Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
12
30
Sustainable Impact Region as an Introduction to Architectural Education Development (A View and Practical Study on Mansoura Department of Architectural Engineering Strategy).
1
15
EN
Alaa
Mohamed
Shams Aldein Aleshi
Assistant Professor., Architectural Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
arabeskal_arch@yahoo.com
10.21608/bfemu.2020.126504
<strong>Although agreeing that developing architectural education is a must to suit future thinking in Egypt and the need to activate concepts that have become contemporary as Sustainability and Globalization. However, developing ways are still points of contention between different trends of architectural education and dealing with them as independent points that have their own architectural style and architectural culture. The research represents a neutral vision that studies how to achieve sustainabiliiy from two main axes: cultural privacy without detachment.:Region of educational impact in universities 2:communicating with modern architectural thoughts communication This research aims to: </strong><br /> • Confirming local universities role in serving community and developing local environment. <br /> <strong>Activating sustainable thinking in architectural education through studying projects, topics, and research elements of postgraduate studies. The study concludes with scientific recommendations and practical suggestions to activate sustainable region concept and its effect on the strategy of architecture department by establishing an integrated regional database for the problems, potentials constructions development opportunities, and future development elements of impact region to be a comprehensive reference for educational projects of undergraduates and also to be an integrated plan for scientific research for postgraduales. </strong>
https://bfemu.journals.ekb.eg/article_126504.html
https://bfemu.journals.ekb.eg/article_126504_52e62505b0d67a572134cf002dbd5e9c.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
11
30
Effect of Developed Technologies on Actuating the Concept of Sustainability (An Analytical Study of the Architectural Education Environment).
16
29
EN
Alaa Mohamed
Shams ElDein
ElAishy
Dept. of Architecture, Faculty of Engineering, ElMansoura University., Mansoura., Egypt
Saad
Makram
Saad
Dept. of Architecture, Faculty of Engineering, ElMansoura University., Mansoura., Egypt
10.21608/bfemu.2020.126508
<strong>At the end of the 20th century, humankind have made successive progress towards civilizational and scientific communication Digital and electronic applications have become a basis of civilizational superiority in all fields of life after they exceeded the stage of trial. Now, the more realistic question we face is: how d we as users of Sustainable ly advanced systems react positively? </strong><br /> <strong>The paper focuses on the architectural education after the incapacity of the traditional concept to face the knowledge flow and the informatic revolution which affects labor market. The extent of failure to apply the concept of Sustainability appeared clearly in architectural education. From the beginning of that kind of education it depended on the ideas and philosophies current in every age and linked to the recent scientific and material ach<em>i</em>evements. In Egypt, the contemporar<em>y </em>fact o<em>f </em>architectural education still depends on traditional ideas and rules while the labor market relies on the most up-to-date technologies of age that modern mechanics and contemporary electronic education p < strong>rograms cake available considering them the fundamentals of the educational process success. Besides, it is necessary to give students the absolute freedom for the individual innovation talents to become clear. </strong><br /> <strong>What asserts th</strong>is is that the present classification of subjects in the Eg<strong>yptian Universities does not adequately focus on actuat</strong>ing these basics at the time when electronic education becomes a n<strong>ecessity and </strong>not mere welfare The afore-mentioned electronic education represents respect of the individual abilities <strong>and extraordinary cap < /strong>acity to penetrate spatial, timed, and social obstacles in the educational field in <strong>general and the archit</strong>ectural education in particular. The application fields of architectural education are <strong>numerous <em>s</em></strong><strong>u</strong><strong>c</strong><strong>h </strong><strong>as designin<em>g</em></strong><strong><em>, p < /em></em></strong><strong>reparin<em>g </em>tri-dimensional