Abstract
Thermal oil is used as a heat transfer fluid in many thermal solar power systems, while molten salts are used to store thermal energy. The oil absorbs solar energy and transports it to a water-steam cycle via heat exchangers, where it is transformed into electric energy via a turbo-generator or stored in a thermal energy storage device for subsequent transmission to the water-steam cycle. The complexity of these thermal solar plants is rather significant, as they mix conventional engineering used in power stations (water-steam cycle) or petrochemical (oil pipeline) with modern solar (parabolic trough collector) and heat storage (molten salts) technology. This paper focuses on modelling in heat exchanger tubes in molten salt energy storage systems, and it offers a comprehensive model of the process. By developing such a model, the groundwork for future study into heat exchangers model failure analysis is established.
Highlights
The heat exchanger in concentrated solar power (CSP) facilities has developed into one of the most developed and researched technologies in the world
The indirect two-tank molten salt thermal energy storage TES system is the most common TES technology used in this type of concentrated solar power CSP facility [9]
This comprises of two storage tanks filled with molten salt in which the energy is stored in a perceptible form [10]
Summary
The heat exchanger in concentrated solar power (CSP) facilities has developed into one of the most developed and researched technologies in the world. The two-tank molten salts system has been theoretically investigated by detailing the best practices during design, start up, and operation in technology projects facilities [11] These studies demonstrated the value and use of constructing pilot plant facilities in a scale range between the laboratory and ultimate CSP plants in order to obtain greater cost reductions in actual CSP plants They found that a 12-hour storage system at full load capacity decreased the levelled power cost by around 10% [12]. The findings revealed that there was no temperature categorization in the storage tank, and that the radial heat transfer was primarily caused by the insulating material, the type of electrical resistance used for molten salts temperature regulation, the perspective of the storage tanks, and the operating conditions [1315] The objective of this present paper is to analysing the degradation of the materials of heat exchanger in thermal storage energy systems in the charging and discharging process using molten salt. The authors utilized a two-tank molten salt pilot plant to conduct the experiment [18]
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