scholarly journals Heat transfer enhancement in phase change materials for thermal energy storage in concentrated solar power plants

2020 ◽  
Author(s):  
Michael Opolot ◽  
Chunrong Zhao ◽  
Kamel Hooman
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Power Plants ◽  
Phase Change Materials ◽  
Concentrated Solar Power ◽  
Transfer Enhancement ◽  
Solar Power Plants ◽  
Concentrated Solar Power Plants

New Thermal Energy Storage Materials From Industrial Wastes: Compatibility of Steel Slags With the Most Common Heat Transfer Fluids

2014 ◽  
Author(s):  
Iñigo Ortega ◽  
Javier Rodríguez-Aseguinolaza ◽  
Antoni Gil ◽  
Abdessamad Faik ◽  
Bruno D’Aguanno
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Power Plants ◽  
Concentrated Solar Power ◽  
Iron And Steel ◽  
Heat Transfer Fluids ◽  
Solar Power Plants ◽  
Concentrated Solar Power Plants

Slag is one of the main waste materials of the iron and steel manufacturing. Every year about 20 million tons of slag are generated in the United States and 43.5 million tons in Europe. The revalorization of this by-product as heat storage material in thermal energy storage systems would have numerous advantages which include: the possibility to extend the working temperature range up to 1000 °C, the reduction of the system cost and, at the same time, the decrease of the quantity of waste in the iron and steel industry. In this paper, two different electric arc furnace slags from two companies located in the Basque Country (Spain) are studied. Their thermal stability and compatibility in direct contact with the most common heat transfer fluids used in the concentrated solar power plants are analyzed. The experiments have been designed in order to cover a wide temperature range up to the maximum operation temperature of the future generation of concentrated solar power plants (1000 °C). In particular, three different fluids have been studied: synthetic oil (Syltherm 800®) at 400 °C, molten salt (Solar Salt) at 500 °C and air at 1000 °C. In addition, a complete characterization of the studied slags and fluids used in the experiments is presented showing the behavior of these materials after 500 hour laboratory-tests.

A Review of Latent Heat Thermal Energy Storage for Concentrated Solar Plants onthe Grid

2015 ◽  
Vol 8 (1) ◽  
Author(s):  
E. Flores
Keyword(s):  
Energy Storage ◽  
Latent Heat ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Power Plants ◽  
Concentrated Solar Power ◽  
Renewable Source ◽  
Solar Power Plants ◽  
Reducing Costs ◽  
Concentrated Solar Power Plants

Thermal Energy Storage has improved the dispatch ability of Concentrated Solar Power Plants(CSP), a renewable source of energy on the grid. Furthermore, Latent heat Thermal Energy Storage(LTES)shows potential as a storage technology by further reducing costs and improving eciencyfor CSP plants. This papers reviews the goals for LTES, the developments in phase change materialsfor LTES, the types of system congurations possible, and the challenges that LTES face. Fromthe scientic literature available, LTES systems can meet TES goals, and research is progressing inmaking it a scalable technology for CSP plants.

scholarly journals REVIEW AND EVALUATION OF NANOFLUIDS AS PROSPECT THERMAL ENERGY STORAGE MATERIAL FOR CONCENTRATED SOLAR POWER APPLICATION

2020 ◽  
pp. 10-29
Author(s):  
C.L. Majadas ◽  
J.M. Peñaloga ◽  
R.W. Salvador
Keyword(s):  
Thermal Conductivity ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Power Plants ◽  
Solar Power ◽  
Concentrated Solar Power ◽  
Solar Power Plants ◽  
Thermal Energy Storage Systems ◽  
Concentrated Solar Power Plants

Solar energy intermittency is one of the main challenges encountered by thermal energy storage systems in concentrated solar power plants due to the low heat transfer rates during charging operations. The critical thermophysical property to be considered for combating this problem is the thermal conductivity. Thus, base fluids with dispersed nanoparticles, better known as nanofluids, have become materials with great potential since they enhance efficiency during charging intervals by increasing the charged material's thermal conductivity by up to 89 %. By gathering and analyzing results from various studies in nanofluids, it was observed that there is a considerable improvement in the thermal storage material compared with the base fluid alone. There is also an increase in the thermal conductivity as nanoparticles are added. Obtaining an increase as great as 99 % allows faster rates of heat transfer. Overall, this may significantly improve the efficiency of thermal energy storage systems in concentrated solar power plants.

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