abstract
    The objective of this study was to analyze one year of hourly solar radiation data from Georgetown, Guyana, and derive a simplified tool in the form of a utilizability curve for designing solar thermal systems with fixed flatplate collectors. The significance of the utilizability curve is demonstrated with the solution of a typical design problem—the sizing of solar crop drying systems. For instance it is shown that an advanced flatplate collector [U/η0 = 3 W/m2°C and FR(τα) = 0.95 with Ac = 16 m2, delivers 29.6 MJ of energy per hour while heating ambient air from 30 to 50°C. Renewable Energy Volume 4, Issue 4, June 1994, Pages 437–439

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  • 29-09-2013

    Blueberry Solar Panel

    Demonstrating Electron Transfer and Nanotechnology: A Natural Dye–Sensitized Nanocrystalline Energy Converter Greg P. Smestad
    Solar Energy Materials and Solar Cells, P.O. Box 51038, Pacific Grove, CA 93950
    Michael Grätzel
    Institute of Physical Chemistry, ICP-2, Swiss Federal Institute of Technology, CH-1015, Lausanne, Switzerland
    Abstract
    A unique solar cell fabrication procedure has been developed, using natural anthocyanin dyes extracted from berries. It can be reproduced with a minimum amount of resources, providing an interdisciplinary approach for lower-division undergraduate students learning the basic principles of biological extraction, physical chemistry, spectroscopy, environmental science, and electron transfer. Electron transfer is the basis of the energetics that drives the processes of life on Earth. It occurs in both the mitochondrial membranes of living cells and the thylakoid membranes in photosynthetic cells of green plants and algae (1). Although we depend on the products of this electron and energy transfer in the form of petroleum and agricultural products, one of the greatest challenges of the 21st century is that we have yet to create devices that can be used to tap directly into the ultimate source of this energy on an economic scale. An experimental lab procedure was therefore created to illustrate the connections between natural and manmade solar conversion within a three-hour lab period

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  • 29-09-2013

    Natural News

    Blueberry pigments may replace silicon in solar panels

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