Shadowing and Blocking Effect Optimization for a Variable Geometry Heliostat Field

Cádiz, P.; Frasquet, Miguel; Silva, M.; Martínez, Fernando Rey; Carballo, Jose A.

doi:10.1016/j.egypro.2015.03.008

Cited by 11 publications

(3 citation statements)

References 3 publications

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“…On the other side, the upper limit for the superheated steam temperature is set 520 °C, considering a temperature difference between the hot HTF and the superheated steam of 45 °C. The specific heat, c p , J (kg o C) -1 , and density, ρ, kg m −3 , of HTF were calculated using equation (1) and equation (2) (Cádiz et al, 2015; Kenisarin, 2010):…”

Section: Methodsmentioning

confidence: 99%

Waste to energy efficiency improvements: Integration with solar thermal energy

2019

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Hybridisation of waste to energy with solar facility can take competing energy technologies and make them complementary. However, realising the benefits of solar integration requires careful consideration of the technical feasibility as well as the economic and environmental benefits of a proposed system. In this work, a solar-integrated waste-to-energy plant scheme is proposed and analysed from an energy, environmental and economic point of view. The new system integrates a traditional waste-to-energy plant with a concentrated solar power plant, by superheating the steam produced by the waste-to-energy flue gas boiler in the solar facility. The original waste-to-energy plant – that is, the base case before introducing the integration with concentrated solar power – has a thermal power input of 50 MW and operates with superheated steam at 40 bar and 400 °C; net power output is 10.7 MW, and the net energy efficiency is equal to 21.65%. By combining waste-to-energy plant with the solar facility, the power plant could provide higher net efficiency (from 1.4 to 3.7 p.p. higher), lower specific CO2 emissions (from 69 to 180 kg MWh-1 lower) and lower levellised cost of electricity (from 13.4 to 42.3 EUR MWh-1 lower) comparing with the standalone waste to energy case. The study shows that: (i) in the integrated case and for the increasing steam parameters energy, economic and ecological performances are improved; (ii) increasing the solar contribution could be an efficient way to improve the process and system performances. In general, we can conclude that concentrated solar-power technology holds significant promise for extending and developing the waste to energy systems.

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Section: Methodsmentioning

confidence: 99%

Waste to energy efficiency improvements: Integration with solar thermal energy

2019

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“…In power tower systems, the heliostat field is one of the essential subsystems. This is due to its significant contribution to the plant's total investment cost: about 40%-50% of the plant's cost is attributed to the heliostat field [8][9][10][11][12]. The field contributes equally to the plant's overall power losses of about 40% [8,[13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…E. Carrizosa et al [17] presented a pattern-free heliostat field layout distribution style, obtained by the simultaneous optimization of both the heliostat field (heliostat locations and number) and the tower (tower height and receiver size). Cadiz et al [10] presented shadowing and blocking optimization procedures for a variable-geometry heliostat field. The variable-geometry concept explored by the author allows the possibility of minimizing the cosine losses by rotating the entire field.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Design of Multi-Tower Concentrated Solar Power Fields

2020

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In power tower systems, the heliostat field is one of the essential subsystems in the plant due to its significant contribution to the plant's overall power losses and total plant investment cost. The design and optimization of the heliostat field is hence an active area of research, with new field improvement processes and configurations being actively investigated. In this paper, a different configuration of a multi-tower field is explored. This involves adding an auxiliary tower to the field of a conventional power tower Concentrated Solar Power (CSP) system. The choice of the position of the auxiliary tower was based on the region in the field which has the least effective reflecting heliostats. The multi-tower configuration was initially applied to a 50 MWth conventional field in the case study region of Nigeria. The results from an optimized field show a marked increase in the annual thermal energy output and mean annual efficiency of the field. The biggest improvement in the optical efficiency loss factors be seen from the cosine, which records an improvement of 6.63%. Due to the size of the field, a minimal increment of 3020 MWht in the Levelized Cost of Heat (LCOH) was, however, recorded. In much larger fields, though, a higher number of weaker heliostats were witnessed in the field. The auxiliary tower in the field provides an alternate aim point for the weaker heliostat, thereby considerably cutting down on some optical losses, which in turn gives rise to higher energy output. At 400 MWth, the multi-tower field configuration provides a lower LCOH than the single conventional power tower field.

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Cosine Efficiency Distribution with Reduced Tower Shadowing Effect in Rotating Heliostat Field

Bouamra

Merzouk

2018

Arab J Sci Eng

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Shadowing and Blocking Effect Optimization for a Variable Geometry Heliostat Field

Cited by 11 publications

References 3 publications

Waste to energy efficiency improvements: Integration with solar thermal energy

Waste to energy efficiency improvements: Integration with solar thermal energy

Numerical Simulation and Design of Multi-Tower Concentrated Solar Power Fields

Cosine Efficiency Distribution with Reduced Tower Shadowing Effect in Rotating Heliostat Field

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