Power, Efficiency and Irreversibility of Latent Energy Systems

Kousksou, T.; Rhafiki, T. El; Arid, A.; Schall, Éric; Zéraouli, Y.

doi:10.2514/1.31227

Cited by 17 publications

(7 citation statements)

References 11 publications

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“…During charging, higher inlet temperature of HTF leads to higher temperature difference between HTF and PCM, which also results in higher entropy generation. This conclusion was proven by Kousksou et al [130] when they analyzed a packed-bed encapsulated PCM storage system. As a result, one may conclude that in order to minimize entropy generation, the HTF inlet temperature should be as close as possible to the melting temperature of PCM.…”

Section: Exergy Analysis Of Lhtes Systemmentioning

confidence: 62%

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Application of phase change materials for thermal energy storage in concentrated solar thermal power plants: A review to recent developments

2015

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h i g h l i g h t sThermal storage for solar thermal power using phase change materials is reviewed. Various phase change materials and manufacturing techniques are surveyed. Mathematical modeling and simulations to latent heat energy storage is reviewed. Integration of a PCM-based TES unit into a power generation system is discussed. Cost analysis of thermocline latent heat thermal storage systems is reviewed. Keywords: Concentrated solar power (CSP) Thermal energy storage (TES) Phase change material (PCM) Latent heat a b s t r a c tThe objective of this paper is to review the recent technologies of thermal energy storage (TES) using phase change materials (PCM) for various applications, particularly concentrated solar thermal power (CSP) generation systems. Five issues of the technology will be discussed based on a survey to the state-of-the-art development and understandings. The first part is about various phase change materials (PCM) in thermal storage applications and recent development of PCM encapsulation technologies. The second is the current status of research and application of latent heat storage systems in CSP plants. The third is the mathematical modeling and numerical simulations to the phenomenon of latent heat thermal storage. The fourth is about the issues of integration of a PCM-based TES unit into a power generation system and the operation. The last part is a discussion about the cost issues and comparison between sensible and latent heat TES systems. The surveyed information will be very helpful to researchers and engineers in energy storage industry and particularly solar thermal power industry.

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Section: Exergy Analysis Of Lhtes Systemmentioning

confidence: 62%

“…According to the conclusions from Kousksou et al [130,132] and Erek and Dincer [131], the difference between inlet and outlet temperatures of HTF decreases as Re number increases. Smaller temperature difference would reduce the entropy transfer due to heat transfer between HTF and PCM.…”

Section: Exergy Analysis Of Lhtes Systemmentioning

confidence: 93%

Application of phase change materials for thermal energy storage in concentrated solar thermal power plants: A review to recent developments

2015

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“…However, this exergy balance reflects only the degraded exergy due to internal irreversibility. In fact, the heat loss or heat gain is the primary parameter of thermal behavior of a storage system and both the energy and exergy efficiencies are dependent on the heat loss or heat gain [68]. Therefore, the heat gain should also be included when evaluating the exergy efficiency of a thermal storage system, i.e., energy transferred by HTF = energy gained by PCM + energy lost to environment and exergy associated with HTF = exergy stored + exergy degraded + exergy lost to environment.…”

Section: ð6:44þmentioning

confidence: 99%

“…With a cycle of charging or discharging process, the net entropy generation (S gen ) can be expressed as [68,[80][81][82]:…”

Section: Generation Of Entropymentioning

confidence: 99%

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Waste Thermal Energy Harvesting (III): Storage with Phase Change Materials

Kong

Hng

et al. 2014

Waste Energy Harvesting

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In last two chapters, both methods to harvest waste thermal energy through the conversion to electricity. In this chapter, energy storage (ES) as an alternative method to harvest waste thermal energy, especially by using phase change materials (PCMs), will be presented.ES, as suggested by the name, is to store a certain form of energy, which thus be used later when necessary. A device that can be used to store any form of energy is generally called an accumulator. There are various forms of energy, commonly including kinetic energy, potential energy (e.g., gravitational or chemical), electrical energy, thermal energy, and so on. All these forms of energy could be stored by using an appropriate method [1,2]. For instance, mechanical energy can be stored by using hydrostorage, compressed air storage, and flywheels, while electrical energy is stored by using various batteries and supercapacitors. Thermal energy storage (TES) is the main content of this chapter.This chapter is arranged as follows. A brief description on various TES conceptions, together with a comparison, will be presented first. Among them, PCMs for TES will be emphasized. After that, PCMs with their classification according to their composition will be discussed. Design criteria, heat transfer phenomena, configuration of various PCM TES systems, which have been reported in open literature, will be summarized. Specific attention will be paid to the exergy analysis. The main applications of the PCM storage systems will be listed, analyzed, and compared. Strategies that have been used to improve the performance of such storage systems will be thoroughly evaluated. It will be ended with concluding remarks and perspectives of development of this technology.

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Assessment of Thermal Energy Storage Systems

Kalaiselvam

Parameshwaran²

2014

Thermal Energy Storage Technologies for Sustainability

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Power, Efficiency and Irreversibility of Latent Energy Systems

Cited by 17 publications

References 11 publications

Application of phase change materials for thermal energy storage in concentrated solar thermal power plants: A review to recent developments

Application of phase change materials for thermal energy storage in concentrated solar thermal power plants: A review to recent developments

Waste Thermal Energy Harvesting (III): Storage with Phase Change Materials

Assessment of Thermal Energy Storage Systems

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