scholarly journals The Role of the Interactions at the Tungsten Disulphide Surface in the Stability and Enhanced Thermal Properties of Nanofluids with Application in Solar Thermal Energy

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 970 ◽  
Author(s):  
Paloma Martínez-Merino ◽  
Antonio Sánchez-Coronilla ◽  
Rodrigo Alcántara ◽  
Elisa I. Martín ◽  
Iván Carrillo-Berdugo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Density Functional ◽  
Power Plants ◽  
Solar Power ◽  
Intermolecular Forces ◽  
Hydroxyl Group ◽  
Concentrating Solar Power ◽  
Solar Power Plants ◽  
The Stability

Transition metal dichalcogenides (TMCs) exhibit unique properties that make them of interest for catalysis, sensing or energy storage applications. However, few studies have been performed into nanofluids based on TMCs for heat transfer applications. In this study, nanofluids based on 2D-WS2 are prepared by liquid phase exfoliation to analyze their potential usage in concentrating solar power plants. Periodic-Density Functional Theory (DFT) calculations were performed to rationalize the success of the exfoliation process. The hydrogen bond interaction between the hydroxyl group from PEG, which acts as a surfactant, and the S atoms of the WS2 surface stabilizes the nanosheets in the fluid. Electron localization function (ELF) analysis is indicative of the stability of the S–H interaction from WS2 with the molecules of surfactant due to the tendency to interact through weak intermolecular forces of van der Waals solids. Moreover, improvements in thermal properties were also found. Isobaric specific heat increased by up to 10% and thermal conductivity improved by up to 37.3%. The high stability of the nanofluids and the thermal improvements were associated with the high surface area of WS2 nanosheets. These results suggest that these nanofluids could be a promising heat transfer fluid in concentrating solar power plants.

Dramatically enhanced thermal properties for TiO2-based nanofluids for being used as heat transfer fluids in concentrating solar power plants

2018 ◽  
Vol 119 ◽  
pp. 809-819 ◽  
Author(s):  
Andrey Yasinskiy ◽  
Javier Navas ◽  
Teresa Aguilar ◽  
Rodrigo Alcántara ◽  
Juan Jesús Gallardo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Power Plants ◽  
Solar Power ◽  
Concentrating Solar Power ◽  
Heat Transfer Fluids ◽  
Solar Power Plants

Streamlining the Power Generation Profile of Concentrating Solar Power Plants

2018 ◽  
Author(s):  
Mohammad Abutayeh ◽  
Anas Alazzam ◽  
Bashar El-Khasawneh
Keyword(s):  
Heat Transfer ◽  
Power Generation ◽  
Power Plants ◽  
Solar Power ◽  
Heat Transfer Fluid ◽  
Concentrating Solar Power ◽  
Transfer Rates ◽  
Power Block ◽  
Solar Power Plants ◽  
Solar Field

A scheme to streamline the electric power generation profile of concentrating solar power plants of the parabolic trough collector type is suggested. The scheme seeks to even out heat transfer rates from the solar field to the power block by splitting the typical heat transfer fluid loop into two loops using an extra vessel and an extra pump. In the first loop, cold heat transfer fluid is pumped by the cold pump from the cold vessel to the solar field to collect heat before accumulating in the newly introduced hot vessel. In the second loop, hot heat transfer fluid is pumped by the hot pump from the hot vessel to a heat exchanger train to supply the power block with its heat load before accumulating in the cold vessel. The new scheme moderately decouples heat supply from heat sink allowing for more control of heat delivery rates thereby evening out power generation.

