scholarly journals Evaluation and Improvement of PCM Melting in Double Tube Heat Exchangers Using Different Combinations of Nanoparticles and PCM (The Case of Renewable Energy Systems)

2021 ◽  
Vol 13 (19) ◽  
pp. 10675
Author(s):  
Ali Motevali ◽  
Mohammadreza Hasandust Rostami ◽  
Gholamhassan Najafi ◽  
Wei-Mon Yan
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Exchangers ◽  
Storage System ◽  
Melting Process ◽  
Energy Storage System ◽  
Melting Rate ◽  
Thermal Energy Storage System ◽  
Dispersion Of Nanoparticles

In this work, the melting process of phase change material (PCM) in double tube heat exchangers was investigated and evaluated through the use of different combinations (1, 2, 3% Nano-Enhanced PCM and 1, 3, 5% Nano-HTF) of GQD, as well as SWCNT nanoparticles and PCM (RT82). In this study, the effect of three different methods, namely the dispersion of nanoparticles in PCM (nano-enhanced PCM), the dispersion of nanoparticles in HTF (nano-HTF), and the simultaneous dispersion of nanoparticles in PCM and HTF (nano-enhanced PCM, nano-HTF) concerning the nanoparticles participation in the thermal energy storage system in a double tube heat exchanger was evaluated. Other effective factors, such as the inlet fluid temperature, different Reynolds numbers, fin as well as new parameter of pipe, and fin thickness were also evaluated. The results showed that the highest effect of different parameters on the PCM melting process was related to the 1% nano-HTF and 3% nano-enhanced PCM nanoparticles of SWCNT, which decreased the PCM melting rate by about 39%. The evaluation of the effect of pipe and fan thickness also showed that the melting rate improved by 31% through reducing the thickness of the HTF fin and pipe. In general, the current study followed two purposes first, to examine three methods of the dispersion of nanoparticles in the thermal energy storage system; second, to reduce the thickness of the tube and fin. Findings of the study yielded positive results.

Melting Rate Analysis for Optimization of Fin Configuration in PCM Based Thermal Energy Storage System

2020 ◽  
Vol 78 (2) ◽  
pp. 34-46
Author(s):  
Natteri Mangadu Sudharsan
Keyword(s):  
Energy Storage ◽  
Thermal Comfort ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Initial Phase ◽  
Liquid Fraction ◽  
Storage System ◽  
Energy Storage System ◽  
Melting Rate ◽  
Thermal Energy Storage System

The increase in the energy demands and a higher peak hour electricity tariff makes thermal comfort management of buildings more expensive and critical. Thermal comfort at an optimum cost requires management of building heat load. This leads to the use of Phase Change Materials (PCM) for thermal energy storage system (TESS). The process varies with fin length, position and numbers. The process is complicated requiring either numerical or experimental modelling. Data analysis with statistical methods to understand the melting process under various fin configurations is presented here. Result from open literature has been extracted and equations for liquid fraction are generated using polynomial regression modelling. Melting rate is traced over time to account for the rate in change of the liquid fraction. Analysis showed that, during the initial phase until about 45% liquid melt; the time taken was independent of fin location but increased linearly with fin number. Surprisingly, during the melt process, the fin at top section has a higher melting rate in the initial phase but decreases rapidly. However, this decrease is stabilized and increased by the bottom fins in the later phase when the liquid fraction is in the range of 45% to 90% that simultaneously helps in decreasing the melt time. But this stabilization is affected if the number of fins at the top is more than bottom.

Review on Phase Change Materials in Thermal Energy Storage System

2015 ◽  
Vol 766-767 ◽  
pp. 474-479
Author(s):  
B. Kanimozhi ◽  
Amit Arnav ◽  
Eluri Vamsi Krishna ◽  
R. Thamarai Kannan
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Storage System ◽  
Melting Process ◽  
Energy Storage System ◽  
Latent Heat Storage ◽  
Thermal Energy Storage System

Phase Change Materials (PCM) plays an important role in energy conservation, which is very attractive because of its high storage density with small temperature change. In this paper an attempt made to review number of paper based on Phase Change Materials (PCM) in various field of thermal energy storage systems and its applications. The Phase Change Material is the latent heat storage material. As the source temperature raises the chemical bonds within the PCM breaks and the material changes its phase from one phase to another phase. The material begins to melt when the phase change temperature is reached. The temperature then stays constant until the melting process is finished. Thermal Energy Storage deals with the storing of energy by cooling, heating, melting, solidifying or vaporizing a material, the energy becoming available as heat when the process is reversed. Hence it is important to study about phase change materials in thermal energy storage system.Keywords: Phase change materials, Thermal energy storage system, Encapsulation, solar system, Heating and cooling of building

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