Solar Tracking System for a Linear Fresnel Plant with Two Degrees of Freedom Reflectors

Cucumo, Mario Antonio; Ferraro, Vittorio; Kaliakatsos, Dimitrios; Nicoletti, Francesco

doi:10.18280/ti-ijes.632-405

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…In a traditional Fresnel linear system, the end losses are caused by the solar tracking system which allows the reflectors to be rotated only around an axis. The law of motion of reflectors is the following [10]: (1) In Eq. (1), β represents the angle between the normal of the reflector and the horizontal direction East; d is the distance of the reflector from the center of the plant; h is the height of the tube from the plane of the mirrors; a and α are the azimuth and the solar altitude respectively.…”

Section: Figure 1 End Lossesmentioning

confidence: 99%

Study of Kinematic System for Solar Tracking of a Linear Fresnel Plant to Reduce End Losses

Cucumo¹,

Ferraro²,

Kaliakatsos³

et al. 2019

EJEE

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Linear Fresnel Plants are composed of flat mirrors that reflect direct radiation towards a fixed receiver tube parallel to the reflectors. In traditional plants, mirrors are able to rotate around a single axis. This type of solar tracking system generates high losses at its ends. In the paper a new configuration is studied in which the mirrors placed at the ends are moved around two axes. The proposed system is thus able to recover the direct radiation which, otherwise, would not reach the receiver tube. The rotation of the mirrors is managed by stepper servomotors. They allow a robust solar tracking, not influenced by external forces. The work presents the kinematic system for moving the field of mirrors actuated with open loop control. Stepper motors generate a motion by steps; in order to execute each step at the exact moment, the logic of movement is properly defined. It is necessary to know in detail the temporal position and the law of motion for each rotation to identify the driving logic of the motors. The behaviour of the "electric motor-mechanical system" is numerically modelled, evaluating the torque and the errors in the motion.

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Section: Figure 1 End Lossesmentioning

confidence: 99%

Study of Kinematic System for Solar Tracking of a Linear Fresnel Plant to Reduce End Losses

Cucumo¹,

Ferraro²,

Kaliakatsos³

et al. 2019

EJEE

Self Cite

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“…The first allow the absorption and eventually accumulation of thermal energy thanks to a heat transfer fluid, to then be used for industrial or domestic purposes. In the latter, a thermodynamic cycle is added to the incident solar energy collection phase (usually a Stirling cycle or a Rankine cycle) for the transformation of the thermal energy collected into electricity, via an alternator [6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Concerning the costs of the electricity produced, only the initial investment costs and maintenance costs affect them, as solar radiation is exploited as the primary source. In the future, it is expected, however, that they can be further reduced thanks to the entry on the market of an increasing number of suppliers [7][8].…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the dispersion of the reflected light, numerous studies have been carried out on the geometries of a secondary reflective surface to be installed above the tube to re-concentrate the rays [9]. The absorber tube is crossed by molten salts or diathermic oil that heat up, or by water that evaporates producing steam, which is sent into a turbine for the direct production of electricity [7].…”

Section: Introductionmentioning

confidence: 99%

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Contribution to the Simulation and Parametric Analysis of the Operation of a Solar Concentration Thermal Installation

Benramdane¹,

Abboudi²,

Ghernaout³

2019

IJHT

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The objective of this contribution is to highlight the direction of variation in thermal efficiency in order to determine the optimum thermodynamic parameters for the best operation of the solar concentrating heat machine. The machine studied as part of this article works in part following the ideal cycle of RANKINE and other part by following the ideal cycle of HIRN (improved installation). The preferred approach to achieve the objectives is based on: − Influence of low pressure and high pressure for a machine working according to the ideal RANKINE cycle. − And the temperature of overheating for installation next up the ideal cycle of HIRN. Simulations for different modifications on the RANKINE and HIRN cycles show that for an increase in the superheat temperature, the increase of the high pressure and the reduction of the low-pressure lead to a better yield. This contribution consists, from the simulations, to make a parametric analysis of the operation of an installation in order to propose a possible improvement.

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“…Regarding the degree of freedom, there are two main types of tracking systems; single-axis trackers and dual-axis trackers. LFR systems are usually installed with one-axis tracking [2][3][4][5], however, recently, two-axis tracking system has been used to improve the optical efficiency of LFR systems [6,7]. Regarding the control strategy, two main types open-loop [6][7][8] and closed-loop controlled trackers [5,9,10].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of IoT-Enabled, Low-Cost Distributed Angle Measurement System

Meligy

Picallo

Klaina

et al. 2019

The 6th International Electronic Conference on Sensors and Applications

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A Linear Fresnel Reflector (LFR) is a recent technology with good potential in small-scale solar power applications. It is composed of many long rows of mirrors that focus the sunlight onto a fixed elevated tubular receiver. Mirror segments are aligned horizontally and track the sun such that the receiver does not need to be moved. The efficiency with which the LFR can convert solar to thermal energy depends on the accuracy of the sun tracking system. To maximize the degree of sunlight capture, precise solar tracking is needed so that incident solar rays can be adequately focused to the focal point given by the location of the tubular receiver. The tilt angles of each row are relevant for the tracking controller to achieve correct positioning. Encoders are generally employed in closed-loop tracking systems as feedback signals used to inform the controller with the actual position of collector mirrors. Recently, inclinometers have begun to replace encoders as the most viable and cost-effective sensor technology solution; they offer simpler and more precise feedback, as they measure the angle of tilt with respect to gravity and provide the ability to adjust the system to the optimal angle for maximum output. This paper presents the research results on the development of remote measurements for the precise control of an LFR tracking system, by using distributed angle measurements. The applied methodology enables precision measurement LFR inclination angles through the fusion of data from multiple accelerometers, supported by low-cost wireless transceivers in a wireless sensor network, capable of exchanging information in a cloud infrastructure.

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Solar Tracking System for a Linear Fresnel Plant with Two Degrees of Freedom Reflectors

Cited by 7 publications

References 7 publications

Study of Kinematic System for Solar Tracking of a Linear Fresnel Plant to Reduce End Losses

Study of Kinematic System for Solar Tracking of a Linear Fresnel Plant to Reduce End Losses

Contribution to the Simulation and Parametric Analysis of the Operation of a Solar Concentration Thermal Installation

Analysis and Design of IoT-Enabled, Low-Cost Distributed Angle Measurement System

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