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57. Experimental investigation and thermodynamic analysis of application of hybrid nanofluid in a parabolic solar trough collector.

Author

Wang, He, Abed, Azher M., Beemkumar, N., Kumar, Ambati Vijay, Ayed, Hamdi, Mouldi, Abir, and Shamel, Ali

Subjects
*PARABOLIC troughs, *MULTIWALLED carbon nanotubes, *IRON oxide nanoparticles, *NANOFLUIDS, *HEAT transfer fluids, *WORKING fluids, *FLUID flow
Abstract

In this research, thermal modeling has been done to investigate the effect of nanofluid on the performance of the linear parabolic collector. Therminol vapor/liquid phase fluid (VP-1) has been used as a base fluid; iron oxide nanoparticles have been used to produce mono-nanofluid; and iron oxide multi-walled carbon nanotubes nanocomposite has been used as nanoparticles to produce hybrid nanofluid. The fluid flow inside the absorber tube of the collector is assumed to be turbulent. The results show that when hybrid nanofluid and mono-nanofluid are used, the energy and exergy efficiencies of the collector are higher than those for the conditions of using the base fluid, but their amount is slightly lower with the use of hybrid nanofluid than when the working fluid is mono-nanofluid. According to the obtained results, the highest energy efficiency of the linear parabolic collector using nanofluid and mono-nanofluid is 70.2% and 70.4%, respectively, and the highest exergy efficiency is 35.7% and 35.9%, respectively. Despite this, the friction coefficient of mono-nanofluid compared to hybrid nanofluid was obtained on average about 9% higher. The results showed that the criterion for evaluating the performance of the collector (hydrodynamic thermal efficiency) when hybrid nanofluid is used is more than when mono-nanofluid is used. [ABSTRACT FROM AUTHOR]

Published
2024
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69. Numerical investigation of microcapsules of phase change materials with au nanoparticles: The effect of radius and the atomic ratio of Au nanoparticles on the thermal storage efficiency of the simulated structure

Author

Liu, Na, Abed, Azher M., Sulaiman, Jameel Mohammed Ameen, Altamami, Abdulmalek A., Mohammed, Sami, AbdulAmeer, Sabah Auda, Hadrawi, Salema K., abdulQader, Ammar abdul Haleem, Shamsborhan, Mahmoud, Alizadeh, As'ad, Nasajpour-Esfahani, Navid, and Sabetvand, Roozbeh

Published
2023
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87. Enhancement of heat transfer from solar thermal collector using nanofluid

Author

Smaisim Ghassan Fadhil, AbdulHussein Widad Abdullah, and Abed Azher M.

Subjects
augmentation, nanofluid, solar energy, solar collector, thermal fluid, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Global energy consumption is increasing due to population growth and with it the adverse impact of fossil fuels on the environment, making it necessary to use renewable energy sources and convert them to electrical energy using different technologies. However, the solar energy potential remains unused, while it has numerous advantages, including as a source of clean electricity and heat. One of the main difficulties in energy-saving and compacted design is how to increase the heat transfer of solar equipment. As an innovative approach to enhancing fluids’ heat transfer performance, some of the most active techniques are to exchange the working fluid with nanofluids. This work attempted to demonstrate heat transfer behavior changes when using nickel oxide (NiO), aluminum oxide (Al2O3), and copper oxide (CuO) as nanofluids at concentration volumes of 0.05, 0.075, and 0.1%. For this goal, a conical solar collector was built using local public steel sheets. Insulating polyurethane foam padding is used inside the cone. The sun’s energy is focused on the absorbing surface using thin reflective aluminum foil. The study also includes a literature review showing how nanofluids can improve heat transfer in solar collectors. The results showed that adding nanoparticles can increase the rate of heat transfer and CuO nanofluids have better augmentation in heat transfer than Al2O3 or NiO-water nanofluids where 1% CuO nanofluids increases the efficiency by up to 7% compared to water.

Published
2022
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88. Numerical studies of the simultaneous development of forced convective laminar flow with heat transfer inside a microtube at a uniform temperature

Author

Hamad Raisan F., Smaisim Ghassan F., and Abed Azher M.

Subjects
conjugate, enhancement of heat transfer, force convection, microtube, simultaneous, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Conjugate heat transfer is a complex problem because heat is transferred from a solid medium to a liquid medium through their interfaces. The steady-state laminar flow formed inside the microtubules is subjected to a constant temperature at the outer sidewall surface. These images cover a wide range of wall-to-fluid thermal conductivity ratios (ksf = 1, 2, 3, 4, and 5) and wall thickness-to-inner diameter ratios (δ/Ri = 0.25, 0.5, 0.75, 1, 1.25, and 1.5) and Reynolds numbers (Re = 200, 400, 600, 800, and 1,000). The results are processed by a Fluent program based on the finite volume method to numerically integrate the driver’s differential equations. The results show that increasing the wall-to-fluid thermal conductivity ratio ksf increases the inner wall dimensionless temperature and decreases the average Nusselt number. Conversely, an increase in the ratio of wall thickness to inner diameter results in a decrease in the dimensionless temperature of the inner wall and an increase in the average Nusselt number.

Published
2022
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89. An Investigation of Design and Simulation of Horizontal Axis Wind Turbine Using QBlade

Author

Altmimi Amani I., Aws Aya, Jweeg Muhsin J., Abed Azher M., and Abdullah Oday I.

Subjects
horizontal axis wind turbine, power generation, aerodynamic analysis, qblade, wind data analysis, Mathematics, QA1-939
Abstract

The wind turbine blade design is important in obtaining an effective wind turbine. In the field of wind energy, it is essential to understand the design and parameters affecting the blades of the wind turbine in order to obtain a successful design. However, most of the parameters are dependent on each other and this makes the design of wind turbines a challenging task. This research paper used the QBlade software to analyze and optimize the behavior of the small horizontal axis wind turbine. The software applies the Blade Element Momentum Theory (BEM) to study the wind turbine blades by calculating the drag and lift coefficients which were achieved by dividing the blades into 10 ascending segments. The twist angle and chord length of the blade are optimized to get the highest performance. Among the various airfoil types, the SG-6041 airfoil type was selected to build the blade structure. The calculated power coefficient was almost 0.4, which is considered high given that it was calculated under 10 m/s average wind speed and 1-meter length blade conditions. Where all the results are logical and reasonable, the software is proven to be reliable. The paper also evaluates the wind characteristics in different locations in Iraq in order to find the most optimal promising locations in Iraq.

Published
2022
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