Bachelor

Oct 1, 2000 - Jul 1, 2004

Bachelor degree of Engineering in Refrigeration and Air-conditioning

M.Sc.

Sep 1, 2009 - Feb 16, 2012

degree of M.Sc. in Mechanical Engineering in Refrigeration and Air-conditioning

Ph.D.

Sep 19, 2021 - Mar 9, 2025

Ph.D. in Thermal Engineering

Performance and Heat Transfer Characteristics in Loop Thermosyphon (An Experimental Study)

Apr 28, 2013

Journal Al-Rafidain Engineering Journal

publisher John Wiley & Sons, Ltd.

DOI https://doi.org/10.33899/rengj.2013.72803

Issue 2

Volume 21

A Loop Thermosyphon has been designed, fabricated and tested to investigate the heat transfer characteristics by two-phase natural convection. The rig was made from copper tubes connected with each other in closed loop including four main parts: vertical evaporator located in the bottom of the device and surrounded by an electrical coil heater as a heat source ,a horizontal condenser located in the upper part of the device cooled by water, vapor rising adiabatic tube and condensate return adiabatic tube. In this research the effect of heat input and filling ratio of the evaporator on the heat transfer coefficient and temperature distribution on the loop surface was verified experimentally using distilled water as working fluid at operating pressure near-atmospheric pressure. The maximum heat transport capability for evaporator was found to be equal to (3424 W/m2 oC). A comparison between the present work results with empirical and theoretical correlations of other researchers showed good agreement.

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Effects of varying orifice diameter and Reynolds number on discharge coefficient and wall pressure

Mar 1, 2019

Journal Flow Measurement and Instrumentation

publisher Elsevier Ltd

DOI 10.1016/j.flowmeasinst.2019.01.004

Issue 09555986

Volume 65

In this paper, an experimental study has been performed to investigate the performance of varying diameter of orifice that made from acrylic plastic on the flow characteristics. A colour water has been used as a working fluid to flow through a PVC pipe system. The orifice has a sharp-edged with 30° angle and the pipe system has thirty tapping points across the orifice for the pressure measurement. The experiments have been carried out for different beta ratio and Reynolds number. The results clearly demonstrated that the beta ratio has a positive effects on the discharge coefficient particularly at the laminar flow regime whereas it has inversely effects on pressure head losses. Therefore, geometric parameters are required to be properly designed in order to achieve the desired objective. It has been also found that the orifice discharge coefficient reduces with increasing in Reynolds number for all values of beta ratio especially at the turbulent flow regime and hence adequate must be taken while designing such orifice. The results obtained in the present study have been compared with that predicted from an empirical correlations and they show a good agreement between them. Finally, a statistical analysis has been carried out in order to determine a fitting correlation for the discharge coefficient based on the present experimental data.

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An experimental investigation of a double pass solar air heater performance: A comparison between natural and forced air circulation processes

Nov 15, 2019

Journal Solar Energy

publisher Elsevier Ltd

DOI 10.1016/j.solener.2019.09.060

Issue 0038092X

Volume 193

This work involves an experimental study on a trapezoidal Double-Pass Solar Air Heater (DPSAH) to analyse its performance under natural and forced convection cases for the purpose of comparison. The experiments have been conducted in winter and compared for each case in same time and weather conditions. The collector has been carefully designed and constructed to prevent as possible the heat losses. A uniform fins have been fixed on both sides of the absorber plate to enhance the heat exchange rate. Effects of solar radiation and air mass flowrate on DPSAH performance have been investigated. The results show that DPSAH produces higher efficiency when the system is operated under natural convection case in comparison to forced convection case. The maximum efficiency has been found equal to 73.5% and 65% for natural and forced convection, respectively. A significant temperature difference has been obtained under natural convection case compared to forced convection. The results confirmed that DPSAH with adding fins leads to considerable performance improvement compared to conventional DPSAH due to enhance the absorbing solar energy caused by increasing surface area. The increasing in air mass flowrate has inverse influence on the performance of DPSAH. For natural circulation case, the outlet, plate and glass temperatures have been always observed higher than the forced convection case. It is evident that type of heat transfer has considerably affect the system performance and consequently, the selection of air circulation process are required to be satisfactorily chosen according to the application to achieve the desired objective.

