Preparation of Au nanoparticles in a non-polar medium: obtaining high-efficiency nanofluids for concentrating solar power. An experimental and theoretical perspective

2017 ◽  
Vol 5 (24) ◽  
pp. 12483-12497 ◽  
Author(s):  
Roberto Gómez-Villarejo ◽  
Javier Navas ◽  
Elisa I. Martín ◽  
Antonio Sánchez-Coronilla ◽  
Teresa Aguilar ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Au Nanoparticles ◽  
High Efficiency ◽  
Solar Power ◽  
Theoretical Perspective ◽  
Concentrating Solar Power ◽  
Polar Medium

Au nanofluids with enhanced thermal properties for use in CSP.

Insights into the stability and thermal properties of WSe2-based nanofluids for concentrating solar power prepared by liquid phase exfoliation

2020 ◽  
Vol 319 ◽  
pp. 114333
Author(s):  
Paloma Martínez-Merino ◽  
Antonio Sánchez-Coronilla ◽  
Rodrigo Alcántara ◽  
Elisa I. Martín ◽  
Javier Navas
Keyword(s):  
Thermal Properties ◽  
Liquid Phase ◽  
Solar Power ◽  
Concentrating Solar Power ◽  
Liquid Phase Exfoliation ◽  
The Stability

Thermodynamic Study of Advanced Supercritical Carbon Dioxide Power Cycles for High Performance Concentrating Solar Power Systems

2012 ◽  
Author(s):  
Craig S. Turchi ◽  
Zhiwen Ma ◽  
Ty Neises ◽  
Michael Wagner
Keyword(s):  
Power Systems ◽  
High Performance ◽  
High Efficiency ◽  
Solar Power ◽  
Thermal Power ◽  
Department Of Energy ◽  
Thermal Mass ◽  
Brayton Cycle ◽  
Concentrating Solar Power ◽  
Compact Size

In 2011, the U.S. Department of Energy (DOE) initiated a “SunShot Concentrating Solar Power R&D” program to develop technologies that have the potential for much higher efficiency, lower cost, and/or more reliable performance than existing CSP systems. The DOE seeks to develop highly disruptive Concentrating Solar Power (CSP) technologies that will meet 6¢/kWh cost targets by the end of the decade, and a high-efficiency, low-cost thermal power cycle is one of the important components to achieve the goal. Supercritical CO2 (s-CO2) operated in a closed-loop Brayton cycle offers the potential of equivalent or higher cycle efficiency versus superheated or supercritical steam cycles at temperatures relevant for CSP applications. Brayton-cycle systems using s-CO2 have a smaller weight and volume, lower thermal mass, and less complex power blocks versus Rankine cycles due to the higher density of the fluid and simpler cycle design. The simpler machinery and compact size of the s-CO2 process may also reduce the installation, maintenance and operation cost of the system.

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.

scholarly journals Analysis of a Fluidized-Bed Particle/Supercritical-CO2 Heat Exchanger in a Concentrating Solar Power System

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Zhiwen Ma ◽  
Janna Martinek
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Exchanger ◽  
Fluidized Bed ◽  
High Efficiency ◽  
Solar Power ◽  
Concentrating Solar Power ◽  
Power Cycle ◽  
Temperature Heat ◽  
The Cost

Abstract Concentrating solar power (CSP) development has focused on increasing the energy conversion efficiency and lowering the capital cost. To improve performance, CSP research is moving to high-temperature and high-efficiency designs. One technology approach is to use inexpensive, high-temperature heat transfer fluids and storage, integrated with a high-efficiency power cycle such as the supercritical carbon dioxide (sCO2) Brayton power cycle. The sCO2 Brayton power cycle has strong potential to achieve performance targets of 50% thermal-to-electric efficiency and dry cooling at an ambient temperature of up to 40 °C and to reduce the cost of power generation. Solid particles have been proposed as a possible high-temperature heat transfer or storage medium that is inexpensive and stable at high temperatures above 1000 °C. The particle/sCO2 heat exchanger (HX) provides a connection between the particles and sCO2 fluid in emerging sCO2 power cycles. This article presents heat transfer modeling to analyze the particle/sCO2 HX design and assess design tradeoffs including the HX cost. The heat transfer process was modeled based on a particle/sCO2 counterflow configuration, and empirical heat transfer correlations for the fluidized bed and sCO2 were used to calculate heat transfer area and estimate the HX cost. A computational fluid dynamics simulation was applied to characterize particle distribution and fluidization. This article shows a path to achieve the cost and performance objectives for a particle/sCO2 HX design by using fluidized-bed technology.

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