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Numerical Simulation of Aiming Point Strategy Method for Small Heliostat Field for Optimization of the Receiver Size
, Chandradeep Nagarale
Published in International Engineering Research Journal (IERJ)
Pages: 258.0 - 261.0
In a solar central receiver system, solar radiation is concentrated on a tower mountedheat exchanger (receiver) by the use of mirrors called heliostats. These thermal systemsare able to reach high temperatures and to obtain such temperatures; a high solar flux isrequired. This is achievable by aiming all of the heliostats at the center of the target.Due to this, high flux gradients over the receiver surface area and between the outer andinner surfaces of the receiver material can exist. These thermal gradients account fordifferences in temperatures on the receiver which results in thermal stresses leading toelastic and potentially plastic deformation of the receiver material. To eradicate thethermal stresses, the aim points of the heliostats can be managed such that the fluxdensity distribution over the receiver aperture is decreased and homogenized. Theprimary objective of this paper is to develop an aiming strategy specifically for smallexperimental heliostat fields. There are different methods for eliminating thetemperature gradient on the receiver plate like Aiming point Strategy, FieldModifications, Sizing the receiver. The SOLTRACE software, developed by NREL(National Renewable Energy Laboratory, United States) for the calculation of fluxdistribution maps has been implemented and used for simulating the solar field. Theanalysis is carried out for the flux distribution obtained by this simulation with aimingstrategy and without aiming strategy. Based on the results obtained from the simulationwith aiming point strategy in SOLTRACE software the homogenized flux image sizewill be optimized.
About the journal
JournalInternational Engineering Research Journal (IERJ)
PublisherInternational Engineering Research Journal (IERJ)
Open Access0