Navid Bozorgan Articles List

List of Articles Navid Bozorgan

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1 - Evaluation of the using Al2O3/EG and TiO2/EG nanofluids as coolants in the double-tube heat exchanger
Navid Bozorgan

Abstract: In this study, Al2O3/EG and TiO2/EG nanofluids as coolants have been used in the double-tube heat exchanger. The hot solvent inlet heat exchanger must be cooled down with a specified amount. We can use nanofluids as coolants in the heat exchanger for optimizat More

Abstract: In this study, Al2O3/EG and TiO2/EG nanofluids as coolants have been used in the double-tube heat exchanger. The hot solvent inlet heat exchanger must be cooled down with a specified amount. We can use nanofluids as coolants in the heat exchanger for optimization of the heat transfer area. Therefore, the efficacy of nanofluids as coolants is verified. Furthermore, flow rate of coolant is optimized by using the Al2O3/EG and TiO2/EG nanofluids in the heat exchanger. Thus with decreasing the heat transfer area and flow rate of the coolant, we can reduce the costs such as pumping power, fouling costs, etc in a double-tube heat exchanger. The heat transfer relations between hot solvent and nanofluids as coolants in the heat exchanger have been investigated. The results showed that the overall heat transfer coefficient was high, when the probability of collision between nanoparticles and the wall of the heat exchanger was increased under higher concentration. Consequently, we calculated the heat transfer coefficient, overall heat transfer coefficient, friction factor, pressure drop and pumping power for Al2O3/EG and TiO2/EG nanofluids used as coolants in a double-tube heat exchanger. Manuscript profile
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2 - Evaluation of the Heat and Mass Transfer and Exergy in the Counter Flow Wet Cooling Tower of Khuzestan Steel Company (KSC)
Navid Bozorgan Nariman Bozorgan

A thermodynamic analysis of the counter flow wet cooling tower (CWCT) in the Steelmaking unit of the Khuzestan Steel Company (KSC) is performed in this paper. We evaluated both energy and exergy formulations for analyzing the heat and mass transfer, exergy and second-la More

A thermodynamic analysis of the counter flow wet cooling tower (CWCT) in the Steelmaking unit of the Khuzestan Steel Company (KSC) is performed in this paper. We evaluated both energy and exergy formulations for analyzing the heat and mass transfer, exergy and second-law efficiency in this cooling tower. The Lewis factor Lef is an indication of the relative rates of heat and mass transfer in an evaporative process. In many performance analyses of the cooling tower, Lef is assumed to be 1 in order to simplify the heat and mass transfer equations between air and water. If so, evaporative loss is negligible. But in this paper, although heat and mass transfer equations and their numerical solutions are more complicated, Lef is calculated for all parts of the tower in order to achieve more accurate results in predicting air and water conditions into the cooling tower in the analysis on the performance of this cooling tower. Manuscript profile
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3 - THE ENERGY AND EXERGY ANALYSIS OF SINGLE EFFECT ABSORPTION CHILLER
Farshad PanahiZadeh Navid Bozorgan

The first and second laws of thermodynamics have been employed to evaluate energy and exergetic efficiency of the single effect absorption chiller which is used for air conditioning purpose. The performance analysis has been carried out by developing a computer program More

The first and second laws of thermodynamics have been employed to evaluate energy and exergetic efficiency of the single effect absorption chiller which is used for air conditioning purpose. The performance analysis has been carried out by developing a computer program in EES and modeling the chiller and its components. To evaluate entropy of the water/lithium bromide solution at any point, an empirical correlation has been utilized. Exergy destruction and thermodynamic properties at any point in the cycle are evaluated by using related equations or build in property data. The results showed that maximum exergy destruction was occurred in the generator and the absorber at various operating conditions and these components had greater effect on the energy and exergetic efficiency rather than condenser and evaporator. Thus, it can be clearly stated that the generator and absorber are the most important components of the absorption chiller. The results also showed the exergetic efficiency was less than the energy efficiency due to exergy destruction taking place within the absorption chiller. Therefore, it can be concluded that the exergy analysis has been proven to be a more powerful tool in pinpointing real losses and can be used as an effective tool in designing an absorption chiller and obtaining optimum operating conditions. Manuscript profile
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4 - Evaluation of γ-Al2O3/n-decane Nanofluid Performance in Shell and Tube Heat Recovery Exchanger in a Biomass Heating Plant
Navid Bozorgan Maryam Shafahi

The performance of a γ-Al2O3/n-decane nanofluid shell-and-tube heat exchanger in a biomass heating plant is analyzed to specify the optimum condition based on the maximum heat transfer rate and performance index for wide range of nanoparticle volume fraction (0&nd More

The performance of a γ-Al2O3/n-decane nanofluid shell-and-tube heat exchanger in a biomass heating plant is analyzed to specify the optimum condition based on the maximum heat transfer rate and performance index for wide range of nanoparticle volume fraction (0–7%). Compared with pure n-decane, the obtained results in this research show that by using γ-Al2O3/n-decane nanofluid as coolant at optimum values of particle volume concentration for maximum heat transfer rate (ϕ=0.021) and for maximum performance index (ϕ=0.006), the heat transfer rate and pumping power increased by 10.84%, 13.18% and 6.72%, 2.3%, respectively. Increasing particles concentration raises the fluid viscosity, decreases the Reynolds number and consequently decreases the heat transfer coefficient. As a result, determining the optimum value of the particle volume fraction of nanofluid as the working fluid, can improve the performance of shell-and-tube heat exchangers. Manuscript profile
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5 - Design and Optimization of Gasketed-Plate Heat Exchanger using Bees Algorithm
Navid Bozorgan Ashkan Ghafouri Ehsanolah Assareh Seyed Mohammad Safieddin Ardebili
10.30495/admt.2021.1907203.1211

In the present study, the hydraulic-thermal design and optimization of a gasketed-plate heat exchanger (GPHE) with an objective function of heat exchanger performance index (the amount of transferred heat exchange to pumping power ratio) is carried out. This process is More

In the present study, the hydraulic-thermal design and optimization of a gasketed-plate heat exchanger (GPHE) with an objective function of heat exchanger performance index (the amount of transferred heat exchange to pumping power ratio) is carried out. This process is made by considering 6 design parameters (the port diameter, plate thickness, the enlargement factor, the compressed plate pack length, the horizontal port distance, and the vertical port distance) and through the Bees Algorithm (BA). The present study achieved three solution sets for the design parameters by investigating the sensitivity of the design parameters heeded in the optimization of the GPHE. The design parameters in these three optimal solution sets were opted for in such a way that heat transfer increased by 41.6%, 34.55%, and 20.7%, and pressure drop decreased by 11.89%, 27%, and 83%, respectively. Manuscript profile

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List of Articles Navid Bozorgan