Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14901/696

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Citation - WoS: 42
Citation - Scopus: 49
Experimental and Numerical Investigation on Thermoelectric Coolers for Comparing Air-To-Air-To Refrigerators
(Springer, 2021) Afshari, Faraz
It has been determined that a significant portion of the total electrical energy is consumed for different cooling and refrigeration purposes at both domestic and industrial sectors. Moreover, cooling systems are employed in a wide range of critical fields such as food industry and pharmacy. In this study, experimental and numerical approach to evaluate two different modes of thermoelectric cooler efficiency is presented. Portable thermoelectric refrigerators operated by Peltier element have been constructed, and experiments are conducted to compare efficiency of air-to-water and air-to-air thermoelectric coolers. In air-to-air mode, the Peltier device was united with heat sinks and fans on both sides. However, in air-to-water mode, a water pump and suitable water-cooled heat exchanger were used to operate in the refrigerators made of styrofoam sheets. It was revealed that, in the laboratory conditions, air-to-water mode is more efficient than air-to-air mode and COP value of the air-to-water is approximately 30-50% higher than that of air-to-air refrigerator. Moreover, ANSYS Fluent 16.0 software has been used to analyze the problem closely in detail. The problem has been simulated, and CFD results were used to visualize flow structure and heat transfer characteristics inside refrigerator box.
Citation - WoS: 3
Citation - Scopus: 3
Experimental and Numerical Study of a Solar Still with External Solar Heating: Comparing Internal Condensation and Air-Pump External Condensation in Prism Structures
(Emerald Group Publishing Ltd, 2025) Afshari, Faraz
PurposeThe purpose of this study is to develop and evaluate a novel solar still system integrating external solar heating and condensation units, comparing its performance with traditional methods through experimental and numerical analyses to optimize clean water production and energy efficiency.Design/methodology/approachThis study involved designing a novel solar still system with an external solar heating unit and a prism-type condensation chamber. Two configurations were tested experimentally: one with internal condensation inside the prism and another with an air pump extracting vapor for external condensation. computational fluid dynamics (CFD) simulations were conducted to analyze temperature distributions and airflow dynamics in the system. Energy and exergy analyses were performed to evaluate the thermal performance and efficiency of both configurations, comparing clean water production rates and system effectiveness.FindingsThis study found that the solar still system using an air pump with external condensation significantly enhanced water production, achieving approximately 144.7% more clean water compared to the internal condensation method. Scenario 2, with the external condensation configuration, demonstrated a slight improvement in thermal efficiency (12.84%) over Scenario 1 (12.36%) and higher exergy efficiency (5.86% compared to 4.83%). CFD simulations provided insights into the temperature and air velocity distributions, highlighting the effectiveness of the external heating and condensation setup. The results demonstrate the potential of the novel system to improve clean water production while maintaining energy efficiency.Originality/valueThis study introduces a novel solar still design that integrates an external solar heating unit and an air pump-driven external condensation system, demonstrating a significant improvement in clean water production. By combining experimental results, CFD simulations and energy-exergy analyses, it provides valuable insights for optimizing solar-powered desalination systems with enhanced efficiency and sustainability.
Citation - WoS: 17
Citation - Scopus: 16
Experimental and Numerical Study on Heat Transfer Enhancement of Home Radiators by Employing Solar Cells and Fans
(Begell House Inc, 2020) Afshari, Faraz
In the traditional heating systems, heated water in the boiler is circulated in the home radiators to warm up the ambient temperature as an air conditioning system. Generally, in the mentioned systems, the natural convection has a key role in the heat transfer from the radiator to the surroundings. The forced convection can be also applied by using air fans, and consequently the Nusselt number will be increased, which means an increase in the efficiency and heat transfer. In this work, the air fans were placed in a sample radiator to improve the thermal efficiency. The used fans are powered by batteries, and the battery supply is charged by solar cells. The fans will be able to operate at nights when the electric energy of the solar cells has been stored in the accumulator. The problem was simulated using the ANSYS Fluent software to compare the obtained numerical results to those recorded experimentally. In numerical and experimental results, an increase in heat transfer was observed. The obtained results showed that the average heat transfer rate was improved by about 21% by using forced convention.
Citation - WoS: 24
Citation - Scopus: 25
Experimental Comparative Analysis of Solar System Productivity and Performance in Water Distillation: Solar Stills Vs. Parabolic Dish Systems
(Elsevier, 2024) Afshari, Faraz
This study aims to evaluate the practical suitability of two solar technologies, Solar Stills and Solar Parabolic Dishes, in meeting energy demands for various applications, including preparing distilled water and other applications. Through the analysis, solar still systems were found to be the preferred choice for distilled water production due to their ability to yield significant amounts of pure water through simple or advanced designs. Conversely, the results showed that solar parabolic dishes are more suitable for applications requiring higher temperatures, such as cooking, as they concentrate solar radiation into smaller focal points. This study presents essential information for efficient energy management in specific water treatment applications, assisting in the selection of appropriate solar technologies. The results showed that the Parabolic Dish Concentrator (PDC) achieved an impressive temperature of 96.5 degrees C. Nonetheless, even though these high temperatures were attained, the experiments did not lead to the production of distilled water. Based on the results, the thermal efficiency of the solar still was calculated at 5.6 % without modification and 9.4 % with the implemented modification. Conversely, the solar still's productivity witnessed a notable increase of around 66.6 % with a straightforward modification involving the incorporation of operational fans. Additionally, there was a substantial enhancement in efficiency, registering a remarkable rise of 67.8 %.

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