Naseer T . Alwan - Academia.edu (original) (raw)

Papers by Naseer T . Alwan

Mathematical Problems in Engineering, Aug 25, 2022

Fuel additives from waste have been suggested to enhance low octane commercial gasoline in this s... more Fuel additives from waste have been suggested to enhance low octane commercial gasoline in this study. Four samples were prepared in addition to pure commercial gasoline and denoted as GF0, GF4, GF8, GF12, and GF 16 which refer to fusel oil addition ratio of 0%, 4%, 8%, 12, and 16% respectively. Engine speed was controlled and increased manually from 1000 rpm to 3000 rpm at an increment of 500 rpm. Design of experiments is used to indicate the optimum additive dosage through response surface method optimization. Obtained results show that increasing engine speed signi cantly impacts the engine brake power, brake-speci c fuel consumption, and brake thermal e ciency with a slight change for fusel oil ratio. Accordingly, it can be concluded that the maximum increase in output variables is statistically linked with the engine speed. e output response values at optimized conditions were 2.61812 kW brake power, 0.2431 kg/kW.hr brake-speci c fuel consumption, and 36.5303% brake thermal e ciency. Based on the P-value, ANOVA data indicate that engine speed was a signi cant factor in uencing output responses, while the fusel oil ratio was insigni cant. However, fusel oil ratio of 8% has a signi cant e ect on the brake thermal e ciency and BSFC.

Institution of Engineering and Technology eBooks, Dec 31, 2022

Case Studies in Thermal Engineering, Jun 1, 2020

The limited productivity of traditional solar still considers as one of the most prominent obstac... more The limited productivity of traditional solar still considers as one of the most prominent obstacles to their implementation. Thus, the main objective of this study is to improve traditional solar still (TSS) productivity in two successive stages. In the first stage, a rotating hollow cylinder is used within the solar still to increase the surface area of evaporation and reduce the boundary layer thickness of untreated water film. Three rotational speeds have been tested (0.5, 1 and 3 rpm). The second stage included the integration of an external solar collector with the modified solar still (MSS) to raise the basin saltwater temperature. From the analysis of experimental results, it is observed that the productivity increased with decreasing rotational speed of a hollow cylinder and the maximum value obtained at the lower speed (0.5 rpm). Furthermore, integrating outer solar collector results in further enhancement, where the productivity of freshwater observed to be 5.

Materials Today: Proceedings, 2021

Abstract Current experimental work studies the thermal performance of a flat plate solar water co... more Abstract Current experimental work studies the thermal performance of a flat plate solar water collector according to the weather conditions of the city of Ekaterinburg in Russia. All tests were carried within four months and four typical clear days were chosen for each month. Thermal efficiency, useful energy, and water temperatures at the inlet and outlet of the flat plate solar collector have been investigated in this study. The results were collected during summer and autumn have been analyzed to find out the effect of different weather conditions on the performance of the proposed flat solar water collector. The highest efficiency of the solar collector was recorded during midday when the collector receives the highest solar energy intensity and thus the highest rate of useful heat gained. The maximum efficiency observed by 66% in July compared to the other months included in the current study. The results showed good agreement between the previous studies and the current proposed solar water collector in terms of thermal efficiency.

International Journal of Low-carbon Technologies, 2022

The purpose of the study is to evaluate the thermal performance of the gas turbine unit represent... more The purpose of the study is to evaluate the thermal performance of the gas turbine unit represented by (K3) under actual weather conditions by applying the first and second laws of thermodynamics, the design production of the unit (283.6 MW) at standard conditions (1 bar) and temperature (15) Celsius, which included the analysis of the unit energy and available energy. Hence, to find out the weaknesses and losses in the system ChemCad simulation has been used to estimate the effects of external factors (ambient temperature, compression ratio and relative humidity) for a whole year on the performance of the turbine unit. Overall results showed that the maximum exergy efficiency was obtained in November; it was ∼37% when Ta was 19.39 • C. The maximum efficiency obtained at Ta equal to 19.39 • C, which was ∼37.67%. Higher ambient temperature increases specific fuel consumption (SFC). The results show that the SFC for the practical and program calculations increases with the increase in the temperature of the external environment and reached the maximum rate in the practical calculations in September (0.224) at 33.27 • C. Thus, it economically affects the price of power production. Moreover, the results showed that the combustion chamber occupied the first place for the destruction of available energy, and the results of energy efficiency and available energy were 39.20% and 30.83%, respectively.