sketches </strong><strong><em>a</em></strong><strong><em>n</em></strong><strong>d models, imitation sy<em>st</em>em, and </strong>the <strong>vacuum forming in addition to information system </strong>and the educ<strong>ational process management. Other fields are also apparent s</strong>uch as the electronic dialogue councils<strong>, imaginary classes</strong>, and other sides of education <strong>from afar which were applied in many internati</strong>onal Universities. In addition, n<strong>umerous researches were made to evaluat</strong>e them which asserted the ability of these technologies to raise the scientific and skillful <strong>standard f</strong>or students. As a result, this confirms the necessity to actuate these systems in the architectural <strong>educatio</strong>n in E<span style="text-decoration: underline;">gy</span>pt beginning with putting subjective amendment for their current use in architecture <strong>departments </strong>in the E<span style="text-decoration: underline;">gy</span>ptian univ<strong>ersities. </strong><br /> The theme o<strong>f study was tackled a</strong>ccording to the following methodolo<span style="text-decoration: underline;">gy</span>: <strong>- Observing cur</strong>ricula, subjects, and the ways of teaching in some Egypti<strong>an Universities. - The electronic educat</strong>ion and developed technolo<strong>gies in architectural education. </strong>- The study of abilities and fields of applying electronic education theories on architectural education - Towards a Sustainable electronic environment of architectural education. Throughout this s<strong>tudy we can conclude a number of results indicating different inability in the averag</strong>e of using computer technology in the architectural education on the level of possibilities, teaching curricula and techniques, and the architectural application fields. This failure is due to a number of <strong>economic, organizat</strong>ional, and educational factors that the <strong>research seeks to study in the framework of a Sustainable strate<span style="text-decoration: underline;">gy </span>to </strong>develop the architectural education in Egypt through an <strong>electronic environment.</strong></strong>
https://bfemu.journals.ekb.eg/article_126508.html
https://bfemu.journals.ekb.eg/article_126508_1429010375e8ea538390f7cb05cde4d0.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
12
30
Hydraulic Calibration of Pipe Network Model Using an Improved Genetic Technique.
1
21
EN
A.
S.
El-Ansary
Professor of Irrigation & Hydraulics Engineering Department., Faculty of Engineering., Cairo University., Egypt
Abd El-Razek
Ahmed ElSayed
Zeidan
Prof., Irrigation & Hydraulics Dept., Faculty. of Engineering., EL-Mansoura University., Mansoura., Egypt
Mahmoud Mohamed
Abd El-Aziz
Ahmed El-Gamal
Prof., Irrigation & Hydraulics Dept., Fac. of Engrg., EL-Mansoura University., Mansoura., Egypt
Hamdy Ahmed
Abd El-Latief Abd El-Latief
El-Ghandour
Assistant lecturer, Irrigation & Hydraulics Dept., Faculty. of Engineering., EL-Mansoura University., Mansoura., Egypt
10.21608/bfemu.2020.126532
<strong>This research paper exhibits the development and calibration capability of a computer optimization code, called SO-OPTIM. This code copes with several problems concerning water distribution networks which include: new design, rehabilitation, calibration; optimal scheduling of pumps, optimal operation of pump stations in the presence of water elevated tanks, and optimal pressure regulation. These problems are treated using a powerful genetic algorithm optimization technique which consists of a nonlinear objective functions subjected to both linear and non linear constraints. Different modifications were carried out in the simple genetic algorithm. The mentioned code links the optimizat<em>i</em>on <em>m</em>odel and a hydraulic solver which applies the principles of a new technique used for pipe network analysis in steady state conditions. The proposed code is applied in two different water distribution networks. The first one is a hypothetical network with synthetic calibration data and the SO OPTIM code is applied to perform extended period calibration. The second network is a real water distribution system of Damnhour city, Egypt, with actual data and field measurements and in this case the code performs steady state calibration.</strong>
https://bfemu.journals.ekb.eg/article_126532.html
https://bfemu.journals.ekb.eg/article_126532_a0ac79bdad5fe3b4e7d37373df4cc7aa.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
11
30
Behavior of Reinforced Concrete Columns Strengthened Using CFRP Sheets under Sustained Loading.
