Melting Process of the Nano-enhanced Phase Change Material (NePCM) in an Optimized Design of Shell and Tube Thermal Energy Storage (TES): Taguchi Optimization Approach

2021 ◽  
pp. 116945
Author(s):  
Mohammad Ghalambaz ◽  
S.A.M. Mehryan ◽  
Ali Veisimoradi ◽  
Mahboobeh Mahdavi ◽  
Iman Zahmatkesh ◽  
...  
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Melting Process ◽  
Optimization Approach ◽  
Optimized Design ◽  
Taguchi Optimization ◽  
Shell And Tube ◽  
Change Material

scholarly journals Kajian Peleburan Dan Pembekuan Material Berubah Phasa Pada Thermal Storage

2018 ◽  
Vol 1 (1) ◽  
pp. 129-136
Author(s):  
Chandra A Siregar ◽  
Ilmi Abdullah ◽  
Himsar Ambarita
Keyword(s):  
Energy Storage ◽  
Stearic Acid ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Melting Process ◽  
Paraffin Wax ◽  
Smelting Process ◽  
Heat Value ◽  
Change Material

Kajian fenomena peleburan dan pemadatan material berubah phasa (Phasa Change Material/PCM) dilakukan untuk mengamati proses peleburan dari Paraffin Wax dan Stearic Acid. Percobaan dilakukan pada temperatur 90 0C, 85 0C, dan 80 0C dengan menggunakan kotak kaca dan durasi waktu peleburan 600 menit. Pengamatan visualisasi dilakukan dalam bentuk foto. Hasil pengamatan visualisasi menyatakan bahwa temperatur Thermal Energy Storage (TES) yang lebih tinggi bergerak keatas. Oleh karena itu, proses peleburan terlebih dahulu terjadi pada bagian atas. Selain itu, dalam proses pembekuan TES dimulai dari bagian bawah menuju ke atas. Dari hasil penelitian ditemukan bahwa Paraffin Wax lebih efektif digunakan daripada Stearic Acid karena mampu menyerap panas lebih tinggi. Pada temperatur pengujian 90 0C diperoleh nilai panas tersimpan pada Paraffin sebesar 61,84 kJ sedangkan pada Stearic Acid 57,392 kJ.   The study of the phenomenon of fusion and compaction of phase-changing materials (Phase Change Material / PCM) was carried out to observe the melting process of Paraffin Wax and Stearic Acid. The experiment was carried out at temperatures of 90 0C, 85 0C, and 80 0C using a glass box and the duration of smelting time was 600 minutes. Visualization observation is done in the form of photos. The results of visualization observations state that higher Thermal Energy Storage (TES) temperatures move up. Therefore, the smelting process first occurs at the top. In addition, in the process of freezing the TES starts from the bottom to the top. From the results of the study it was found that Paraffin Wax is more effective to use than Stearic Acid because it can absorb higher heat. At the 90 0C test temperature the heat value stored in Paraffin was 61.84 kJ while in Stearic Acid 57,392 kJ.

scholarly journals Phase Change Material Melting Process in a Thermal Energy Storage System for Applications in Buildings

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3254 ◽  
Author(s):  
Túlio Nascimento Porto ◽  
João M. P. Q. Delgado ◽  
Ana Sofia Guimarães ◽  
Hortência Luma Fernandes Magalhães ◽  
Gicelia Moreira ◽  
...  
Keyword(s):  
Heat Flux ◽  
Energy Storage ◽  
Heat Exchanger ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Melting Process ◽  
Average Heat ◽  
Change Material

The development of thermal energy storage systems is a possible solution in the search for reductions in the difference between the global energy supply and demand. In this context, the ability of some materials, the so-called phase change materials (PCMs), to absorb and release large amounts of energy under specific periods and operating conditions has been verified. The applications of these materials are limited due to their low thermal conductivity, and thus, it is necessary to associate them with high-conductivity materials, such as metals, to make the control of energy absorption and release times possible. Bearing this in mind, this paper presents a numerical analysis of the melting process of a PCM into a triplex tube heat exchanger (TTHX) with finned copper tubes, which allowed for the heat transfer between a heating fluid (water) and the phase change material to power a liquid-desiccant air conditioning system. Through the analysis of the temperature fields, liquid fractions, and velocities, as well as the phase transition, it was possible to describe the material charging process; then, the results were compared with experimental data, which are available in the specialized literature, and presented mean errors of less than 10%. The total required time to completely melt the PCM was about 105.5 min with the water being injected into the TTHX at a flow rate of 8.3 L/min and a temperature of 90 °C. It was observed that the latent energy that accumulated during the melting process was 1330 kJ, while the accumulated sensitive energy was 835 kJ. The average heat flux at the internal surface of the inner tube was about 3 times higher than the average heat flux at the outer surface of the TTHX intermediate tube due to the velocity gradients that developed in the internal part of the heat exchanger, and was about 10 times more intense than those observed in the external region of the equipment.

Thermal Energy Storage Through Melting of a Commercial Phase Change Material in an Annulus with Radially Divergent Longitudinal Fins

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Tonny Tabassum Mainul Hasan ◽  
Latifa Begum
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Operating Conditions ◽  
Melting Time ◽  
Bottom Part ◽  
Change Material

This study reports on the unsteady two-dimensional numerical investigations of melting of a paraffin wax (phase change material, PCM) which melts over a temperature range of 8.7oC. The PCM is placed inside a circular concentric horizontal-finned annulus for the storage of thermal energy. The inner tube is fitted with three radially diverging longitudinal fins strategically placed near the bottom part of the annulus to accelerate the melting process there. The developed CFD code used in Tabassum et al., 2018 is extended to incorporate the presence of fins. The numerical results show that the average Nusselt number over the inner tube surface, the total melt fraction, the total stored energy all increased at every time instant in the finned annulus compared to the annulus without fins. This is due to the fact that in the finned annulus, the fins at the lower part of the annulus promotes buoyancy-driven convection as opposed to the slow conduction melting that prevails at the bottom part of the plain annulus. Fins with two different heights have been considered. It is found that by extending the height of the fin to 50% of the annular gap about 33.05% more energy could be stored compared to the bare annulus at the melting time of 82.37 min for the identical operating conditions. The effects of fins with different heights on the temperature and streamfunction distributions are found to be different. The present study can provide some useful guidelines for achieving a better thermal energy storage system.

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