solar_utilization_lec_6_CSP

# solar_utilization_lec_6_CSP - Solar Utilization 1878 Paris...

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UNIVERSITY OF FLORIDA 1 Solar Utilization 1878 Paris World Exibition : On 29th September, Augustin Mouchot used the absorption machine of Edmund Carré to obtain the first piece of ice with solar energy.

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UNIVERSITY OF FLORIDA 2 Solar Utilization Father Manuel A. Gomes near his Pyrheliophoro which he showed to the public during the Universal Exposition of Saint Louis (USA), in 1904, where he obtained the Grand Prize (50 m2; ~3800ºC).
UNIVERSITY OF FLORIDA 3 Solar Utilization Solar Concentrating Collectors   consider the two concentration ratios: optical and  geometric CR o  = I r /I a =ratio of solar flux (e.g. btu/hft 2 )incident on  receiver to that on aperature, no info on areas so it doesn’t  tell us much about losses CR = A a /A r   = geometric ratio(more commonly used  ratio)  generally collect only a small portion of the diffuse  radiation incident on their aperture  the maximum concentration permitted by the second law  is simply the reciprocal of the radiation shape factor, F as    the shape factor for a concentrating collector is equal to  the sine of the acceptance half angle,  θ max

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UNIVERSITY OF FLORIDA 4 Solar Utilization Solar Concentrating Collectors   the acceptance half angle is the coverage of  ½  the  angular zone within which radiation is accepted (“seen”) by  the receiver   the max concentration ratio for a 2-D concentrator is then  equal to 1/sin  θ max see section 3.5.2 for optical limits of concentration sin Θ max
UNIVERSITY OF FLORIDA 5 Solar Utilization Concentration ratio CR T stagnation 1 364K (91 deg C) 10 648 100 (trough collectors) 1152 1000 (towers) 2049 5000 3064 10000 (dish) 3644 Steam production Thermochemical reactions 25 . 0 * = σ I CR T stagnation I = 1kW/m 2 = 1 sun α = ε = 1 σ = 5.67*10 -8 W/m 2 K 4 Why we might need to consider solar power as an application

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UNIVERSITY OF FLORIDA 6 Solar Utilization Solar Concentrating Collectors can be characterized by amount of tracking required to maintain the sun within the acceptance angle and whether the tracking is single or double axis the larger the acceptance angle, the less frequently the collector has to be adjusted and the less accurately tracking can involve intermittent tilt angle adjustment or can be completely fixed the least complex concentrating collectors have large acceptance angles, moderate concentrating ratios and single curvature designs
UNIVERSITY OF FLORIDA 7 Solar Utilization Tubular Solar Energy Collectors   reduce parasitic losses normally seen with flat plate  collectors by reducing convection losses from the absorber    can obtain a minimal amount of concentration effect

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