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Öğe FEXPERIMENTAL INVESTIGATION OF PV/T SOLAR COLLECTOR EFFICIENCY WITH SPHERICAL-SHAPED PROTRUSIONS ON THE ABSORBER SURFACE(Taylor's University, 2023) Ajel, M.G.; Gedik, E.; Wahhab, H.A.A.; Mahdi, L.A.A.; Chaichan, M.T.The Accumulated heat on the PV panels' upper surface could be dissipated by water circulation in the backside attached collector. This paper presents an experimental study to improve the performance of the PV/T system by modifying the collector design using a spherical bulge on the collector surface. The work was carried out at the University of Technology-Iraq. Two PV solar cells have been used in the experimental investigation. One is cooled by different water flow rates of 1.5, 2, 2.5, and 3.5 l/min; the other is a bare reference unit without any modification. The illustrated bludges are a matrix of spheres with a 25 mm radius arranged in 8 rows by 15 columns. The thermal efficiency of the PV/T increased by 8.08%, and electrical efficiency increased by 8.1% compared with the bare panel. Additionally, the impact of flow rate was discussed and evaluated in this study. Increased water flow rate decreased the PV surface temperature in the new model. With a flow rate of 3.5 l/m, the maximum surface temperature decrease was 15.4%. © School of Engineering, Taylor’s University.Öğe Impact of Alumina NanoparticlesAdditives onOpen-Flow Flat Collector Performance for PV Panel Thermal Control Application(Joint Journal of Novel Carbon Resource Sciences and Green Asia Strategy, 2023) Shallal, B.A.; Gedik, E.; Wahhab, H.A.A.; Ajel, M.G.Photovoltaic Cells are devices made of semiconductor materials that is used to convert solar energy to electrical energy in the form of a constant current. The efficiency of the photovoltaic cell increases with the increase in solar radiation while its generation efficiency decreases with the increase in Photovoltaic Cell temperature above the standard temperature. Therefore, researchers implement methods to decrease overheating. One of these methods is using PV/T. This paper presents an experimental and numerical study on the performance of the Photovoltaic/Thermal (PV/T) system by using Nanofluids with a new design (novelty; sphere fins in open flow flat collector) of the water collector. Experiments were carried out in Iraq/Baghdad/University of Technology. Nanofluids Al2O3/water was used at different volume concentration ratio as 1%, 2%, and 3% for cooling of PV panel. The influence of new design of collector and Nano additives on the PV/T performance at various operational parameters have been simulated and evaluated using ANSYS Fluent software to solved the Navier-Stockes and energy equations. Numerical results noticed a decrease in the surface temperature of the collector by 5.1% when using a Nano liquid with a concentration 1% compared to its temperature when using water only, while it decreases by 6.2% and 7.8% when using concentrations 2% and 3%, respectively at flow rate 3.5 l/min. The evaluation result demonstrates that the performance of PV/T system increased, also the Nanoparticles helped to system enhances. © 2023 Novel Carbon Resource Sciences. All rights reserved.Öğe NUMERICAL ANALYSIS OF THE STEAM TURBINE PERFORMANCE IN POWER STATION WITH A LOW POWER CYCLE(Taylor's University, 2023) Bdaiwi, M.; Akroot, A.; Wahhab, H.A.A.; Mahariq, I.In this paper, an analysis of the temperature and quantity balance of the thermal power plant for the Al-Dura (K-160-13.34-0.0068) station was first studied and used for reference. This work describes a possible way to build a simulation model of the most important parts of power plant Al-Dura (K-160-13.34-0.0068). The Cycle-Tempo and MATLAB/Simulink packages are used to model the energetic and exergetic analysis of the power plant. MATLAB/Simulink software was used to simulate the behaviour of a Steam turbine with high-pressure, intermediate-pressure, and low-pressure steam, with a load response in a stable circumstance over a range of 50% to 100%. The model is based on "Stodol's law" and simulates the pressure and enthalpy alongside the dissimilar turbine phases and the vapor and water extraction. The effect of the vapor and water extraction on the turbine is also elucidated. Areas of essential energy loss and exergy decimation will be resolved. The impact of changing the power plant load on the exergy analysis is determined. The response of suggested purposes to estimate these vapor properties is compared with standard data and showed high accuracy (the modelling error is less than 0.01%). © 2023 Taylor's University. All rights reserved.Öğe NUMERICAL SIMULATION OF A POROUS MEDIA SOLAR COLLECTOR INTEGRATED WITH THERMAL ENERGY STORAGE SYSTEM(Taylor's University, 2023) Nawaf, M.Y.; Akroot, A.; Wahhab, H.A.A.Increasing the contact area between the working fluid and solid surface is proven to be a successful technique for enhanced heat transfer. This paper presents computational simulation results of a closed active solar water heating system. The system is a novel solar water heating as it is compacted with a heat transfer unit filled with an open cell foam porous media for increased heat transfer area and molten salts of 60% sodium nitrate and 40% potassium nitrate as phase change material. Water is circulated between the collector and a storage tank. The numerical simulation and analysis were performed using ANSYS FLUENT 17.0, assuming a steady, incompressible, and 3D state. The system performance was tested using two flow rates of the circulating water of 2.5 and 3.5 l/min. Numerical results showed that the temperature difference between the inlet and outlet decreases with increasing water flow rates through the solar water heater. The temperature difference decreased by 11.5% when the flow rate increased from 2.5 to 3.5 l /min. Also, the results showed a good prediction of the real flow behaviour inside the thermal energy storage. Also, the evolution of the numerical simulation accuracy for porous media solar collector analysis is still a topic of future research. © 2023 Taylor's University. All rights reserved.Öğe PREDICTION OF PREMIXED FLAMES CHARACTERISTICS OF LIQUEFIED PETROLEUM GAS (LPG) / HYDROGEN GAS MIXTURES(Taylor's University, 2023) Ghazal, R.M.; Akroot, A.; Wahhab, H.A.A.The laminar burning velocities of liquid petroleum gas (LPG)-hydrogen-air mixtures are emphasized. They play a crucial role in designing and predicting combustion progress and the performance of combustion systems that utilize hydrogen as fuel. This work uses laminar burning velocities of different compositions of Iraqi LPG-hydrogen-air mixtures (4 and 10 vol.%). The measurements have been taken at ambient temperature and pressure for various equivalence ratios (? = 0.21 to 1.23). A counter combustor with a symmetrical premixed flame is suggested to enhance stability efficiency and temperature distribution and improve heat transfer with hydrogen gas addition at different percentages. The results have been demonstrated by an increase in the hydrogen concentration within hydrogen-LPG mixtures (0, 4, and 10%vol. of hydrogen) leads to a significant increase in both flame temperature (1070, 1100, and 1154 K) and burning velocities (26.7, 33 and 49.5 cm/s) respectively. Adding hydrogen to LPG makes it an excellent substitute for hydrocarbon fuels since it provides a stable flame and a large explosive area. © 2023 Taylor's University. All rights reserved.