HEAT TRANSFER STUDY IN A VOLUMETRIC RECEIVER USED IN CONCENTRATING SOLAR POWER PLANTS

2016 ◽  
Author(s):  
Taísa Santos Da Silva ◽  
Paulo Mohallem Guimarães ◽  
Fábio Santos Nascimento ◽  
Genésio Menon ◽  
Gabriel Araujo
Keyword(s):  
Heat Transfer ◽  
Power Plants ◽  
Solar Power ◽  
Concentrating Solar Power ◽  
Solar Power Plants ◽  
Transfer Study

Streamlining the Power Generation Profile of Concentrating Solar Power Plants

2019 ◽  
Vol 141 (2) ◽  
Author(s):  
Mohammad Abutayeh ◽  
Kwangkook Jeong ◽  
Anas Alazzam ◽  
Bashar El-Khasawneh
Keyword(s):  
Heat Transfer ◽  
Power Generation ◽  
Power Plants ◽  
Solar Power ◽  
Heat Transfer Fluid ◽  
Concentrating Solar Power ◽  
Transfer Rates ◽  
Power Block ◽  
Solar Power Plants ◽  
Solar Field

A scheme to streamline the electric power generation profile of concentrating solar power (CSP) plants of the parabolic trough collector (PTC) type is suggested. The scheme seeks to even out heat transfer rates from the solar field (SF) to the power block (PB) by splitting the typical heat transfer fluid (HTF) loop into two loops using an extra vessel and an extra pump. In the first loop, cold HTF is pumped by the cold pump from the cold vessel to the SF to collect heat before accumulating in the newly introduced hot vessel. In the second loop, hot HTF is pumped by the hot pump from the hot vessel to a heat exchanger train (HXT) to supply the PB with its heat load before accumulating in the cold vessel. The new scheme moderately decouples heat supply from heat sink allowing for more control of heat delivery rates thereby evening out power generation.

Unraveling the role of the base fluid arrangement in metal-nanofluids used to enhance heat transfer in concentrating solar power plants

2018 ◽  
Vol 252 ◽  
pp. 271-278 ◽  
Author(s):  
Elisa I. Martín ◽  
Antonio Sánchez-Coronilla ◽  
Javier Navas ◽  
Roberto Gómez-Villarejo ◽  
Juan Jesús Gallardo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Base Fluid ◽  
Power Plants ◽  
Solar Power ◽  
Concentrating Solar Power ◽  
Enhance Heat Transfer ◽  
Solar Power Plants

scholarly journals A Review of Conventional and Innovative- Sustainable Methods for Cleaning Reflectors in Concentrating Solar Power Plants

2018 ◽  
Vol 10 (11) ◽  
pp. 3937 ◽  
Author(s):  
Sahar Bouaddi ◽  
Aránzazu Fernández-García ◽  
Chris Sansom ◽  
Jon Sarasua ◽  
Fabian Wolfertstetter ◽  
...  
Keyword(s):  
Power Plants ◽  
Solar Power ◽  
Alternative Methods ◽  
Concentrating Solar Power ◽  
Water Based ◽  
Solar Power Plants ◽  
Cleaning Methods ◽  
The Cost ◽  
Solar Field ◽  
High Reflectance

The severe soiling of reflectors deployed in arid and semi arid locations decreases their reflectance and drives down the yield of the concentrating solar power (CSP) plants. To alleviate this issue, various sets of methods are available. The operation and maintenance (O&M) staff should opt for sustainable cleaning methods that are safe and environmentally friendly. To restore high reflectance, the cleaning vehicles of CSP plants must adapt to the constraints of each technology and to the layout of reflectors in the solar field. Water based methods are currently the most commonly used in CSP plants but they are not sustainable due to water scarcity and high soiling rates. The recovery and reuse of washing water can compensate for these methods and make them a more reasonable option for mediterranean and desert environments. Dry methods, on the other hand, are gaining more attraction as they are more suitable for desert regions. Some of these methods rely on ultrasonic wave or vibration for detaching the dust bonding from the reflectors surface, while other methods, known as preventive methods, focus on reducing the soiling by modifying the reflectors surface and incorporating self cleaning features using special coatings. Since the CSP plants operators aim to achieve the highest profit by minimizing the cost of cleaning while maintaining a high reflectance, optimizing the cleaning parameters and strategies is of great interest. This work presents the conventional water-based methods that are currently used in CSP plants in addition to sustainable alternative methods for dust removal and soiling prevention. Also, the cleaning effectiveness, the environmental impacts and the economic aspects of each technology are discussed.

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