22
31
EN
Hamdy
K.
Shehab El-Din
Professor of Reinforced Concrete., Structural Department., Faculty of Engineering., Zagazig University., Zagazig., Egypt.
Said
M.
Abd-Alla
Professor of Reinforced Concrete, Structural Dept., Faculty of Eng. Zagazig University., Zagazig., Egypt
Ahmed
S.
Eisa
Structural Dept., Faculty of Eng. Zagazig University., Zagazig., Egypt
10.21608/bfemu.2020.126513
<strong>This paper investigates experimentally the behavior of axially and laterally loaded square reinforced concrete columns wrapped with CFRP sheets with and without sustained loading. The experimental work includes twelve large scale square columns with CTOSS section 200x200 m<em>m </em>and 2500 m<em>m </em>height. The parameters to be investigated are the percentage of sustained loads (40% and 80% of the ultimate load), and the lateral loads (equivalent to 5% and 10% of the axial load). The columns are kept loaded, until being tested up to failure under static axial compressive load in addition to the different values of the lateral l<em>o</em>ads. </strong>
Column,strengthening,sustained loading,fiber-reinforced polymers (FRP)
https://bfemu.journals.ekb.eg/article_126513.html
https://bfemu.journals.ekb.eg/article_126513_a5cc2bc1c762043a9f5ae4d7bb8810ac.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
12
30
Loop Control and Tuning in Distributed Control System Using Fuzzy Controller.
1
11
EN
M.
Abdel-Geliel
Electrical Eng. and Automatic Control Dept., College of Eng. & Tech., Arab academy for science and technology, Alex., Egypt.
A.
Khalil
Electrical Eng. and Automatic Control Dept., College of Eng. & Tech., Arab academy for science and technology, Alex., Egypt.
10.21608/bfemu.2020.126542
<strong>In this paper, the designed schemes for two fu<em>zze</em>y controllers, employing the scaling factor tuning, are proposed. The first fuzzy logic controller is a normalized controller used to control the system. The tuning for the input and output-scaling factors of the first one is done through (le second fuzzy controller (the supervisory controller). This combination is used to appropriately determine the control s<span style="text-decoration: underline;">ig</span>nal of the process. The supervisory fuzzy controller tunes the normalized fuzzy controller based on the model reference adaptive control technique. The great advantage of the proposed method is that, a supervisor as a fu<em>z</em>zy controller to tune the scaling factor of a normalized fuzzy controller can be used to supervise many control systems. The simplicity and modular structure of the controller makes it is more suitable to be applied to control most control loops in the distributed control systems (DCS). The normalized fu<em>zz</em>y controller and the supervisory fuzz<em>y </em>controller are organized with specific experience information about the controlled systems. The proposed (fu<em>zzy </em>controllers are applied experimentally to control an experimental process, which simulate an LPG process. The proposed controller is applied to two different control 100ps, temperature and level, where the controller gains are selected based on the process conditions and limitations. A comparison among scaling factor manual tuning, supervisor fuzzy and conventional adaptive fuzzy controller is done to verify the effectiveness of the proposed design. The results show that in the last case the system is forced to follow the desired response.</strong>
Normalized fuzzy controller,supervisor fuzzy controller,scaling factor tuning,and DCS systems
https://bfemu.journals.ekb.eg/article_126542.html
https://bfemu.journals.ekb.eg/article_126542_50806aa12ef619f070f9613b12f54565.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
12
30
A Proposed PVPS Simulink Model Suitable for Direct Coupled AC Loads.
12
21
EN
Magdy Mohamed
Ali
El-Saadawi
Dept. of Electrical Engineering,
Faculty of Engineering Mansoura University, Egypt
Mohamed Adel
Rateb Mohamed
El-Sayes
Dept. of Electrical Engineering,
Faculty of Engineering ., Mansoura University., Mansoura., Egypt
M.