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Experimental study of compound parabolic concentrator with flat plate receiver

Feb 5, 2020

Journal Applied Thermal Engineering

publisher Elsevier Ltd

DOI 10.1016/j.applthermaleng.2019.114678

Issue 13594311

Volume 166

In this paper, an experimental work has been performed to investigate the performance of a new Compound Parabolic Concentrator (CPC) with a flat plate receiver model. The CPC structure has been designed based on the two offset large parabolas reflector surfaces with a concentration ratio equal to 1.5. The experiments have been carried out in winter 2019 from beginning of January to end of March using the solar radiation of Mosul city in Iraq under outdoor clear sky condition for around 8 h during the day. The experimental results indicate that the increase in water mass flowrates enhances the efficiency of the collector and reduces the outlet water temperature. The results show that the change in months from January to March has little impact on the total solar radiation. The maximum solar radiation has been recorded in March and the peak value has been observed between 12 PM and 1 PM. The results also indicate that the CPC provides a maximum efficiency 26.5% and hence, sufficient consideration should be taken while designing such CPC collectors. It is evident that CPC area has significantly effect on the collector performance. The present study provides a useful tools for calculating the efficiency of CPC for Mosul city.

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A thermal nonequilibrium model to natural convection inside non‐Darcy porous layer surrounded by horizontal heated plates with periodic boundary temperatures

Sep 28, 2021

Journal Heat Transfer

publisher John Wiley and Sons Inc

DOI 10.1002/htj.22162

Issue 26884534

Volume 50

This article displays a numerical investigation on natural convection within non-Darcy porous layer surrounded by two horizontal surfaces having sinusoidal temperature profiles with difference in phase and wave number. The Darcy–Brinkman–Forchheimer model and local thermal nonequilibrium condition have been employed. Simulations have been performed for wide ranges of inertia coefficient (10–4 ≤ Fs/Pr* ≤ 10–2), thermal conductivity ratio (0.1 ≤ K r ≤ 100), phase difference (0 ≤ β ≤ π), modified Rayleigh number (200 ≤ Ra* ≤ 1000), wavelength (3 ≤ k ≤ 12), and nondimensional heat transfer coefficient (0.1 ≤ H ≤ 100). Results demonstrate that Nusselt number highly relies on Fs/Pr*, K r, β, Ra*, and k as compared to H. A considerable enhancement in fluid, solid, and overall Nusselt numbers has been observed with diminishing Fs/Pr* and β and increasing k, K r, and H. The raising in β has a significant impact on Nu for smaller k and this effect is almost ignored when k > 12. The increase in Ra*, K r, β, and H and decrease in Fs/Pr* and k acts to reduce the severity of nonequilibrium zone and increase the size of thermal equilibrium zone. The influence of H on nonequilibrium area is more evident than K r.

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Improving the performance of solar air heater using a new model of V-corrugated absorber plate having perforations jets

May 1, 2022

Journal International Journal of Energy Research

publisher John Wiley and Sons Ltd

DOI 10.1002/er.7715

Issue 0363907X

Volume 46

An experimental investigation on the performance of a solar air heater (SAH) system has been performed using a new model of v-corrugated absorber plate having perforations jets. The effectiveness of new model has been compared with the conventional v-corrugated absorber plate under identical operating conditions to display the effectiveness of new model. The new collector has been referred to Model-1, whereas the conventional model has been referred to Model-2. The experimentations have been conducted in December 2020. The results demonstrate that the performance of Model-1 is considerably higher than Model-2 by 9%, 11%, and 11.5% for the air mass flowrates 0.01, 0.015, and 0.02 kg/s, respectively. As mass flowrate is increased, the performances of both models have increased, where the highest efficiencies of Model-1 and Model-2 have been found 84.5% and 73%, respectively. A substantial difference in temperature has been found in Model-1 as compared to the rest model. Regardless of the air velocity values, the maximum outlet temperatures have been found in Model-1, whereas the peak plate temperatures have been observed in Model-2. The improvement in the performance of Model-1 confirms that the utilize of perforations jets v-corrugated absorber plate has an extreme action on the rate of heat transfer.

