a novel open-source master-slave heliostat
TRANSCRIPT
A novel open-source master-slave heliostat array for use as an
experimental platform and solar power applicationsR. Evans, A. Sanchez Garcia
LEARS, CICESETUESDAY, 5 NOVEMBER 2013
ISES SWC Cancun Mexico
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the solar challenge
• maximize aperture to sun
• minimize radiation loss to environment
• the sun moves
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• 30% increase with sun tracking
• more in the summer
• trackers cost more then 30% of a panel
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Mexico specific challenge• No local market –starting from nothing
• DIY, no loan economy
• Low adoption of foreign technologies
• parts and price
• Mini- µ-business economy: 10-200 kW
• Low formal education of end users DR. R. EVANS 2013
Open designOpen energyOpen energy
• Use open design
• Creative commons
• Master-slave design
• Built from locally accesible components
• Hybrid tracking system (active-absolute)DR. R. EVANS 2013
Master slave heliostat arrayOne heliostat to control them all… DR. R. EVANS 2013
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Bowden Tubes
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Heliostat system, Amo with cross-hair, optical sensor and photovoltaic cells, Slave with giant fresnel lens
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Suntargetmirror?
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Suntarget mirror?
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Suntarget mirror
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Sun
target mirror?
Control systemOptical sensor, solid-state relay, change system, micro
controller
encoder 1
encoder 2
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Optical sensorVoltage divider with photo-resistors DR. R. EVANS 2013
Solid state relaylow power consumption DR. R. EVANS 2013
Sensor responseorthononality DR. R. EVANS 2013
Nonlinearity fixedunbalanced resistance: adding variable resistor may fix
problem. DR. R. EVANS 2013
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References[1] S.A.Kalogirou, Solar Energy Engineering, processes and systems, 1st Edition, Elsevier Inc.,San Diego, USA, 2009.[2] G. M. noz Meléndez, E. Díaz-Gonza`lez, H. E. Cambell-Ramírez, M. Q.-N. nez, Baja california: Perfil energético 2010-2020, Tech. rep., Comision Estatal de energ` a de Baja ıCalifornia, Avenida Pioneros 1060 Col. Centro Civico C.P. 21000, Mexicali, Baja California (2012). [3] C.Commons.Atribució n-licenciamiento recíproco 2.5 (méxico)[online](072013)[cited30-06-2013]. [4] C.Commons.Attribution-sharealike3.0unitedstates[online](072013)[cited30-06-2013]. [5] Arduino homepage [online] (072013) [cited30-06-2013]. [6] R.Evans. Github share of heli-stato-amo-esclavo [online] (062013) [cited30-06-2013].