F.
Al-Hamdan
Public Authority for Applied Education and Training Kuwait
10.21608/bfemu.2020.126547
<strong>In order to develop a PV system, it needs to be either tested in a laboratory based power system model or to be simulated using a simulation program like Simulink. In fact, PV simulations provide good understanding of PV performance. The effect of many PV parameters can be studied and analyzed by simulating the proposed model. This paper presents a proposed PVPS Simulink model suitable for direct coupled PV-AC load system. The model consists of PV generator, DC-DC converter, maximum power point controller, DC-AC inverter and capacitor bank DC link as energy storage system. The DC link is used also to maintain balance between the DC power and the AC power transferred to the load. The entire system components are designed and a Matlab-Simulink model is developed and simulated to validate the optimum design of them. Measurements are taken at each stage of the system to test, verify and validate the design. Simulations results verify the functionality of PV generation systems with a resistive AC load.</strong>
PV model,DC-DC converter,dc-ac inverter model,Maximum power point tracker
https://bfemu.journals.ekb.eg/article_126547.html
https://bfemu.journals.ekb.eg/article_126547_065aa062b2aa09ea39a5a7b8deb74d94.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
11
30
Analysis and Enhancement of Transient Stability in Different HVDC Configurations.
22
27
EN
A.
A.
Lotfy
AAST & MT, Alexandria, Egypt
I.
Bedir
Tanta University, Egypt
G.
E. M.
Ali
Tanta University, Egypt
10.21608/bfemu.2020.126554
<strong>The performance of the High Voltage Direct Current transmission system "HVDC" is defined from a transient stability perspective making it possible to issue adequate corrective actions with suitable extent according to the actual transient condition. Transient originating scenarios in HVDC systems were simulated and the system's stability performance was accordingly analyzed. Analysis included the effect of sudden application and removal of di<em>ff</em>erent load types at different control modes, breaking the parallel AC line in single infeed AC systems or the line connecting two inverters in multi infeed systems, and short-circuit originated voltage dips. </strong>
Stability, HVDC,SIF, SIFAC, MIF, ESCR
https://bfemu.journals.ekb.eg/article_126554.html
https://bfemu.journals.ekb.eg/article_126554_f77474b3e8545fafa51674b0011f95f6.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
11
30
Electrochemical Treatment of Wastewater Containing Cyanide and Zinc.
1
14
EN
M.
Hanafy
Chemical Engineering Dept., Faculty of Engineering, Cairo University, Giza, Egypt.
10.21608/bfemu.2020.126560
<strong>A study was carried out to investigate the feasibility of using a packed bed electrochemical reactor with low-through porous graphite electrodes to remove either cyanide and<em>/</em>or zinc ions simultaneously from wastewater. The effects of cell current density, flow rate, pH and inlet concentration on removal efficiency and current efficiency of either cyanide ion or zinc ion and combination of both ions removal were studied. It was found that the removal efficiency of cyanide ions increases with cell current density, pH and feed flow rate. Several cell arrangements were investigated. It was found that the vertical arrangement of cells is better than the horizontal arrangement. For zinc removal it was found that removal efficiency of zinc ions increases with cell current density. For a combination of both ions it was found that removal efficiencies of zinc and cyanide increase with flow rate, current density and inter concentration. Current efficiency of zinc removal increases with current, flow rate and zinc ion concentration but remains constant with pH change. </strong>
cyanide,zinc,electrochemical cell,flow-through porous electrodes,Wastewater
https://bfemu.journals.ekb.eg/article_126560.html
https://bfemu.journals.ekb.eg/article_126560_470aaf1b91c3854e25a9acb8af956d0d.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
11
30
Thermodynamic Functions and Kinetic Models for Methelyne Blue Adsorption on Corn Straw Pulp.
