A Redesign Methodology to Improve the Performance of a Thermal Energy Storage with Phase Change Materials: A Numerical Approach

Itamar A. Harris Bernal, Arthur M. James Rivas, María De Los A. Ortega Del Rosario and M. Ziad Saghir
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Itamar A. Harris Bernal: Department of Mechanical Engineering, Universidad Tecnológica de Panamá, El Dorado, Ciudad de Panamá 0819-07289, Panama
Arthur M. James Rivas: Department of Mechanical Engineering, Universidad Tecnológica de Panamá, El Dorado, Ciudad de Panamá 0819-07289, Panama
María De Los A. Ortega Del Rosario: Department of Mechanical Engineering, Universidad Tecnológica de Panamá, El Dorado, Ciudad de Panamá 0819-07289, Panama
M. Ziad Saghir: Mechanical and Industrial Engineering Department, Ryerson University, Toronto, ON M5B 2K3, Canada

Energies, 2022, vol. 15, issue 3, 1-23

Abstract: In recent years, phase change materials (PCMs) have been presented as a suitable alternative for thermal energy storage (TES) systems for solar water heater (SWH) applications. However, PCMs’ low thermal conductivity and the high dependence on external conditions are the main challenges during the design of TES systems with PCMs. Design actions to improve the performance of the TES systems are crucial to achieve the necessary stored/released thermal energy and guarantee the all-day operation of SWHs under specific system requirements. In this study, a TES with PCM in the configuration of a heat exchanger was redesigned, focused on achieving two main targets: an outlet water temperature over 43 °C during discharging time (15 h) and efficiency over 60% to supply the hot water demand of two families (400 L). A four-step redesign methodology was proposed and implemented through numerical simulations to address this aim. It was concluded that the type, encapsulation shape, and amount of PCM slightly impacted the system’s performance; however, selecting a suitable sensible heat storage material had the highest impact on meeting the system’s targets. The redesigned TES reached 15 operating hours with a minimum outlet water temperature of 45.30 °C and efficiency of 76.08%.

Keywords: solar water heater; thermal energy storage; phase change materials; redesign methodology; numerical simulations; sensitivity analysis; performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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