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Name Usman Riaz
Registered 2015
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I would like to briefly tell you about my educational background.I completed my Bachelors of Mechanical Engineering in 2015 from University of Engineering and Technology,Taxila Pakistan with a GPA of 3.53/4.Currently I am doing my Masters of Mecahical Engineering at Central Michigan University. My favorite subjects are thermal sciences,Heat Transfer, Mechanical design and Renewable Energy Systems.I have worked on solar cooling systems at my bachelors level and want to continue my work on renewable energy,because the speed with which conventional energy resources are depleting is a point of concern for engineers and scientists.Renewable Energy resources appeared as best alternative of the conventional energy resources.The second advantage of the renewable energy is that it is environment friendly.Although renewable energy systems are still in research phase with limited usage worldwide as efficiency of Renewable Energy Systems are not on optimistic level.Research is in progress to achieve maximum efficiency for such systems and I also want to become part of such efforts. At undergraduate level,I along with my group investigated the possibility of using adsorption cooling system under the climatic conditions of Taxila ,Pakistan.Solar Radiation readings were taken experimentally.A computer program was developed to simulate the operation of 2-Bed Silica Gel/Water Adsorption System as well as CPC Solar Collectors. Mathematical model of the system was coded in MATLAB and solved by the MATLAB ODE solver with the help of NIST database REFPROP.Cyclic Cooling Capacity,Cycle and System COPs through the operation hours were estimated.Effect of cycle time on the average daily cooling capacity, cycle and solar COPs were studied.

Here is the abstract of my earlier work in Solar Energy.

                               Performance Investigation of Adsorption Cooling System – A case study for Taxila

Pakistan as one of the Sun Belt countries has the advantages of high solar radiation intensity and long daily sunny hours. Therefore it might be interesting to investigate the possibility of using adsorption cooling systems working under climatic conditions of this region. This project presents a theoretical study on the performance of solar powered silica gel/water adsorption chiller using solar radiation data of Taxila. This project presents a transient model of a solar adsorption cooling system. A computer program is developed to simulate the operation of a two bed silica gel/ water adsorption cooling system as well as CPC collectors. Mathematical model of the proposed system is coded into MATLAB and solved by the MATLAB ODE solver ode15s with the help of NIST database REFPROP. Cyclic cooling capacity, cycle and system COPs through the operation hours is estimated. Effect of cycle time on the average daily cooling capacity, cycle and solar COPs is studied. Cyclic cooling capacity of about 12-15 kW is typical of the proposed Adsorption Cooling System and a cyclic COP of about 0.5 can be achieved with this system. Solar powered adsorption cooling systems have the advantages of using clean energy and environmental friendly refrigerants. Moreover using of solar energy technologies may reduce the electricity consumption especially at peak hours. Solar energy which is abundant and clean, presents one of the promising solutions for the conventional energy resources limitation. This study may prove to be a vital step towards utilization of renewable energy resources in Pakistan.

My research project in Masters is related to design and simulation biomedical implants. The title of my project is "Study of Effect of Surface Treatment on Mechanical Properties and Degradation Rate of Magnesium Alloy Stents-An FEA Approach to simulate Experimental Effects". Here is the abstract of my Masters project.

Magnesium Alloys found appreciation in the field of Biomaterials because of their ability of Biodegradation. The biodegradability of Magnesium Alloy Implants significantly reduce the surgical procedure. The only problem associated with the Magnesium Alloy Implants is the short degradation time providing insufficient scaffolding .In this study I will work on the magnesium alloy stent and will investigate its performance on the basis of mechanical properties and degradation time. My project will focus on the surface treatment of magnesium alloys by anodization. On the basis of experimental results a surface treated magnesium alloy as our stent material will be selected. Stent model will be designed in SolidWorks 3D CAD Software. The stent will be simulated in ANSYS for the mechanical behavior and degradation study. Continuum Damage Model will be adopted for degradation study. The purpose of this study is to investigate the mechanical response and effect on degradation time of stent by using the surface treated magnesium as stent material.

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