15
24
EN
Mohamed Mohamed
Abd EL-Kadder
El-Halwany
Mathematical and Physical Engineering Department, Faculty of Engineering, Mansoura University., Mansoura., Egypt.
10.21608/bfemu.2020.126572
<strong>Methylene Blue (MB) in aqueous solutions was subjected to color removal by the adsorption technique onto corn straw pulp (CSP) as a biosorbent waste agricultural material. Results obtained indicate that the removal efficiency of Methylene Blue at 25°C exceeds 91% and that the adsorption process is highly pH-dependent. The optimum pH lies between 5 and 9. The amount of Methylene Blue adsorbed from the aqueous solution increases with the increase of the initial Methylene Blue concentration and temperature. Smaller adsorbent particles help in increasing the percentage removal of Methylene Blue. The results fit the BET model for adsorption of Methylene Blue on corn straws pulp, verify the assumption molecules could be adsorbed in more than one layer thick on the surface of the adsorbent. A comparison of kinetic models (pseudo first-order, the pseudo second order, Elovich and intraparticle diffusion kinetic models) at different conditions showed that the pseudo second-order kinetic model correlates the experimental data well. Van't Hoff equation was used to evaluate the thermodynamic parameters (AH, AS and AG) for the interpretation of the adsorption process. The values of the thermodynamic parameters indicate that all adsorption processes are endothermic, and this is in agreement with the increasing adsorption capacity with temperature. The process of removal of MB by Corn straw pulp is a spontaneous one. </strong>
https://bfemu.journals.ekb.eg/article_126572.html
https://bfemu.journals.ekb.eg/article_126572_60971d32e4aa1485a8b86090eec66a18.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
11
30
Natural Convection between a Pair of Elliptical Cylinders in Blunt and Slender Situations.
1
15
EN
El-Desouki
Ibrahim
Eid
Associate Professor., Mechanical Power Engineering Department., Faculty of Industrial Education., Suez Canal University, 43515 Suez., Egypt.
10.21608/bfemu.2020.126582
<strong>In this paper, natural convection heat transfer between pairs of elliptical cylinders having different elliptical ratios in blunt and slender situations was studied experimentally and numerically. Three pairs of elliptical cylinders having the same axes ratio of 2 and elliptical ratios of 0.662, 0.866 and 0.968 were cut using CNC wire-cut machining. The tests were carried out by keeping the inner cylinder at a constant heat flux while cooling the outer one. The effects of v<em>e</em>r<em>ti</em>cal eccentricity, horizontal eccentricity and angle of attack of the inner cylinder on natural convection for both blunt and slender situations of each pair were stated, Empirical correlation was deduced within acceptable uncertainty for the experimental results. A validated numerical CFD model was conducted with the case study to clarify the thermal behavior of air inside the elliptical annulus space between the two elliptical cylinders. Compatible and satisfactory to the conscience agreement was found in the comparison among present and corresponding previous works. In the vision of the comparison among the results of present work, it was found that the vertical eccentricity can enhance natural convection by about 15% than the concentric case, the horizontal eccentricity can enhance, natural convection by about 10% than concentric case and slender situation leads to about 30% - 40% enhancement in natural convection than the blunt situation for the same elliptical ratio. </strong>
Elliptical cylinders,blunt,slender,Eccentric,angle of attack and CFD modeling
https://bfemu.journals.ekb.eg/article_126582.html
https://bfemu.journals.ekb.eg/article_126582_9d182960246b5004a4f6c0aaf6629858.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2021
12
01
Study of Heat Pipe Performance with Water/ Water-Based Nanofluid.
34
45
EN
Mohamed
Ghassoub
Saafan
Mechanical Power Engineering, Faculty of Engineering, Mansoura University, Egypt
mgmousa@mans.edu.eg
Elsayed
Mohamed
Elshafei
Assistant Professor., Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
eelshafei@mans.edu.eg
Osama
Mohamed Hamed
Ali Ebraheem
Mechanical Power Eng. Dept., Faculty of Engineering, Mansoura Univ., Mansoura, Egypt.
