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CAREER EPISODE 1 Introduction CE1.1	The first career episode will explain the project that I did from January 2009 to December 2009 at Auchi Polytechnic. The project was the design and fabrication of the mobile incinerator, and I was working as mechanical Workshop Assistant Technician with assistance from my colleague who was also attached to the workshop. Auchi Polytechnic is the leading polytechnics in Nigeria located in Auchi Edo state in southern Nigeria. My duty in this project was to come up with a design of the mobile incinerator to serve small scale household needs. Background CE1.2	Auchi Polytechnic University is among the leading polytechnics in Nigeria found in the Nigeria city. The incinerator is equipment that I used in the reduction of the waste volume and minimizing the dangerous substance found in the waste through burning. The energy produced during combustion of waste can be converted into useful energy. The mobile incinerated that I did as my project is the answer to the waste menace that had affected my households in Nigeria. This is because the incinerator will move around the estate hence eliminated the need to transport the waste to the dump site.

CE1.3	The goals of this career episode were to design the mobile incinerator that could be used by the residential neighborhood and market areas in Ekpoma, Edo State, Nigeria. It was also supposed to study different types of the solid waste produced in this area and to come up with a management plan to solve the issue of solid waste menace. The last objective was to come up with the actual design of the mobile incinerator that was enough to serve an average of one household per day. The design that I proposed had an advantage since it could be moved from one household to another and it was cost efficient, environmentally friendly and with less associated hazards and risks.

CE1.4	I worked on this project with other professions like the electrical engineers who were responsible for the electrical work. Other people who I worked with in this project were the technicians and supervisors. Below is the organization structure that was being used on this project at Auchi Polytechnic, it shows my position as Mechanical Workshop Assistant Technician

Figure 1. The organization structure used at Auchi Polytechnic CE1.5	Below are the roles and responsibilities that I played while working at Auchi Polytechnic as the mechanical Workshop Assistant Technician on this project. •	Design, fabrication, and testing of the mobile incinerator to ensure it met the design specifications. •	Preparation of the general arrangements (GA) drawings and fabrication drawings using AutoCAD •	Coordinate to ensure everything was done as per design specifications and tasking the team members and subordinates. •	Preparation of the documentations and presentation like the weekly and monthly reports, budget among others •	Organizing the meeting between different stakeholders and ensure everything went as expected and as planned. •	The collection of the mobile incinerator design information like the amount of waste produced in different households, road network to the household and the available truck to pull the incinerator around.

Personal Engineering Activity CE1.6	I was assigned this project by the Auchi Polytechnic to come up with the incinerator that would have been used by the surrounding community as a way of community social responsibility. Thus after doing extensive research, and consulting different stakeholders, I settled on the mobile incinerator that was to be mounted on a semi-trailer. This was to be move around the household area where incineration was to be done on site. This unit was suitable because the areas were starting the process of combustion because there was no existing data on amount of waste produced CE1.7	I started my design by coming with assumptions and design specifications for example. I made the assumption that the type of waste being produced was of one type and it would be separator by the household regarding toxic and nontoxic since the incinerator was only meant for incineration of non-toxic waste. I also made an assumption that all the waste is dryer and it would be easy to burn without the need of the dryer. Lastly, I made an assumption that the entire household was producing nearly the same amount of waste daily CE1.8	The first design that I did on the incinerator was the design capacity to enable it to burn the waste. The design capacity then I selected was 20kgs of waste for every 30 minutes. The source of fuel for burning the waste was biomass. Thus I did the calculation of heating and burned chamber, and I did it as follows. I used the following equation to calculated the dimension of the heating chamber (Mass of waste) X (Heat of the product of combustion of waste per kg of waste) = (mass of biomass needed to burn the waste) x (Heat of the product of combustion of biomass per kg of biomass). I was able to use another formula in determining the remaining dimensions of the incinerator which was height and cylindrical diameter. CE1.9	The second design that I did was determination thickness of the insulation thus to calculate the minimum thickness of insulation, and I made an assumption of the safety factor of 1.5 which I used it to multiply with the temperature expected inside the incinerator which was 2100 K hence the final value that I used was 3150K.I then used below equation to determine the thickness of the insulation; q = k x 2 x  x h x (Ti – To) 2.3 log (ro/ri) Where; 	Ti = inside temperature To = outside temperature ri = inside radius ro = outside radius h = cylinder’s height K = thermal conduction of insulating material