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Performance analysis of Pelton turbine under different operating conditions: An experimental study

Jun 1, 2022

Journal Ain Shams Engineering Journal

publisher Elsevier Ltd

DOI 10.1016/j.flowmeasinst.2019.01.004

Issue 4

Volume 13

In this article, an experimental work has been carried out to examine the effect of varying operating conditions on performance of Pelton turbine. The experiments have been performed for various nozzle jet diameters (d), volume flowrate (Q) and pressure head (H). The experimental results display that the rise in d leads to reduce the input power due to decrease in H. For a certain nozzle diameter, the results indicated that the maximum brake power increases with increasing in Q owing to increase the torque and consequently, the optimum operational condition can be achieved when using smaller d and higher Q. The best turbine performance has been found when using d = 9.5 mm and Q = 85 L/min owing to produce higher efficiency and cover large range of wheel speed. The maximum efficiency of nozzle diameters 9.5 mm, 10.5 mm, 11.5 mm and 12.5 mm have been found equal 35.5%, 33%, 29.2% and 21.6%, respectively. Hence, d has inversely effect on the turbine performance. The data clearly also indicate that d and Q have substantially influences on the power that generated by turbine. By recognizing the effects of related parameters, it is now possible to generate a higher electric power in hydroelectric power plants that operated by using Pelton turbine.

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Efficiency enhancement of solar air heater collector by modifying jet impingement with v-corrugated absorber plate

Nov 15, 2022

Journal Journal of Energy Storage

publisher Elsevier Ltd

DOI 10.1016/j.est.2022.105535

Issue 2352152X

Volume 55

The current work involves an experimental investigation of a modified v-corrugated absorber plate to get a better performance of the Solar Air Heater (SAH) collector. The thermal efficiencies of the modified and the normal v-corrugated collector having a jet plate blown systems are compared to present the actions of the modified system. The modified system is named Model-1, whereas the normal system is called Model-2. The experimentation has been done in winter 2021 in Mosul city, Iraq. The results confirm that the thermal efficiency of Model-1 is more efficient than Model-2 by 11.5 %, 14.5 %, 12.3 % and 13.2 % for 0.009 kg/s, 0.018 kg/s, 0.028 kg/s and 0.037 kg/s, respectively. The optimum thermal performance for Model-1 and Model-2 have been obtained for 0.037 kg/s and equal 82.3 % and 69.1 %, respectively. A substantial temperature difference has been found in Model-1 in comparison with Model-2. The highest outlet temperature of Model-2 is always lower than Model-1 for all mass flowrate. The enhancement in the thermal efficiency of Model-1 indicates that the use of the modified model has a considerable effect on the heat exchange efficiency.

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Performance analysis of single-pass solar air heater thermal collector with adding porous media and finned plate

Jan 20, 2023

Journal Energy Storage

publisher John Wiley and Sons Inc

DOI 10.1002/est2.447

Issue 25784862

Volume 5

The recent study encompasses a practical inspect on adding porous material above absorber flat plate having fins to improve the effectiveness of solar air heater (SAH) collector along with forced air circulation process. The efficiency of the altered model and conventional SAH system is compared at the same time to display the impacts of adding porous material. The model that used porous material is called Model-2, whereas the conventional SAH is called Model-1. The measuring data is collected in January 2021 in Iraq (Mosul city). Outcomes emphasize that the effectiveness of altered model is better than traditional model by 7% for all air mass flow rates values. The highest efficiency is obtained equal 67% for Model-2 and 60% for Model-1 for mass flow rate 0.02 kg/s. For all mass flow rate values, a substantially change in temperature is observed in altered system as compared to traditional system, where the exhaust temperature of Model-2 is higher than Model-1. The improvement in the effectiveness of Model-2 demonstrates that the employ of porous material has an extreme action on the heat exchange and subsequently heat transfer rate.

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Hybrid battery thermal management system of phase change materials integrated with aluminum fins and forced air

Apr 1, 2024

Journal Energy Storage

publisher John Wiley & Sons, Ltd.

DOI 10.1002/est2.625

Issue 25784862

Volume 6

Due to its high self-heat rate, most researchers have avoided using lithium cobalt oxide (LiCoO2) in their work, although, major car companies use it to power some car models because of its high-power density. A thermal management system benefits from phase change material (PCM) and serves as a reliable cooling system to ensure the safety, performance, and lifespan of Li-ion batteries. In this study, we conducted an experimental investigation of a new hybrid battery thermal management system (BTMS) using PCM combined with aluminum fins and forced air to enhance the cooling performance of Li-ion battery type 18 650 LiCoO2. Furthermore, the hybrid model's thermal behaviors are compared with other models that use only air or PCM for cooling. The cooling performance of different BTMS models was tested under a high temperature of 40°C and various discharge rates, as well as, various air velocities. The results demonstrate that the hybrid model effectively minimizes the battery heat accumulation and can reduce the maximum operating temperature by 1.5°C, 5.5°C, and 9.5°C compared to the air-cooling model and by 2.8°C, 5.1°C, and 16.1°C compared to the PCM model for discharge of 1C, 2C, and 3C rates, respectively. Furthermore, the maximum temperature difference within the battery pack did not surpass 3.1°C with our hybrid model. Moreover, the use of our model has a significant advantage in minimizing the air-cooling power consumption by 89%.