10.21608/bfemu.2009.126741
<strong>Thermal performance of a flat heat pipe cooling system is experimentally investigated. Pure water and Al<sub>2</sub>O<sub>3</sub>-water based nanofluids are used as working fluids. An experimental setup is designed and constructed to study its performance under different operating conditions. The effect of working fluid, filling ratio, volume fraction of nano-particle in the base fluid, and heat input rate on the average heat transfer coefficient and in turn the average Nusselt number are investigated. Total thermal resistance of the heat pipe for pure water and Al<sub>2</sub>O<sub>3</sub>-water based nanofluid are also predicted. Correlation is obtained to predict the influence of Prandtl number, fillin<span style="text-decoration: underline;">g </span>ratio and dimensionless heat coefficient, K<sub>q </sub>for Nusselt number. Results showed that the average heat transfer coefficient, using Al<sub>2</sub>O<sub>3</sub>-water based nanofluid enhanced by 10.5% up to 37<em>% </em>compared to that of pure water, dependin<span style="text-decoration: underline;">g </span>on filling ratio and volume fraction of nano-particles in the base fluid. The experimental data are compared with the available literature and discrepancies between results are discussed.</strong>
Flat Heat Pipe,Thermal Performance,Nanofluids,Cooling of Electronic Devices
https://bfemu.journals.ekb.eg/article_126741.html
https://bfemu.journals.ekb.eg/article_126741_348c81702c563d020f1067328d3ebe3d.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
12
01
Health Care Controlling System Using Advanced Smart Pill and Finger Ring.
46
59
EN
S.
A.
Abouamer
Vice Dean of High Institute for Engineering and Technology at Al Obour
M.
I.
Youssef
Dean of High Institute for Engineering and Technology at Al Obour
10.21608/bfemu.2020.126745
<strong> Home health care is a hot research field in the 21 century. It can reduce the risky and critical cases that may happen to elder and disabled patients. It also improves life quality of patients in their familiar environment. On the other hand, home health care will reduce the medical expense. With the help of the sophisticated communication techniques, widespread applied computers and microcomputers, and micro electro-mechanical systems, as sensing elements and actuators, home health care network has become a reality. Many researches went for excellent applicable results that are used nowadays in any hospitals. These hospitals are equipped with what is called "hospital monitoring centre", which receives a 24 hours precise measured data from the patients at their home directly. In this paper, a modified Smart Pill (SP) and a finger ring are used to complete health care controlling systems. The complete system is very important in situation when the patients are in an uncontrolled state. The block-diagram of the already existing health care system and the block-diagram of the modified health care system will be shown. Patients and elder people swallow these pills everyday and live normally. In case of emergency when they are disables, doctors in the hospital or centers while monitoring them can sent a coded signal that is received by the pill to release the precise amount of required medicine for the case. This step saves the time up to 30 minutes (according to European Standards) of sending the care ambulatory team to the patient location. </strong>
Smart Pill (SP),Microfluidics,Micropump,Micromixer,Microvalve,and Microchannel
https://bfemu.journals.ekb.eg/article_126745.html
https://bfemu.journals.ekb.eg/article_126745_cc58add45edee90dcaddcf36c307a4d6.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
12
01
A New Program to Design an Alpha-Type Stirling Engine Using Elbow-Bend Transposed-Fluids Heat Exchangers.
60
72
EN
A.
A.
El-Ehwany
Mechanical Power Engineering Department., Faculty of Engineering., Ain Shams University., Cairo., Egypt.
G.
M.
Hennes
Mechanical Power Engineering Department., Faculty of Engineering., Ain Shams University., Cairo., Egypt.
E.
I.
Eid
Mechanical Power Engineering Department., Faculty of Industrial Education., Suez Canal University., Suez., Egypt.