CE1.10	The standards that I followed during implementation of this project was the NFPA 82 2014 edition that gave the standard of the minimum fire protection required for the installation, construction, and maintenance of the waste incinerator. Another code that I followed was the Environmental Pollution Control Regulations 2000 that gives the minimum amount of impurities to be released to the environment from incinerators. CE1.11	The challenge that I encountered during this design was the waste that was not burning completely as required. I did an investigation on the moisture content and other areas but nothing improved. On further investigation, I found that the there was partial combustion of the waste reason being the lack of enough supply of oxygen/air that supports combustion. I further found out that the actual cause was small drag fan that was used to force air into incinerator's combustion chamber. Therefore I did the calculation and included enough safety factor and purchased the fan with the correct specification from the vendors. I installed the fan and tested it, and it was working as planned.

CE1.12	To improve my design on this project I enroll for the short online course on the Autodesk CFD that was necessary software in performing the simulation of the performance of this machine. I also did the research online and at the Polytechnic Library where I learned various aspect and skills on how to improve the use of Autodesk CFD.

CE1.13	I used three major softwares in this project to ensure the optimum design was achieved. For example, I used AutoCAD for drafting whereby I did the general assembly and fabrications drawings of the components. The Software was the ANSYS that I used in analyzing the strength of the incinerator cabin and supporting frame. I also used the Autodesk CFD to simulate the behavior of burning of wastes in the incinerator.

CE1.14	I ensure there was safety while I was working on this project, for example, I planned all the work accordingly to include the safety procedures like inspecting the team to ensure everybody was in the safety gear like helmets, safety boots, and the gloves. I also guarantee the safety of environment by making sure that there was complete combustion of the waste in the incinerator hence releasing less toxic fumes to the environment.

CE1.15	I was responsible for the preparation of the documentations during the implementation of this project, for example, I prepare weekly and monthly reports that were used in the management of the progress. I also used this documentation as the means of passing information to the stakeholders like management among others. In addition, I prepared and presented this documents in English which was the official language being used at the Auchi Polytechnic

CE1.16	This is the project that I did while working as the Workshop Assistant Technician and I had subordinates whom we formed a strong team that we worked together in an organized manager. With assistance from my colleague who was also attached to the workshop. The teamwork spirit that we developed with my colleagues led to a timely manner management and implementation within the budget since everyone was given their task and assisted one another

CE1.17	This project was tested and commissioned on time and met all the specifications. My skills in the project management helped me in ensuring the project was completed within the specifications, time and the budget. The project was executed within the standards stipulated and also there were no cases of injuries that is associated with the poor place regarding works safety Summary CE1.18	The objective of this project was achieved successfully despite the challenge that I encountered during its implement. But thanks to the solid teamwork, my leadership skills and my research skills that helped me in using innovative ideas. After completion of this project, commission, and testing of its performance, I won the confidence of the management. The project gave me immense experience that has helped me in the improvement of experience. My contribution to this project was significant since I was the major player and the leader in design and project implementation.

