scholarly journals On the Convenience of Using Simulation Models to Optimize the Control Strategy of Molten-Salt Heat Storage Systems in Solar Thermal Power Plants

Energies ◽  
2017 ◽  
Vol 10 (7) ◽  
pp. 990
Author(s):  
Miguel Prieto ◽  
Juan Martínez ◽  
Rogelio Peón ◽  
Lourdes Barcia ◽  
Fernando Nuño
Keyword(s):  
Molten Salt ◽  
Control Strategy ◽  
Power Plants ◽  
Heat Storage ◽  
Storage Systems ◽  
Thermal Power ◽  
Simulation Models ◽  
Solar Thermal ◽  
Thermal Power Plants ◽  
Solar Thermal Power

Latent Heat Storage Systems for Solar Thermal Power Plants and Process Heat Applications

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Wolf-Dieter Steinmann ◽  
Doerte Laing ◽  
Rainer Tamme
Keyword(s):  
Latent Heat ◽  
Power Plants ◽  
Heat Storage ◽  
Storage Systems ◽  
Thermal Power ◽  
Solar Thermal ◽  
Thermal Power Plants ◽  
Latent Heat Storage ◽  
Solar Thermal Power ◽  
Process Heat

Solar thermal systems using absorber evaporating steam directly require isothermal energy storage. The application of latent heat storage systems is an option to fulfill this demand. This concept has been demonstrated mainly for low temperature heating and refrigeration applications, the experience for the power level and temperature range characteristic of solar process heat and solar thermal power plants is limited. Cost effective implementation of the latent heat storage concept demands low cost phase change materials (PCMs). These PCMs usually show low thermal conductivity limiting the power density during the charging/discharging process. This paper describes various approaches, which have been investigated to overcome these limitations. Based on fundamental PCM-research and laboratory-scale experiments, the sandwich concept has been identified to show the highest potential. The sandwich concept has been demonstrated successfully for three different storage units ranging from 2 kW to 100 kW at melting temperatures of 145°C and 225°C.

Methodology for optimized operation strategies of solar thermal power plants with integrated heat storage

Solar Energy ◽  
2011 ◽  
Vol 85 (4) ◽  
pp. 653-659 ◽  
Author(s):  
Michael Wittmann ◽  
Markus Eck ◽  
Robert Pitz-Paal ◽  
Hans Müller-Steinhagen
Keyword(s):  
Power Plants ◽  
Heat Storage ◽  
Thermal Power ◽  
Solar Thermal ◽  
Thermal Power Plants ◽  
Solar Thermal Power

Screening and Analysis of Potential Filler Materials for Molten Salt Thermocline Storages

2014 ◽  
Author(s):  
Claudia Martin ◽  
Nils Breidenbach ◽  
Markus Eck
Keyword(s):  
Thermal Stability ◽  
Molten Salt ◽  
Electricity Generation ◽  
Power Plants ◽  
Low Cost ◽  
Thermal Power ◽  
Solar Thermal ◽  
Filler Materials ◽  
Thermal Power Plants ◽  
Solar Thermal Power

Solar thermal power plants are a promising option for future solar electricity generation. Their main advantage is the possibility to utilize integrated thermal storage capacities, allowing electricity generation on demand. In state of the art solar thermal power plants, two-tank molten-salt thermal energy storages are used. Significant cost reductions are expected by using thermocline thermal energy storage by storing the liquid storage material inside a single tank when compared to a two tank storage system. By embedding a low cost solid filler material inside the storage tank further cost reductions can be achieved. In earlier studies [1, 2] several potential filler materials have been investigated. In these study quartzite turned out to be a promising candidate due to its satisfying thermal stability and availability. At a temperature of approx. 573°C the crystal structure of quartzite changes from trigonal α-quartz phase to the hexagonal β-quartz phase [3]. This quartz conversion results in a volume change [4] that may cause cracking of the quartzite crystals due to weight loads in a packed bed. Since these thermal tests of the study mentioned were limited to 500°C this dunting was not considered. Thus, despite of the published studies there is a need for further, more detailed analysis. One trend in today’s development of solar thermal power plants is to use molten salt as storage material and heat transfer fluid at operating temperatures of 560°C and above. Accordingly, the quartz inversion might limit the applicability of quartzite as a filler material at elevated operating temperatures. Due to this concern, an investigation has been started to investigate the utilizability of natural rocks as low cost filler materials. In the first phase of this investigation a comprehensive literature survey was conducted. Based on this study, magmatic and sedimentary rocks turned out to the most promising rock classes for this application. For the further investigation, basalt was chosen as a suited representative for magmatic and quartzite for sedimentary rocks. In lab-scale tests, these candidate materials were investigated with respect to their: • Calcite content • Thermal stability up to 900°C in air • Thermal stability up to 560°C in molten salt • Cyclic stability between 290°C and 560°C in molten salt • Specific heat capacity up to 600°C In this paper the results of these investigations are presented and future activities are outlined.

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