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1

Heat Flux Distribution Estimation for CSP Applications

Stokos Konstantinos, Votyakov Evgeny, Papanicolas Costas

Journal of Power Technologies

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2024

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Vol. 104, nr 1

56--66

EN

In this paper the concept of a new method for the estimation of the heat flux distribution and the total power in CSP applications is presented. This method requires appropriate analysis of the temperature evolution on a target, or directly on a receiver. A 3-D thermal conduction model with boundary conditions to take into account the convection and radiation losses has been developed. A parametric analysis was performed and we checked how the physical parameters affect the applicability of the method. Having proven numerically the potential of this method, it was experimentally implemented in the central tower CSP plant of The Cyprus Institute at PROTEAS facilities successfully. Finally, experience gained from the numerical and experimental application of this method is discussed.

2

Insights of Concentrated Solar Power Utilization – Possible Deployment in Jordan

As’ad Samer

Ecological Engineering & Environmental Technology

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2024

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Vol. 25, iss. 1

152--163

EN

Concentrated solar power (CSP) is a promising form of renewable energy that harnesses the immense power of the sun to generate electricity. It employs various mechanisms to concentrate sunlight onto a receiver, thereby producing high-temperature heat. This heat can be stored and converted into electricity through conventional steam turbines or for other heating applications. One of CSP’s key advantages is its ability to store thermal energy for use during cloudy periods or at night, enhancing the reliability and dispatchability of solar power. This review article offers a comprehensive introduction to CSP including its principles, technological advancements, comparison analysis, and its potential to play a crucial role in the transition to a sustainable toward carbon neutral energy future. Various statistical charts on the operational CSP plants around the world have been presented in this review and showed that there is a notable interest in the MENA region for considering this technology in their energy mix. Jordan is part of the MENA region, therefore, possible deployment of this technology in the kingdom of Jordan has been assessed as well by studying the solar radiation measurements in the southern location of the country. Analysis has concluded that Ma’an governorate has the highest solar irradiance characteristics in the country and has the lowest values of diffuse irradiance. The annual average daily global irradiance is between 3.7 kWh/m2 in January to 8.5 kWh/m2 in June, equivalent to annual global radiation of more than 2200 kWh/m2. The results have been validated using Global Solar Atlas and ener MENA high precision meteorological station installed in Ma’an. The costs and current challenges faced by this technology will also be discussed.

3

Enhancement of convective heat transfer in a parabolic trough collector using vibrations - an introductory numerical analysis

Grzywnowicz Krzysztof, Bartela Łukasz, Remiorz Leszek, Stanek Bartosz

Journal of Power Technologies

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2020

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Vol. 100, nr 4

291--300

EN

Energy generation systems based on renewable energy sources (RES) are rapidly gaining ground in the global power and heatmarket. Most of these systems are well-suited to distributed energy solutions, including distributed heat production. Individual users and local low-power plants can use solar thermal devices for the purpose of providing domestic hot water, heating and cooling. Nevertheless, the variability of solar irradiance can make it difficult to harvest energy efficiently all year round. Therefore, from the point of view of improving the overall, year-averaged operational parameters of a solar thermal device it isparamount to maximize the heat acquired from it at times ofhigh radiation flux. This paper discusses computational research on enhancing convective heat transfer in the absorber of a parabolic trough collector (PTC), through inducing vibrations of an immersed flat plate. The investigation identifies the influence of different amplitudes and frequencies of oscillatory motion on the absorber’s parameters, compares them with the construction of a classical absorber and considers flow turbulization. The results indicate there is only a limited application of vibrations to enhance operational parameters of solar thermal absorbers, with the best results obtained for thermal fluidflows of below 0.1 dms.

4

Techno-Economic Assessment of Concentrating Solar Power and Wind Hybridization in Jordan

Ayadi O., Alsalhen I. A.