Career Episode 2 Introduction In my second Career episode, I would discuss the project that I did from July 2012 and December 2012while working at Braimah Engineering as the Mechanical engineer on full time basis. The project was the design and construction of a portable refrigerator that was expected to improve storage of perishable foods and reduce the reliance of the imports. Braimah Engineering is located in the Benin-Okene Road Auchi, Edo State, in Nigeria. I played the lead role in the design and production of the refrigerator components before the final assembly. Background Braimah Engineering is one of the many engineering companies Edo State, in Nigeria Refrigerator is an house appliance that is used to store perishable goods and sometimes called Fridge. It consists of the heat pump and an insulated compartment. The purpose of the fridge is to keep the temperature of the insulated chamber below the ambient temperature of the room. The low temperature in the fridge prevent the reproduction of the bacteria hence the refrigerator reduces the spoilage. Portable refrigerator that I design and produced in my design was light in weight and consisted of two compartments, the freezer and the chiller. The main objectives of this project are to come up with the design of the portable refrigerator that can help to improve the storage of the food. It also keeps the temperature of the stored food lower thus prolonging its lifespan and reduces wastage. Another important aim of my project was to reduce the reliance on the imported refrigerators thus reduce the expenses in terms of the foreign exchange. The project also aimed to improve the design and production of the portable refrigerator that can be used easy. I was also supposed to test and evaluate its performance after production. This project was also to prove that the local manpower was capable of producing portable refrigerator. This project was quite complex thus I was not alone during implementation. There were electrical and chemical engineer whom help me in fixing their respective parts. The electrical engineer was responsible for all the electrical works while chemical engineer was responsible to the coolant that was used in the project. Below is the organization hierarchy that was used in this career episode. It shows my position as the Mechanical supervisor reporting directly to workshop supervisor. Figure 1. The organization structure used at Braimah Engineering Company Below were my roles and responsibilities while working on this project as the while working at the Braimah Engineering Company Design, and fabrication of the of portable refrigerator Planning for the project implementation through preparation of implementation schedule, budget and methodology Production of the General arrangement drawings (GA) and fabrications drawings using AUTOCAD that were used for both fabrication of the parts and assembly Preparation and presentation of the documentations that was paramount to project implementation. Coordinating all the activities in the project that included tasking, planning and implementation

Personal Engineering Activity Before the start of this project I had to plan for the project to ensure the smooth implementation, some of the things that I did include collecting the relevant information like the operating temperatures of the freezing and chilling compartments, the total volume and the weight of the refrigerator. I planned for both time and the budget that was required to complete the project. After I had planned everything, I met with the stakeholders like field assistant among others to brainstorm and make the final touches before the project was implemented The main components of the portable refrigerator was the Aluminum Plate Metal, Main frame Insulation Material, Condenser, Capillart tube, Evaporator, Refrigerant and the Compressor. On this project the parts the I did the design and I am going to discuss is the freezing compartment and the chilling compartment that was used for port lowering and freezing the products The first design that I did on this project was the freezing compartments. The main consideration was the product’s that was to be kept in this compartment thus I considered the volume of the sachet of pure water that was to be kept in the freezer. To determine the total volume I used the number of sachets that was to be kept in the freezer and multiply by the volume of individual sachets. I then used the total volume as the volume of the compartment and considering the size of the materials that were available I was able to determine the dimension of the compartment that is length, width and height. The second design that I did was on the chilling compartment where the products will be made very cold by temperature reduction but not reaching the freezing temperature. This compartment was to carry more sachets as compared with the freezing compartment because it consumes less energy. This compartment was to carry 40 sachets of pure water. Thus with the volume of individual sachet, I was able to determine the volume of the compartment and subsequently determined the dimensions of the compartment namely length, width and height. In both the designs I was able to use the best insulation materials to protect the compartments from being affected by the external environment. The calculation that I did on this project was the calculation of the heat load of the refrigerator that was needed to come up with the power rating of the condenser, compressor, Refrigerant’s mass ﬂow rate and selection of other important parts for the refrigerator .For the determination of the heat load of the product (water) kept in the freezing compartment I used below formula. Qpw = MCθ + ML Where Qpw = Product heat load of the freezing Compartment in Kilojoules (kj) M = Mass of the Product (Water) in Kg θ = Change in Temperature C = Speciﬁc heat capacity of the product (water) L = Latent heat of Fusion Also Density = mass/Volume Mass = Density x volume

I followed standards in my project that governs the design of the refrigerators so as to improve its acceptability in the market. I followed the 42 U.S.C. 6291(16) that gave rules and regulations governing the production and distribution of the refrigerators. The other important code that I followed was the Code of Federal Regulations a 10 CFR 431.66.tha required all the refrigerator designs to meet certain energy consumption level. These codes also ensure that my designs met all the design specifications that include energy efficiency and protection of the environment. This codes was of great help because I didn’t have to come up with the standard’s that could have consumed allot of time. The challenge that I encountered on this career episode was the poor energy efficiency that was exhibit by the design during the testing process. This prompted me to do the audit of all the materials that I had used to construct the refrigerator. After analysis I found out that the insulation materials that I had used was of poor quality. I order other insulation materials from the supply and after using then I was able to operate the refrigerator within the required efficiency.