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Experimental comparison of the Li-ion battery thermal management systems using a new hybrid model of flat heat pipe coupled with phase change materials

Apr 20, 2024

Journal Journal of Energy Storage

publisher Elsevier Ltd

DOI 10.1016/j.est.2024.110963

Issue 2352152X

Volume 84

The usage of an effective battery thermal management system (BTMS) to achieve optimal lithium-ion battery operation and prevent thermal runaway is essential. The usage of heat pipes (HPs) is considered one of the most effective techniques to cool batteries due to its high thermal conductivity. In this study, a BTMS equipped with a new model of flat HP coupled with phase change material (PCM) is experimentally investigated. The new flat HP consists of a double circular grooved evaporator and a finned condenser. The thermal performance of the new model is compared with the pure PCM model, air cooling model, and the same HP without the PCM combination. Different BTMS models are examined using various discharge rates (1C, 2C, and 3C) and air velocities, at 35 °C ambient temperature. The results indicated that the new model displays a good cooling performance, especially at high discharge rates and it can provide better protection for the batteries. Where the new model can reduce maximum operating temperature

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Impacts of geometric configurations on performance of discharge coefficient and wall pressure of Venturi meter under high Reynolds number

Oct 1, 2024

Journal International Journal of Ventilation

publisher Taylor & Francis

DOI 10.1080/14733315.2024.2344992

Issue 4

Volume 23

The performance of discharge coefficient (Cd) and wall pressure of Venturi meter under various convergent and divergent cone angles have been experimentally investigated. Several models of tubes have been examined, where the tubes have been manufactured with two convergent angles (20° and 40°) and three divergent angles (7°, 11° and 15°). A pipe system along with ten tapping points distributed along the Venturi meter wall has been utilised to measure the static pressure. The examinations have been done for wide ranges of Reynolds number (Re). Results of Cd have been compared with the empirical solutions and they show a good agreement between them with a relative difference less than 3.5%. As Re is increased until Re = 15000, the results of Cd is substantially increased. Results display that the convergent angle has a less impact on Cd and a major influence on pressure drop as compared to divergent angle. Divergent angle has an inversely impact on Cd. The best value of Cd has been obtained when using the tube that has a convergent angle of 7° and divergent angle of 20°. Present results clearly demonstrate the necessity of choosing the required geometric parameters accurately while designing Venturi meter to achieve the optimum performance. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

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Solar air heater energy and exergy enhancement using a v-corrugated wire mesh absorber: An experimental comparison

Nov 15, 2024

Journal Energy

publisher Elsevier Ltd

DOI 10.1016/j.energy.2024.133136

Issue 03605442

Volume 309

In this paper, the energy and exergy performance of a double-pass solar air heater (SAH) using a novel model of a v-corrugated wire mesh absorber (CM-SAH) is investigated experimentally. The v-corrugated wires are adjacent to each other in one layer along the airflow direction to reduce the hydraulic resistance. Simultaneously, this arrangement increases the surface absorptance rate of solar radiation and expands the heat exchange area. To evaluate the performance of CM-SAH, a standard SAH having a v-corrugated absorber plate (CP-SAH) and the same configuration dimensions is compared with CM-SAH. The comparison is achieved under the same operating conditions and using different air mass flow rates of (0.01, 0.02, and 0.03 kg/s). The results show that the CM-SAH outperformed the CP-SAH in terms of thermal efficiency, exergy efficiency, and output air temperature. The maximum thermal efficiencies reach 87.3 % and 65.1 %, while the maximum exergy efficiencies reach 4.4 % and 3.4 %, for CM-SAH and CP-SAH, respectively. In addition, the thermal efficiency of CP-SAH decreased after midday while that of CM-SAH continuously increased.

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