Analysis of exergetic efficiency in the storage of solar thermal energy in phase change materials (PCMs)

  1. Marcos Luján Pérez
Journal:
Acta Nova

ISSN: 1683-0768

Year of publication: 2024

Volume: 11

Issue: 3

Pages: 304-317

Type: Article

DOI: 10.35319/ACTA-NOVA.202421 DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Acta Nova

Abstract

Abstract: Renewable energy generation systems in most cases require exergy storage systems to reconcile the differences between renewable energy supply and energy demand. For this it is necessary to have exergy storage systems (not just energy), the efficiency of these systems is very important for the competitiveness of renewable energies. This work analyzes the efficiency of thermal exergy storage systems applied to solar energy use systems through CSP (Concentrated Solar Power) systems. The theoretical analysis shows that the efficiency of exergy storage depends essentially on the temperatures and the temperature differences between the source of thermal energy loading and the source of thermal energy discharge. It is also evident that the closer the system is of the ambient temperature, the lower its efficiency will be until it is practically zero, around ambient temperature. The basic strategy to reduce losses in heat transfer processes for exergy storage is to reduce the temperature difference between the elements that exchange heat. With this criterion, a heat storage system is proposed with PCM at high temperature, the maximum possible, and a combined Bryton and Rankine cycle system that would improve the efficiency of solar exergy capture in a CSP system.

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