E.
El-Kenany
Workers University., Tech. Development Dept., Tanta., Egypt.
10.21608/bfemu.2020.126751
<strong>In this work, the elbow bend heat exchangers were suggested to be used as a heater and a cooler in an alpha type Stirling engine. Elbow bend heat exchanger is a bank of tubes arranged in a quadrant either in line or staggered with different normal and parallel pitches. Eight of the suggested heat exchangers of different dimensions were tested experimentally for steady flow (in a previous research by the same authors). The experimental results were correlated for heat transfer and pressure drop. In the present research, two parallel pistons on a common crankshaft alpha Stirling engine were designed to use elbow bend heat exchangers as a heater and a cooler. The heating fluid flows inside the tubes of the heater, the coolant flows inside the cooler tubes, while the gas circuit fluid (working fluid) flows past the tubes in both of them. A computer program was prepared to analyze the working fluid cycle in the vision of Schmidt theory and it was solved numerically by the program. After that the effect of heat transfer and pressure drop were taken into consideration. Upon calculations, the most suitable values of each of the stroke/bore ratio, the crank phase angle between the hot and cold pistons and the speed range were found out for nitrogen as a working fluid. In a comparison between the proposed engine and practical ones by the literature, it was found that the proposed engine delivers higher power per unit swept volume per unit temperature difference between the heat source and sink in addition to higher values of the efficiency. </strong>
Stirling engines,Elbow bend heat exchangers,Alpha Stirling engine
https://bfemu.journals.ekb.eg/article_126751.html
https://bfemu.journals.ekb.eg/article_126751_be593f1300cc9683834b0f01dbfe9bc3.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
12
01
Design and Construction of a Two Axes Sun Tracker Prototype with a Real Time Controller and Hybrid Stepper Motors.
73
82
EN
Helmy
El Sayed
Gad
Prof. at Mechanical Power Engineering - Faculty of Engineering - Mansoura University
he_gad@yahoo.com
Safya
M.
El-Gayar
Senior researcher, Agric. Eng. Res. Inst., A. R. C, Giza, P.0.256, Egypt
safelgyar@yahoo.com
Hesham Helmy
Gad
Computers and Systems Department, Faculty of Engineering, Mansoura University, El-Mansoura 35516, Egypt
10.21608/bfemu.2020.126761
<strong>The sun tracking became of high necessity for increasing the efficiency and reducing the cost of photovoltaic systems and solar concentrators. This system is used for maximizing the normal incident direct solar radiation on the surface of these devices. This is essential in solar water pumping for irrigation and power generation. In the present study, a new prototype şun tracker (heliostat) is designed, constructed and tested. This sun tracker tracks the sun on two axes and uses a real time control unit and hybrid stepper motors. The control unit uses a low cost microcontroller compared to the other controllers. The microcontroller provides a large number of input/output pins for controlling the hybrid stepper motors and the LCD screen. Also, its internal memory size and the processing power are high making it the most suitable device for solving solar energy equations in real time. The proposed sun tracker is seen to be simpler in operation and more reliable than the PLC, microprocessor and e<em>l</em>ectro-optical controlled systems. Results show that this şun tracker has a good accuracy for tracking the sun and that the experimental data are closely fit the theoretical results. Hybrid stepper motors with their advantages and the control system are suitable for these applications. Thus, this sun tracker is also seen to be suitable for the photovoltaic panel used for solar pumping, power generation and the dish type solar concentrators.</strong>
design,Construction,Real Time,two axes,sun tracker,hybrid stepper motors
https://bfemu.journals.ekb.eg/article_126761.html
https://bfemu.journals.ekb.eg/article_126761_2a44c96514c47961c377e4e9e1df6ae2.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2020
12
01
Natural Convection Heat Transfer from a Heat Sink with Hollow/ Perforated Circular Pin Fins.
83
95
EN
E.