Journal of Ecological Engineering

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2018

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Vol. 19, nr 2

16--23

EN

The variable renewable wind and solar resources have experienced a significant growth on its rate of deployment as a clean and competitive alternative for conventional power sources in Jordan. However, the variability of these sources have brought many technical challenges to grids. This paper presents a hybrid system that provides a firma capacity and improves dispatchability with an interesting financial perspective. This hybrid system includes a wind farm and a concentrated solar power plant with thermal energy storage. The performance analysis was conducted in terms of final yield and capacity factor, while the economic analysis investigated the levelized cost of electricity LCOE. The hybrid plant was simulated and optimized using TRNSYS 17 energy simulation software, minimizing the LCOE and considering a capacity factor higher than 65% as a constraint. Solar multiple and storage size were considered as decision variables. A strong complementarity between wind and direct normal solar radiation was observed in the selected location in Jordan, which emphasizes the attractiveness of the selected hybrid system. The optimal configuration of the CSP-wind hybrid system was obtained with a solar field of a 2.6 solar multiple and a 5 hours energy storage. The achieved capacity factor was 94%, and the LCOE is lower than those resulted for standalone CSP plants.

5

Analiza możliwości wykorzystania lustrzanych kolektorów nadążnych w warunkach polskich oraz wybór sposobu ich rozmieszczenia

Olczak P., Kryzia D.

Ciepłownictwo, Ogrzewnictwo, Wentylacja

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2016

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T. 47, nr 7

259--264

PL

Sposób rozmieszczenia kolektorów słonecznych na powierzchni płaskiej uwarunkowany jest zastosowanym rozwiązaniem technicznym. W przypadku kolektorów płaskich i próżniowych nie istnieją ograniczenia techniczne w zakresie minimalnej odległości pomiędzy panelami; ma to jednak wpływ na możliwy uzysk ciepła. Natomiast w przypadku kolektorów nadążnych z lustrami koncentrującymi promieniowanie słoneczne umożliwienie ruchu panelu wymusza zachowanie odpowiedniej odległości pomiędzy nimi. Kolektory te, dzięki zastosowaniu prowadzenia za słońcem w dwóch osiach, wyróżnia największy dostęp do promieniowania w skali roku obniżony do iloczynu szerokości i wysokości lustra. Zastosowanie luster sprawia, że ilość dostępnej energii pomniejsza się częściowo o sprawność odbijania luster, ale z drugiej strony mamy do czynienia z mniejszymi stratami ciepła w wyniku zagęszczenia strumienia energii. W przypadku, gdy trzeba rozmieścić więcej niż jeden kolektor na ograniczonej płaskiej powierzchni pojawia się problem wyboru sposobu usytuowania i doboru właściwej odległości międzysłupowej. Na podstawie wykonanej analizy stwierdzono przewagę rozmieszczenia kolektorów w linii południe-północ nad rozmieszczeniem w linii wschód-zachód. Następnie określono warunki temperaturowe pracy, w których występuje przewaga tego typu kolektorów nad kolektorami płaskimi.

EN

The way solar collectors are placed on a flat surface is conditioned by applied technical solutions. In the case of flat plate collectors and evacuated tube collectors there are no technical limitations regarding the minimum distance between the panels; however, distance between panels has an impact on the possible energy yield. Nevertheless, allowing the movement of two axis tracking concentrated solar panels with mirrors enforces a proper distance between them. These collectors, thanks to the use of two axis sun tracking have the greatest access to radiation per year calculated as the width and the mirror height product. The use of mirrors leads to the fact, that the amount of available energy is reduced, in which is partly achieved thanks to the efficiency of reflecting mirrors. On the other hand, using the mirrors results in the greater energy flux density, which, in consequences leads to reducing heat losses. When we want to place more than one collector on a limited flat surface, the problem of location choice arises, which is also connected with the selection of the proper distance between the poles. On the basis of the performed analysis, it was concluded that the location of collectors in the north-south line is superior to collectors placement in the east-west line. Subsequently, the temperature conditions of work in which is revealed the advantage of this type of collector over flat plate collectors. Additionally, the analysis of temperature work conditions was performed, thanks to which it was possible to compare concentrated solar panels with mirrors and flat plate collectors.