Softwares were useful on this project for example I used AutoCAD to draw both the general arrangement (GA) and the fabrication drawings. Important software was the Autodesk CFD that I used to do the simulation of changes in the temperature and movement of the coolant in the piping system. The last important software that I used was the ANSYS that I used to do the finite element analysis (FEA) used to analysis the frame of the fridge. Team work was the key to achievement of the goals of this project on time; I formed a strong team that helped me the projects implementation. The team spirit enables us to share Ideas and views on the design of the portable refrigerator. I also distributed all the duties to subordinately equally in order to empower them and complete the project on time. I was responsible for the preparation of all the documentations during the implementation of this project. These documentations included the project execution plan, project budget, daily progress reports and weekly progress reports. I did this documentation in English language that was an official language used in the company. I also did the presentation of these documents when we were having our weekly meeting to brainstorm the project execution plans. For the presentation purpose, I used the PowerPoint, laptop and I project that I used to display the information. Safety was paramount during the implementation of this project, to reduce injuries and damage to both tools and materials. I ensure that everyone who was working on this project was in the protective gear by wearing safety boots, gloves and helmets. I had also devoices procedure whereby every person was to be inspected and ensure they were always using the protective that was supplied to them. After completion of design and fabrication of the parts, I did the assembly and did the test; the results were wonderful since the portable refrigerator met all the design specifications. Everyone was happy on the achievement of our team and the Braimah Engineering company management was happy. The results from this project are the clear show of my management skills that ensured all the resources were well utilized. Summary This project was completed on time because of my good research skills and teamwork that I developed at during the implementation of this project. I encountered challenges but through innovation and research, I was able to complete it successfully. The goals of the project were achieved within the budget and time frame and I was able to come up with portable refrigerator. My contribution towards this project since I was responsible for all major areas in the design of the project

CAREER EPISODE 3 Introduction CE3.1	In my third career episode, I will explain the project that I did while working as the Assistance Field Engineer at Lukman Engineering Company that is located at Shop 49, Pedro Police Station Lagos Nigeria. The project was the design of the water closet cleaner to improve the toilet hygiene of homes, industries, and other public buildings. The project took place between  January 2014 and August 2015.I was responsible for the design, fabrication and assembly of the water closet cleaner and I was reporting to the Field Engineer. Background CE3.2	This project is the design of the water closer that will address the challenges of coming into contact with germs while cleaning the toilets. It also reduces the time was taken and energy used during the cleaning process. The design of the water closet cleaning machine consisted of the following vital parts the D.C motor, small hose rubber pipe [SHRP].Others were the control panel, the D.C motor, the bolt and nuts, the cover, Soap water tank [SWT], the brush, the springs and the frame that consisted of the pillar, movable handles, support, and rotating legs. I did the design of these parts before doing the fabrication and finally assembling them to form the water closet cleaner. This machine eliminated the act of cleaning the toilet using powder and wearing the gloves soap as to scrub the bowl and under the rim using a scrubby sponge. CE3.3	The main objective of this project was to come up with a solution for cleaning the toilets without coming into contact with the gems. The project involves design and fabrication of the parts and assembling to for the water closet cleaner that would be easy to operate. The other objective of this project was the analysis of its performance to ensure it working as per the design specifications. The key performance indicator of this project was the improved cleaning capacity, reduction of contact between the user and the gems and reduced time of cleaning. CE3.4	This project was quite complex; thus I had other people whom we worked together, for example, I worked with both electrical engineer and other technicians. Below is the organization structure that was used in this project. It shows my position as the Assistance Field Engineer reporting to the Field Engineer