A. M.
Elshafei
Department of Mechanical Power Engineering, Mansoura University, Mansoura, EGYPT
eeshafel@mans.edu.eg
10.21608/bfemu.2020.126775
<strong>Experiments were performed on natural convection heat transfer from circular pin fin heat sinks subject to the influence of its geometry, heat flux and orientation. The geometric dependence of heat dissipation from heat sinks of widely spaced solid and hollow/perforated circular pin fins with sta<span style="text-decoration: underline;">gg</span>ered combination, filled into a healed base of fixed area is discussed. Over the tested range of Rayleigh number, 4.5 x 10<sup>6</sup>≤Ra≤1.65 x 10<sup>7</sup>it was found that the solid pin fin heat sink performance for upward and sideward orientations shows a competitive nature, depending on Rayleigh number and generally shows a higher heat (transfer coefficients than those of the perforated/ hollow pin sin ones in both arrangements. For all tested hollow/perforated pin fin heat sinks, however, the performance for sideward facing orientation was better than that for upward facing orientation. This argument is supported by observing that the augmentation factor was around 1.05-1.11, depending on the hollow pin diameter ratio, DVD, Meanwhile, the heat sink of larger hollow pin diameter ratio, DID offered higher heat transfer coefficient than that of smaller Di/D<sub>O</sub> for upward orientation, and the situation was reversed for sideword orientation. The heat transfer performance for heat sinks with hollow/perforated pin fins was better than that of solid pins. The temperature difference between the base plate and surrounding air of these heat sinks was less than that of solid pin one and improved with increasing Di/D<sub>O</sub>.</strong>
energy efficient,Natural convection,Round/ hollow pin firs,Heat sinks,Orientation effects,Electronic cooling
https://bfemu.journals.ekb.eg/article_126775.html
https://bfemu.journals.ekb.eg/article_126775_23aff7f1e7a98b4088c0652720777306.pdf
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
2735-4202
34
4
2021
12
01
Augmentation of Solar Still Performance Using Flash Evaporation.
16
33
EN
A.
M.
El-Zahaby
Mechanical Power Department., Faculty of Engineering., Tanta University., Egypt.
A.
A.
Kabeel
Mechanical Power Department., Faculty of Engineering., Tanta University., Egypt.
kabeel6@yahoo.com
A.
I.
Bakry
Mechanical Power Department., Faculty of Engineering., Tanta University., Egypt.
bakry100@yahoo.com
S.
A.
El-agouz
Mechanical Power Department., Faculty of Engineering., Tanta University., Egypt.
O.
M.
Hawam
Workers University., Mansoura., Egypt.
10.21608/bfemu.2021.200047
<strong><span>A new design of a stepped solar desalination system with flashing chamber is experimentally investigated. The main objective of the investigation was to study the performance of step—wise water basin coupled with a spray water system by augmenting desalination productivity through using two air heaters. The effect of using the spray system for seawater is investigated experimentally at different velocities of the water sprays holder and Flow rates on the performance of the solar still in a previous article by the authors [ll. in the present article the effect of the inlet raw water temperature (at motor speed of 250 rpm and watt flow rate of`•¢l l/h) and the power consumed by the two air beaters (at both 100 and 250 rpm and water flow rates3.635 4.0 and 9.333 l/h) on the performance of the proposed solar system are investigated. It was found that the productivity and performance of the system were significantly positive dependent on both inlet impure water temperature and the power consumed. They decrease with the increase of inlet impure water temperature. At 250 rpm the productivity and efficiency increases with the power consumed to a certain limits after which they begin to decreases gradually while at l00 rpm the productivity and so the efficiency decreases with the power consumed gradually</span></strong>
Solar still,flash evaporation,Enhancement Productivity,Spray system
https://bfemu.journals.ekb.eg/article_200047.html
https://bfemu.journals.ekb.eg/article_200047_7a99f18fe368df97e253c380247fc13a.pdf