Solar energy at high temperatures; researches at the Weizmann Institute of Science, Israel; 25 years of success

Segal, A.

doi:10.1051/rees/2016001

Cited by 14 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ray tracing method proposed by scholars Zhang Guoxun and Rao Xiaoshu [6] and the technique suggested by Segal [7] can effectively reduce ground spotlight clusters, implicitly reducing the spotlight area through truncation. Although this approach unavoidably leads to increased optical loss, it effectively avoids compromising overall performance.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the field optical efficiency of a solar tower photothermal mirror with double shade shielding and a multi-base collector efficiency model

Zhang

2024

International Conference on Optoelectronic Information and Functional Materials (OIFM 2024)

View full text Add to dashboard Cite

Optical efficiency is a crucial evaluation parameter for assessing the strengths and weaknesses of tower heliostat fields. Previous studies have indicated that optical efficiency is determined by factors such as shadow blocking rate, cosine efficiency, collector truncation efficiency, atmospheric transmission, and specular reflectance. This paper enhances the modeling of shadow blocking rate and collector truncation efficiency by abstracting real-world scenarios into mathematical problems involving trigonometric functions, coordinate systems, and normal vectors. For the shadow blocking rate, we establish a double shadow blocking model that considers both the inter-heliostat shadows and shadows between the absorption tower and heliostats. Regarding collector truncation efficiency, we develop a multi-base collector efficiency model that takes into account various combinations of intersecting sections between the cone beam's irradiation area on the collector surface and its absorption/reflection area. The inclusion of shadow blocking considerations along with categorizing intersections between beam illumination areas and collector absorption areas enables more universal, accurate, and practical calculations of optical efficiency. To evaluate our proposed method's performance, we calculate and compare the annual average optical efficiencies in a specific scenario using both our approach and traditional methods.

show abstract

Section: Introductionmentioning

confidence: 99%

Calculation of the field optical efficiency of a solar tower photothermal mirror with double shade shielding and a multi-base collector efficiency model

Zhang

2024

International Conference on Optoelectronic Information and Functional Materials (OIFM 2024)

View full text Add to dashboard Cite

show abstract

“…This is accomplished by a secondary reflector that is located at the top of the tower, where the conventional receiver would have been originally located. Although this idea was proposed in the seventies and eighties [8], the seminal works in this technology were developed in the early 2000s, when the optics, possible applications, and proof-of-concept tests were carried out by Segal and Epstein [9][10][11]. They compared two secondary reflectors: an ellipsoid (concave) and a hyperboloid (convex), concluding that the hyperboloid provides the best performance.…”

Section: Introductionmentioning

confidence: 99%

“…Several experimental facilities have tested the beam-down receiver (BDR) concept. The first experimental facility built with this concept was developed by the Weizmann Institute of Science in Israel [11] in 1999. The plant has a nominal capacity of 0.7 MW th with a 75 m 2 hyperboloid mirror and a 2.2 m-aperture diameter CPC.…”

Section: Introductionmentioning

confidence: 99%

A Novel Dual Receiver–Storage Design for Concentrating Solar Thermal Plants Using Beam-Down Optics

Saldivia

Taylor

2023

Energies

View full text Add to dashboard Cite

Advanced power cycles—such as the supercritical carbon dioxide (sCO2) cycle—have the potential to reduce the levelized cost of energy (LCOE) of concentrated solar thermal power (CST) plants by significantly boosting their overall solar-to-electric efficiency. To successfully integrate these cycles into CST plants, the industry may need to transition away from liquid working fluids (e.g., synthetic oils and molten salts) to solid and/or gaseous heat transfer media, which are more stable at high temperatures. To address this challenge, this study investigates a novel rotating receiver–storage unit that could enable high-temperature CST plants. A validated numerical model is presented for the charging and discharging processes of the proposed design. It was found that with cast steel as the storage medium in the proposed design, it is possible to achieve >70% receiver efficiency for operation temperatures of 850–1000 K. The overall plant model shows this design is best for relatively small CST systems as modularized units of 10 m diameter (reaching an energy density around 80 kWh/m3), which can be used to drive a 5 MWe sCO2 CST plant. These findings suggest that such a design would have up to 9 h of storage and could be effectively employed as an efficient peaking plant.

show abstract

Hydrogen from solar thermal energy

Villafán-Vidales¹,

Arancibia-Bulnes²,

Valadés-Pelayo³

et al. 2019

Solar Hydrogen Production

View full text Add to dashboard Cite

Solar energy at high temperatures; researches at the Weizmann Institute of Science, Israel; 25 years of success

Abstract: The paper describes the features of the solar complex at the Weizmann Institute of Science and the projects successfully realized during its 25 years of operation.

Cited by 14 publications

References 22 publications

Calculation of the field optical efficiency of a solar tower photothermal mirror with double shade shielding and a multi-base collector efficiency model

Calculation of the field optical efficiency of a solar tower photothermal mirror with double shade shielding and a multi-base collector efficiency model

A Novel Dual Receiver–Storage Design for Concentrating Solar Thermal Plants Using Beam-Down Optics

Hydrogen from solar thermal energy

Contact Info

Product

Resources

About