Materials Today: Proceedings

Journal of Physics: Conference Series

This article discusses in detail the adiabatic models investigations of alpha Stirling engine wit... more This article discusses in detail the adiabatic models investigations of alpha Stirling engine with study the influence of performance factors; adiabatic analysis is a crucially effective method because it is close to the real and practical engines when compared to isothermal analysis. The numerical model was created using MATLAB software, an extremely useful tool for solving equations. The study includes two adiabatic analysis models: the ideal model, which considers heat transfer is the duty of the heater and cooler when the regenerator is ideal, and the simple model, which considers the loss and the transfer of heat between the regenerator matrix and the working fluid.

Applied Thermal Engineering

MATEC Web of Conferences, 2018

The present study aims to make a comparison of the thermal behaviour for various exterior Packagi... more The present study aims to make a comparison of the thermal behaviour for various exterior Packaging materials (Local or Imported) or a new proposed (a phase change material), which are used in covering the facades of buildings in Kirkuk city/Iraq. And thus know how much those materials effect on energy conservation (rationalization in energy consumption). In this study the focus was on making comparison of heat dissipation and power consumption (Save energy) when using the conventional and proposed materials and which of them has the greatest ability to withstand various environmental conditions. The study was carried out (from the beginning of January 2017 until the end of February, 2017) which this period represents the cold months in the year. (Where temperatures ranged from−2 to 15 °C) which within those months all facilities, buildings need to be heated. The thermal conductivity of various classical covering materials samples was measured and compared with the values of the oth...

Inventions, Oct 18, 2021

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

International Review of Mechanical Engineering (IREME)

IEEE Access

This article offers a flatness theory-based energy management strategy (FEMS) for a hybrid power ... more This article offers a flatness theory-based energy management strategy (FEMS) for a hybrid power system consisting of a supercapacitor (SC) and lithium-ion battery. The proposed FEMS intends to allocate the power reference for the DC/DC converters of both the battery and SC while attaining higher efficiency and stable DC bus voltage. First, the entire system model is analyzed theoretically under the differential flatness approach to reduce the model order as a flat system. Second, the proposed FEMS is validated under different load conditions using MATLAB/Simulink. Thus, this FEMS provides high-quality energy to the load and reduces the fluctuations in the bus voltage. Moreover, the performance of the FEMS is compared with the load following (LF) strategy. The obtained results show that the proposed FEMS meet the real load power under fast variations with good power quality compared to the classical LF strategy, where the maximum overshoot of the bus voltage is 5%. INDEX TERMS Hybrid power system, supercapacitor, Li-ion battery, flatness control theory, energy management system.

Electronics

The target of the current study was to review and analyze the research activities of previous stu... more The target of the current study was to review and analyze the research activities of previous studies on cooling techniques for thermal photovoltaic (PV) systems using phase-change materials. These materials have the ability to absorb and release certain amounts of potential heat energy by changing their state from phase to phase (solid–liquid) within a small temperature range. These materials have been used to regulate and lower the temperature, increase the efficiency, and extend the life of solar cells. A host of improvements have been made to phase-changing materials through the combined utilization of phase-change materials and fins in addition to nanoscale fluids to enhance electrical efficiency. When using PCMs, the thermal, electrical, and overall efficiency improved by 26.87%, 17.33%, and 40.59%, respectively. The addition of nanomaterials increased phase-change materials’ specific heat capacity and thermal conductivity, thus reducing the plate temperature and increasing th...

Bulletin of the South Ural State University series "Power Engineering"

Renewable energy resources for electrical generation are normally free but are not continuously a... more Renewable energy resources for electrical generation are normally free but are not continuously available due to their sporadic availability. Thus, hybrid connections of various kinds of energy are made to increase utilization of renew-able energy. This paper involves a design of a hybrid renewable energy system employing maximum power point tracking (MPPT) techniques. The hybrid system consists of solar PV panels, a small-scale wind turbine, and a thermoelec-tric generator (TEG) module. Four MPPT techniques are examined in this research. They are the incremental conductance (IC) algorithm, fuzzy logic controllers (FLC) using 25 and 35 rules, and an interval type 2 fuzzy logic con-troller (IT2FLC). Each MPPT technique is tested in the system to determine which has the best maximum power tracking, stable operation, and efficiency. All of the studied energy resources are connected to a DC linked bus. The voltage of this bus is supplied to a three-phase inverter. Inverter output voltag...

Actuators

The direct-current (DC) motor has been widely utilized in many industrial applications, such as a... more The direct-current (DC) motor has been widely utilized in many industrial applications, such as a multi-motor system, due to its excellent speed control features regardless of its greater maintenance costs. A synchronous regulator is utilized to verify the response of the speed control. The motor speed can be improved utilizing artificial intelligence techniques, for example fuzzy neural networks (FNNs). These networks can be learned and predicted, and they are useful when dealing with nonlinear systems or when severe turbulence occurs. This work aims to design an FNN based on a model reference controller for separately excited DC motor drive systems, which will be applied in a multi-machine system with two DC motors. The MATLAB/Simulink software package has been used to implement the FNMR and investigate the performance of the multi-DC motor. moreover, the online training based on the backpropagation algorithm has been utilized. The obtained results were good for improving the spee...

