A Comparative Study of High-Temperature Latent Heat Storage Systems

High-temperature latent heat storage (LHS) systems using a high-temperature phase change medium (PCM) could be a potential solution for providing dispatchable energy from concentrated solar power (CSP) systems and for storing surplus energy from photovoltaic and wind power. In addition, ultra-high-t...

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Autores principales:	Alok Kumar Ray, Dibakar Rakshit, K. Ravi Kumar, Hal Gurgenci
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	renewable energy high-temperature LHS thermo-fluidic liquid/solid fraction energy storage density Technology T
Acceso en línea:	https://doaj.org/article/04450be1a02d4432bf7a6114be9a9c7f
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spelling	oai:doaj.org-article:04450be1a02d4432bf7a6114be9a9c7f2021-11-11T15:43:59ZA Comparative Study of High-Temperature Latent Heat Storage Systems10.3390/en142168861996-1073https://doaj.org/article/04450be1a02d4432bf7a6114be9a9c7f2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/6886https://doaj.org/toc/1996-1073High-temperature latent heat storage (LHS) systems using a high-temperature phase change medium (PCM) could be a potential solution for providing dispatchable energy from concentrated solar power (CSP) systems and for storing surplus energy from photovoltaic and wind power. In addition, ultra-high-temperature (>900 °C) latent heat storage (LHS) can provide significant energy storage density and can convert thermal energy to both heat and electric power efficiently. In this context, a 2D heat transfer analysis is performed to capture the thermo-fluidic behavior during melting and solidification of ultra-high-temperature silicon in rectangular domains for different aspect ratios (AR) and heat flux. Fixed domain effective heat capacity formulation has been deployed to numerically model the phase change process using the finite element method (FEM)-based COMSOL Multiphysics. The influence of orientation of geometry and heat flux magnitude on charging and discharge performance has been evaluated. The charging efficiency of the silicon domain is found to decrease with the increase in heat flux. The charging performance of the silicon domain is compared with high-temperature LHS domain containing state of the art salt-based PCM (NaNO<sub>3</sub>) for aspect ratio (AR) = 1. The charging rate of the NaNO<sub>3</sub> domain is observed to be significantly higher compared to the silicon domain of AR = 1, despite having lower thermal diffusivity. However, energy storage density (J/kg) and energy storage rate (J/kgs) for the silicon domain are 1.83 and 2 times more than they are for the NaNO<sub>3</sub> domain, respectively, after 3.5 h. An unconventional counterclockwise circular flow is observed in molten silicon, whereas a clockwise circular flow is observed in molten NaNO<sub>3</sub> during charging. The present study establishes silicon as a potential PCM for designing an ultra-high-temperature LHS system.Alok Kumar RayDibakar RakshitK. Ravi KumarHal GurgenciMDPI AGarticlerenewable energyhigh-temperatureLHSthermo-fluidicliquid/solid fractionenergy storage densityTechnologyTENEnergies, Vol 14, Iss 6886, p 6886 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	renewable energy high-temperature LHS thermo-fluidic liquid/solid fraction energy storage density Technology T
spellingShingle	renewable energy high-temperature LHS thermo-fluidic liquid/solid fraction energy storage density Technology T Alok Kumar Ray Dibakar Rakshit K. Ravi Kumar Hal Gurgenci A Comparative Study of High-Temperature Latent Heat Storage Systems
description	High-temperature latent heat storage (LHS) systems using a high-temperature phase change medium (PCM) could be a potential solution for providing dispatchable energy from concentrated solar power (CSP) systems and for storing surplus energy from photovoltaic and wind power. In addition, ultra-high-temperature (>900 °C) latent heat storage (LHS) can provide significant energy storage density and can convert thermal energy to both heat and electric power efficiently. In this context, a 2D heat transfer analysis is performed to capture the thermo-fluidic behavior during melting and solidification of ultra-high-temperature silicon in rectangular domains for different aspect ratios (AR) and heat flux. Fixed domain effective heat capacity formulation has been deployed to numerically model the phase change process using the finite element method (FEM)-based COMSOL Multiphysics. The influence of orientation of geometry and heat flux magnitude on charging and discharge performance has been evaluated. The charging efficiency of the silicon domain is found to decrease with the increase in heat flux. The charging performance of the silicon domain is compared with high-temperature LHS domain containing state of the art salt-based PCM (NaNO<sub>3</sub>) for aspect ratio (AR) = 1. The charging rate of the NaNO<sub>3</sub> domain is observed to be significantly higher compared to the silicon domain of AR = 1, despite having lower thermal diffusivity. However, energy storage density (J/kg) and energy storage rate (J/kgs) for the silicon domain are 1.83 and 2 times more than they are for the NaNO<sub>3</sub> domain, respectively, after 3.5 h. An unconventional counterclockwise circular flow is observed in molten silicon, whereas a clockwise circular flow is observed in molten NaNO<sub>3</sub> during charging. The present study establishes silicon as a potential PCM for designing an ultra-high-temperature LHS system.
format	article
author	Alok Kumar Ray Dibakar Rakshit K. Ravi Kumar Hal Gurgenci
author_facet	Alok Kumar Ray Dibakar Rakshit K. Ravi Kumar Hal Gurgenci
author_sort	Alok Kumar Ray
title	A Comparative Study of High-Temperature Latent Heat Storage Systems
title_short	A Comparative Study of High-Temperature Latent Heat Storage Systems
title_full	A Comparative Study of High-Temperature Latent Heat Storage Systems
title_fullStr	A Comparative Study of High-Temperature Latent Heat Storage Systems
title_full_unstemmed	A Comparative Study of High-Temperature Latent Heat Storage Systems
title_sort	comparative study of high-temperature latent heat storage systems
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/04450be1a02d4432bf7a6114be9a9c7f
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A Comparative Study of High-Temperature Latent Heat Storage Systems

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