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RISS 인기검색어
- 검색키워드
- 저자 : Abdel Illah Nabil Korti (검색결과 5 건)
- 무료
- 기관 내 무료
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Numerical Heat Flux Simulations on Double-Pass Solar Collector with PCM Spheres Media
Abdel Illah Nabil Korti 대한설비공학회 2016 International Journal of Air-Conditioning and Refr Vol.24 No.2
A transient two-dimensional (2D) mathematical model for double-pass solar collector with phase change material (PCM) spheres media in the lower channel has been developed. Numerical simulations model based on applying mass, momentum, and energy balances on finite volumes method are carried out. The governing equations inside the two channels, together with the energy equation in the absorber, insulating and glass cover walls were solved iteratively in a segregated manner. To show the effect of the presence of the PCM, a comparative study was undertaken between a collector with different PCM spheres, a collector without spheres, and another using gravel for thermal storage. To see the effect of the nature of PCM used, two different types were studied in various configurations, parallels and series. The study concluded that the presence of the PCM spheres at the bottom of the absorber is the best configuration and allows increasing the outlet temperature. Also, with combining several types of PCM we can improve significantly the thermal performance of collector.
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Computational analysis of phase change material and fins effects on enhancing PV/T panel performance
Reteri Ahmed,Korti Abdel Illah Nabil 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6
Hybrid Photovoltaic thermal (PV/T) collectors have assumed considerable importance for their dual-energy applicability, which is presentedin thermal and electrical form. When the main objective of the PV/T collector is to produce electricity, the thermal behavior of thehybrid collector plays an ameliorative role in dissipating the heat generated in the cell, and this increases the electrical efficiency accordingly. We studied the influence of temperature on the electrical behavior of the PV cell, with and without forced convection cooling. Three configurations were studied in the presence of cooling: A hybrid collector with air channel under the plate, hybrid collector with afinned channel, and hybrid collector with Phase change material (PCM) incorporated between the fins. Several parameters--temperatureof the cell, electrical efficiency, average Nusselt number and air temperature at the outlet of the channel--were studied. The results confirmthe ameliorative effect of forced convection cooling, with and without fins, as well as the important improvement in cooling due tothe presence of the PCM.
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Khouiled Rachedi,Abdel Illah Nabil Korti 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.4
One of the discussed techniques in improving the performance of latent thermal energy storage applications is to use different phase change materials (PCMs) encapsulated in spherical nodules. However, the large number of spheres used in the storage applications pushes the researchers to neglecting the natural convection effect inside spheres. Consequently, they cannot observe the real thermal interaction effect between spheres. The objective of this work is to carry out a computational study on the thermal behavior of two adjacent different PCMs inside aluminum spherical capsules and taking into account the natural convection effect inside the spheres. Water is used as heat transfer fluid (HTF) at constant inlet temperature. The study shows that for the HTF inlet velocity lower than 10 −5m/s, the thermal interaction between two adjacent different PCMs cannot be neglected. However, the thermal interaction appears more clearly in the discharging mode. The thermal interaction can accelerate the discharging of one of the PCMs by reducing the discharging of the other one
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Souheyla Khaldi,Abdel Illah Nabil Korti,Said Abboudi 대한설비공학회 2017 International Journal of Air-Conditioning and Refr Vol.25 No.3
Successful drying requires a uniform heating of the product along the trays. This condition is a real challenge in the design of solar dryers. Studies show that a conventional solar dryer provides a nonuniform temperature distribution at the trays level. This paper seeks to remedy this problem by adding a second air inlet to the cabinet dryer in order to get a more homogeneous temperature. Unsteady turbulent airflow and heat transfer through a two-dimensional model is carried out for a typical day of August under the climatic conditions of Tlemcen (Algeria). Figs fruit was selected to be dried. The effect of the proposed configuration on the dynamic and thermal behaviors of the solar dryer has been discussed. The results revealed that using two opposite inlets can improve the drying process by reducing the fluctuation of the temperature to about 67% and increasing the mass flow rate by about 18%.
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Improvement of thermal conductivity and energy stored by paraffin with different metallic additives
Khaoula Missoum,Hocine Guellil,Abdel Illah Nabil Korti 대한설비공학회 2020 International Journal Of Air-Conditioning and Refr Vol.28 No.3
Phase change thermal storage is an innovative technology for saving energy. It is one of the new areas of research because it provides the solution to problems related between the provided and the required energies. Praffin is a common phase change material(PCM) that used in many applications in thermal energy storage(TES) systems. However, the main disadvantage is their low thermal conductivities. However, using metallic additives to improve effective energy stored. An experimental study is carried out to analyze the thermal behavior of the paraffin melting in a thermal cavity integrating different metals (zamak, aluminum and copper) with different configuration. The originality of study is to try to predict the best duo that respects both the improvement of thermal conductivity and energy stored. The expetiments shows that addind the aluminum perforated plate in the paraffin can accelerates the melting process by about 19% and increases the energy sored by 5.18%.
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