Scientific Reports

Impacts of blending fusel oil with gasoline on fuel combustion have been investigated experimenta... more Impacts of blending fusel oil with gasoline on fuel combustion have been investigated experimentally in the current research to evaluate engine performance improvement and exhaust emission. Tested fuel include F10, F20 (10% and 20% of fusel oil by volume) and pure gasoline as baseline fuel have been used to operate 4-cylinder SI engine at increasing engine speed and constant throttle valve of 45%. The present results reveal a shorter combustion duration and better engine performance with F10 over engine speeds with maximum value of 33.9% for the engine brake thermal efficiency. The lowest BSFC of 251 g/kW h was recorded at 3500 rpm engine speed also with F10. All blended fuel have almost similar COVIMEP. Less NOx emission was measured with F10 at 4500 engine speed compared to gasoline. However, CO emissions reduced while higher CO2 was observed with introducing fusel oil in the blend. Moreover, HC emission increased an average by 11% over speed range and the highest value was achiev...

Inventions

Thermoelectric generators (TEGs) are devices that convert heat into electricity. This paper is ab... more Thermoelectric generators (TEGs) are devices that convert heat into electricity. This paper is about the design of a Maximum Power Point Tracking (MPPT) technique for a TEG module. The module is built using 204 TEGs connected in series. It is connected to the load through a DC/DC boost converter. The MPPT technique used in this work is the Interval Type 2 Fuzzy Logic Controller (IT2FLC). To verify its performance, the IT2FLC is compared with a traditional Perturb and Observe (P&O) MPPT algorithm in the case of power and voltage response at steady state, load switching, and through various ranges of temperature differences (ΔT). The TEG module is modeled and the whole system is simulated successfully using MATLAB SIMULINK R2017a.

International Journal of Low-Carbon Technologies

This study aims to evaluate the performance of a flat plate solar water heater (SWH) theoreticall... more This study aims to evaluate the performance of a flat plate solar water heater (SWH) theoretically and experimentally. The thermal performance of the SWH was predicted using Fortran 90 programming language. SWH was designed as a square shape with dimensions of 110 cm length, 120 cm width and 10 cm depth and tested by integrating with a modified solar distiller to increase the water temperature in the basin at a constant mass flow rate of 1.2 l/min. The tests were conducted under the weather condition of Yekaterinburg city, Russia, from June to September of 2019, and a typical day was chosen for each month (19 June, 17 July, 22 August and 15 September). The study revealed that the highest efficiency of the solar water collector obtained at the highest value of the intensity of solar radiation at mid-day. The maximum thermal efficiencies achieved on 17 July of 2019 were ~67% and 66% based on theoretical and experimental analyses, respectively. A simultaneous increase in the water temp...

Journal of Physics: Conference Series, 2021

The solar parabolic dish water heater is highly efficient but has limited hours of work only when... more The solar parabolic dish water heater is highly efficient but has limited hours of work only when sunlight is perpendicular to its surface. Therefore, this work aims to continue the work of the solar parabolic dish in the daytime using a dual tracking system, depending on the geographic location of the system (longitude and latitude angles) and using the C # programming language. To verify the effect of the dual-axis solar tracking system, the current study considered two types of solar parabolic dishes, the first was fixed, and the second was a rotating dish (by the dual tracking system). It was observed that the water temperature at the outlet of the tracking type solar water heater is 22% higher than that for the fixed dish type; this means that the proposed system has improved the temperature of water in the heat exchanger. Therefore, the highest water temperature value of about 51.4ffiC was at the outlet of the heat exchanger for the tracking type at 1:00 pm, while the temperat...

Applied Solar Energy, 2020

The limited productivity of conventional solar still is considered as the main obstacle that rest... more The limited productivity of conventional solar still is considered as the main obstacle that restricts their implementation. Hence the objective of the current study is to enhance the productivity of conventional solar still (CSS) by increasing the evaporation area using a rotating hollow drum. Many factors have been considered in the investigation of the enhanced solar still (ESS) productivity; including environmental factors and operation factors such as drum rotational speed. Three rotational speeds have been used in the experimental tests (0.5, 1, and 3 rpm) during three typical days 12, 13, and 14 June 2019. All tests done for 12 h from 8:00 am to 20:00 pm. Study results showed that the productivity enhanced by about 161% with 0.5 rpm, 111% with 1 rpm, and 75% with 3 rpm rotational speed compared to conventional solar still. Accordingly, the productivity increased with decreasing rotational speed and the maximum value obtained at the lower speed (0.5 rpm).