Figure 1. The organization structure used at Lukman Engineering Company CE3.5	As the assistance Field Engineer, I was responsible for ensuring that the project was done successful below were my responsibilities while working on this project. •	Design and fabrication of the parts to be used in the assembly of the water closet cleaning machine like the brushes, shaft among others •	Preparation of documentations related to this projects that includes the weekly progress report and monthly reports •	Analysis of the performance of the water closet cleaning machine concerning efficiency and the operation •	Ensuring all the safety procedures and precautions were followed by everyone who played important role in the project •	Ensuring the quality of the work done was up to the standards by following set codes that govern the design and production of the water closet cleaning machine Personal Engineering Activity CE3.6	Before the start of the project, I did the research on the different methods cleaning the clock rooms without coming into contact with gems. Thus I come up with water closet cleaner; thus I did research on it as a way of preparation. I collected all the relevant information that was important in the project like the standards and codes that I was to follow. Finally, I held meeting with the stakeholders with the aim of brainstorming and planning the project implementation. CE3.7	The design that I did on this project was the brush and brush handle, and the cleaning parts are achieved by the use of three brushes, one scrubbing the floor while the two are to scrubbing the sides of the toilet. The reason why I choose to have two brushes scrubbing the sides of the toilet is to achieve the required balance on the handle and avoid exerting the handle with the twisting force. The forces that I had to consider were the bending loads on the rods connecting the motor to the pillar and the rods that support the pillar. CE3.8	The first calculation that I did on this project was during the design where I determine the torsional force that acts on the support. The torsion is the twisting that is caused by the torque, thus in my design the torque was due to the motor. Since the pillar was made of the hollow shaft. I determine the specification of the shaft that is internal and external diameter using the following formula Tmax = (π / 16) τmax (D4 - d4) / D     Where; Tmax = maximum twisting moment (Nmm) τmax = maximum shear stress (MPa) D= external diameter of the shaft/pillar d=internal diameter of the shaft CE3.9	The challenge that I encountered during the design was that I faced difficulty in doing the finite elements analysis (FEA) using the Autodesk Inventor. This challenge was the weakness because it meant that I was not able to do the simulation of the water closet cleaner will on use. To solve this challenge, I enrolled for a short online course on the Autodesk Inventor. After the training, I was able to do the FEA modeling where I was able to study the behaviors of the equipment in real-time. CE3.10	The softwares that were paramount in this project were the AutoCAD and Autodesk Inventor. The AutoCAD software was paramount when I was designing the fabrications drawing for the shafts, pillars and other parts where I did then send the drawings for the fabrication. Autodesk inventor was useful when I was doing the FEA (finite element analysis) to model the behavior. CE3.11	I follow standards and codes during the design of the water closet cleaner, and the first one was the Americans with Disabilities Act of 1990 "ADA” that gave me the specifications on this to include in my design for the benefit of the handicapped people. Thus the design consisted of the easy to operate configuration that could easily and comfortably used by disabled people		CE3.12	While working at this a career episode, as the Assistant Field Engineer, I worked with a team of technicians and electricians who assisted me in completing this project on time. The electrical technicians were responsible for all electrical work that includes power connection while the mechanical technician was my subordinate who assisted me in all the mechanical engineering work. We worked as a team, and I was the team leader throughout the implementation of this project.										CE3.13	During this project, I participated in training that aimed and improved my ability to implement the project. For example, I enrolled for a short course online on Autodesk Inventor. I also did the research in the internet and company library where I studied different water closet cleaner designs that were done before. I also did research by contacting some of my friends who were well conversant with design mythology thus we exchanged useful ideas. CE3.14	I prepared different types of documents during the implementation of this project for example; I made weekly progress report that I used to track the progress of the project. I also made the daily progress report and month reports’ used the English language in this reports that were the official communication language since everyone understood it. I held meeting with my head who was the field engineer where I did the presentation of these projects reports. For the purpose of presentation, I used Microsoft PowerPoint and the project CE3.15	Safety was crucial during the implementation of this project, for example, I was always in the protective gear with my colleagues to protect our self from any form of injuries. I was always in safety boots, gloves, and helmets. I also considered the safety of the cleaning operator whereby the electric motor that I used was waterproof; this was to provide protection against electric shock if water comes into contact with cables. The last safety precaution that I observed with my project was the safety of the operator where I made the provision for the safety switch in a place that was easy to access so that in case of an accident it would be easy to switch electric supply off. CE3.16	In conclusion, this project was implemented and completed within the specified time and budget hence it was successful. I managed to gain a lot of experience that would be important in my future endeavors. The leadership skill that I also gained would be very useful in my next assignment. All the persons whom we worked together were jubilant. Summary CE3.17	This project was completed on time despite various challenges that I encounter. Thus the main objectives of this project were achieved. The major contributing factor for the success was my research skills, hard work and teamwork that I developed in the project. My immediate supervisor and other stakeholder were happy with the workmanship and the achievement in the design of the water closet cleaner. My contribution towards the project was significant since I played all the major roles in this project like planning, implementation, and monitoring.

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