Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"heliostat"”.
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Fluid-structure interaction investigation of a medium-sized heliostat
… fuels. Concentrated Solar Power plants utilizing heliostats, large reflecting mirrors, to concentrate the sun’s solar energy onto a central tower are one are the main solar technologies in use today. These plants consist of hundreds to hundreds of thousands of heliostats. The heliostats in most …
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Design of heliostat system for demonstration of fabrication and functionality
… A promising option is the use of arrays of heliostats combined with a central receiver. A heliostat is a structure that tracks the position of the sun in two axes to direct sunlight to a central target point with the use of a mirror. In this project, I have designed and built a system of …
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Optimization of central receiver concentrated solar thermal : site selection, heliostat layout & canting
… solar thermal plants and (ii) optimization of heliostat field layouts for any terrain. Additionally, optimization of heliostat canting, is presented as an application of the heliostat layout optimization model. Using the site selection model, suitable sites are located based on heliostat field …
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Long-Distance Flux Mapping Using Low-Cost Collimated Pyranometers
… capacities of 100 MWe or greater require large heliostat fields with heliostats over 1,500 m (nearly a mile) away from the tower. The accuracy and performance of these heliostats must be evaluated and understood as new heliostat designs emerge to reduce costs. Conventional beam characterization …
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Collecting heat during the day, observing the sky at night : the use of a heliostat field near Almeria to search for cosmic gamma rays
… to the observation of gamma-rays common to all heliostat arrays. In particular, the effect of a field of view restricted to the central part of a detected air shower on the lateral distribution and timing properties of Cherenkov light are discussed. Under angular restriction the differences …
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Investigation of integrated systems for clean ammonia synthesis
… considers different energy sources such as solar heliostat-assisted natural gas reforming, biomass gasification, industrial thermal management solar PV and wind energy-assisted and solar heliostat field-driven integrated energy systems. An experimental cascaded ammonia synthesis system is also …
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Computer simulations to calculate energy flux and image size on a receiver for different reflector geometries using caustics
… device used for concentrating the sun is the Heliostat, which is sun-tracking system comprised of mirror segments used to reflect sunlight onto a predefined target. This project aims to connect solar energy flux and image size on the target to the ratio of aperture size and focal length of a …
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Small-Scale Solar Central Receiver System Design and Analysis
… for determining the proper size and layout of heliostats, optimal tower height, receiver size, and turbine engine selection are developed. In this specific design, solar shares of up to 73.2% and an annual average of 44% are possible through the use of a gas-solar hybrid microturbine engine. …
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Conceptual development and analysis of multiple integrated hydrogen production plants with Cu-Cl cycle
… Cu-Cl cycle. The third system consists of solar heliostat steam generator, Rankine cycle, compression system and five-step Cu-Cl cycle. The fourth system consists of SCWR, four-step Cu-Cl cycle, Rankine cycle and compression system. Modeling the developed systems is carried out using Aspen Plus, …
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New methods and results in the optimisation of solar power tower plants
… In Chapter 2, the cleaning operations of the heliostat eld are optimised for a xed schedule length using Binary Integer Linear Programming (BILP). Problem dimensionality is addressed by a clustering algorithm, before an ini- tial solution is found for the allocation problem. Finally, a novel …
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Modelling High-Temperature Thermal Storage Systems for Concentrated Solar Power Plants
… A multi-objective optimisation of heliostat field, receiver and detailed storage geometry was performed to minimise the levelised cost of electricity (LCOE) and maximise capacity factor of the sodium-boiler system and a reference, conventional 100 MWe two-tank molten salt system. …
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Modelling High-Temperature Thermal Storage Systems for Concentrated Solar Power Plants
… A multi-objective optimisation of heliostat field, receiver and detailed storage geometry was performed to minimise the levelised cost of electricity (LCOE) and maximise capacity factor of the sodium-boiler system and a reference, conventional 100 MWe two-tank molten salt system. …
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Development and assessment of renewable energy based integrated systems for dimethyl ether production
… system. The second system consists of a solar heliostat field, solid oxide steam electrolyzer, carbon capturing and heat recovery system from steel furnace, methanol synthesis system and dimethyl-ether synthesis system. The third system consists of gas turbine cycle, Cu-Cl thermochemical …
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Experimental investigation and analysis of a new light-based hydrogen production system
… capacity of 2.8 kg hydrogen per square meter of heliostat with a production cost of 1$/kg hydrogen produced. In addition to converting by-products into usable commodities, the system does not emit GHG during operation.
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Analysis, assessment and optimization of integrated solar energy systems for multigeneration
… hot water. The third main system is based on heliostat solar system integrated with steam turbine for multigeneration purposes. The system produces cooling, heating, fresh water and hydrogen through electrolysis.
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Design, analysis and optimization of novel photo electrochemical hydrogen production systems
… Energy, exergy, and exergoeconomic models for a heliostat based hybrid system are developed. A radiation model is coupled with a thermodynamic model in order to predict the rate of hydrogen, chlorine, and sodium hydroxide production for a given light intensity at a particular time. The parameters …
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Experimental and Numerical Investigation on Particle-gas Flows in Open Vortex-based Solar Cavity Receivers
… profile was adopted to mimic that from a heliostat field on a clear day. For the receiver configuration of an air-particle heater, the energetic thermal efficiency was compromised with the flow residence time and the mass flow rate, featuring a highest value of 83%. For a steam heater …
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The Role of Mirror Errors in Solar Energy Conversion
Sunlight is an abundant and renewable source of energy, and the expanding solar industry uses many different methods to convert this energy to work. Some of these methods (engines) use mirrors to reflect radiation. However, the mirrors are not perfect and have slope, shape, tracking, and …
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The Role of Mirror Errors in Solar Energy Conversion
Sunlight is an abundant and renewable source of energy, and the expanding solar industry uses many different methods to convert this energy to work. Some of these methods (engines) use mirrors to reflect radiation. However, the mirrors are not perfect and have slope, shape, tracking, and …