Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material

This study introduces a novel latent heat storage system using a combination of active (fins and nanoparticles) and passive (conical design) heat transfer enhancement techniques for the solar absorption chilling system. First part of the work proposes a selection criterion using Multi-attribute deci...

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Main Authors: Singh, Rupinder Pal, Xu, Haoxin, Kaushik, Shubhash Chandra, Rakshit, Dibakar, Romagnoli, Alessandro
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/150282
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1502822021-06-10T02:36:43Z Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material Singh, Rupinder Pal Xu, Haoxin Kaushik, Shubhash Chandra Rakshit, Dibakar Romagnoli, Alessandro School of Mechanical and Aerospace Engineering Energy Research Institute @ NTU (ERI@N) Engineering::Mechanical engineering Charging Performance Evaluation Latent Heat Storage System This study introduces a novel latent heat storage system using a combination of active (fins and nanoparticles) and passive (conical design) heat transfer enhancement techniques for the solar absorption chilling system. First part of the work proposes a selection criterion using Multi-attribute decision making (MADM) combined with Multi objectives decision making (MODM) tools to rank and select the different nanoparticles. The methodology suggests Graphene as the best candidate amongst the widely used metal (Cu, Al, Ni, Ag) and metal oxide (CuO, Al₂ O₃ , TiO₂ , SiO₂) nanoparticles. Subsequently, the charging performance of the medium temperature eutectic salt (LiNO₃ -KCl; 50:50) dispersed with graphene nanoplates is studied in a conical shaped shell and tube storage system with & without fins. The numerical investigations are performed using the actual plant data of double effect solar absorption system. Based on the plant operating conditions, the Stefan and Grashoff numbers are obtained as 0.35 & 4.2 × 10⁵ respectively, showing the laminar flow of molten PCM. The thermal performance of the storage system coupled with heat transfer and fluid flow is studied for melt fraction, temperature field, the energy stored and heat flux variations at different concentration of graphene. Effect of enhanced viscosity and reduction in natural convection heat transfer due to GNP dispersion is studied simultaneously with the gained advantage of increased thermal conductivity. It is concluded that melting time is reduced by 57% using the proposed storage design in comparison with a conventional cylindrical system. Nanyang Technological University The authors would like to thank the collaboration between NTU (Nanyang Technological University) Singapore & IIT Delhi (Indian Institute of Technology). The Ph.D. exchange programme is supported by Energy Research Institute@ NTU (Nanyang Technological University), Singapore. The author (Rupinder Pal Singh) acknowledges Punjab Agricultural University, India for granting study leave and QIP, IIT Delhi for providing a platform to carry out the research work. 2021-06-10T02:36:43Z 2021-06-10T02:36:43Z 2019 Journal Article Singh, R. P., Xu, H., Kaushik, S. C., Rakshit, D. & Romagnoli, A. (2019). Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material. Applied Thermal Engineering, 151, 176-190. https://dx.doi.org/10.1016/j.applthermaleng.2019.01.072 1359-4311 0000-0003-1271-5479 https://hdl.handle.net/10356/150282 10.1016/j.applthermaleng.2019.01.072 2-s2.0-85061039327 151 176 190 en Applied Thermal Engineering © 2019 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Charging Performance Evaluation
Latent Heat Storage System
spellingShingle Engineering::Mechanical engineering
Charging Performance Evaluation
Latent Heat Storage System
Singh, Rupinder Pal
Xu, Haoxin
Kaushik, Shubhash Chandra
Rakshit, Dibakar
Romagnoli, Alessandro
Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material
description This study introduces a novel latent heat storage system using a combination of active (fins and nanoparticles) and passive (conical design) heat transfer enhancement techniques for the solar absorption chilling system. First part of the work proposes a selection criterion using Multi-attribute decision making (MADM) combined with Multi objectives decision making (MODM) tools to rank and select the different nanoparticles. The methodology suggests Graphene as the best candidate amongst the widely used metal (Cu, Al, Ni, Ag) and metal oxide (CuO, Al₂ O₃ , TiO₂ , SiO₂) nanoparticles. Subsequently, the charging performance of the medium temperature eutectic salt (LiNO₃ -KCl; 50:50) dispersed with graphene nanoplates is studied in a conical shaped shell and tube storage system with & without fins. The numerical investigations are performed using the actual plant data of double effect solar absorption system. Based on the plant operating conditions, the Stefan and Grashoff numbers are obtained as 0.35 & 4.2 × 10⁵ respectively, showing the laminar flow of molten PCM. The thermal performance of the storage system coupled with heat transfer and fluid flow is studied for melt fraction, temperature field, the energy stored and heat flux variations at different concentration of graphene. Effect of enhanced viscosity and reduction in natural convection heat transfer due to GNP dispersion is studied simultaneously with the gained advantage of increased thermal conductivity. It is concluded that melting time is reduced by 57% using the proposed storage design in comparison with a conventional cylindrical system.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Singh, Rupinder Pal
Xu, Haoxin
Kaushik, Shubhash Chandra
Rakshit, Dibakar
Romagnoli, Alessandro
format Article
author Singh, Rupinder Pal
Xu, Haoxin
Kaushik, Shubhash Chandra
Rakshit, Dibakar
Romagnoli, Alessandro
author_sort Singh, Rupinder Pal
title Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material
title_short Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material
title_full Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material
title_fullStr Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material
title_full_unstemmed Charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material
title_sort charging performance evaluation of finned conical thermal storage system encapsulated with nano-enhanced phase change material
publishDate 2021
url https://hdl.handle.net/10356/150282
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