Simulation Study of Thermal Comfort in Residential Building Types: The Case of Lokoja, Nigeria (Published)
Thermal comfort is an important factor for the design of buildings that offers comfortable indoor environment for the wellbeing of building occupants. There are several residential building typologies at different locations in the world. These includes bungalows, duplexes and block of flats. Despite previous studies on thermal comfort in Nigeria, there is a lack of research data on the performance of different building types, especially in terms of thermal comfort. Hence, this study evolved to investigate three popular types of residential buildings in Nigeria. The research outcome aims to provide data for theoretical evolution on the thermal behavior of these building types. The paper used dynamic thermal simulation, natural ventilation mode to analyze three residential buildings in Lokoja, Nigeria using hourly weather data for a period of 10 years. The simulation results showed that the annual operative temperature for the three cases were 33.360C, 33.620C and 33.650C. This revealed that there is no significant difference between the operative temperatures of the three case studies. However, there were marked differences between both the monthly and annual solar gains of the case buildings. The total annual gains for the three case studies were 24118.27kWh, 20497.90kWh, and 39493.09kWh. Although there was no significant difference in the performances of the case buildings, there performed differently in terms of both operative temperature and solar gains. The simulation results confirmed thermal discomfort in residential buildings in the study area. This calls for improvement in the design of residential buildings in the study area to enhance thermal comfort and reduce energy demand due to overdependence on mechanical cooling systems. This study has provided data that is expected to guide design professionals and other stakeholders in the building industry in their decisions regarding the thermal performance of residential building types in the study area and in similar climates.
Citation: Rajaa Jarallah Abdul Rahman, and Ahmed Khalid Ibrahim (2022) Modeling and Simulation of shroud Ed Wind Turbines to work in Iraqi weather conditions, European Journal of, Mechanical Engineering Research , Vol. 9, Issue 1, pp.1-11
This study provides an overview of renewable wind energy in Iraq and the possibility of deploying concentrated wind energy technologies to support power generation in agricultural fields. On horizontal wind turbines. The results showed that with the addition of the diffuser, the energy produced shows an increase, and the study also showed that the wind speed in Iraq reaches 8 m per second in the center and south of the country. The study presents wind energy activities in Iraq, and the Iraqi government’s attempts to use wind energy. Renewable energy in general, and wind energy in particular.
This study describes an integrated framework in which the basic elements of Aerospace Engineering (performance, aerodynamics and structure) and functional elements (suspension, visibility and production) are integrated and considered. In this study, a fully functional rotor system has been fabricated that can be used as one of the training resources for Aeronautical students. For making the rotor system, various parts of the system have been designed on Solidworks and complete mechanism has been simulated with ANSYS. System analysis has been done at various RPM’s and Angles of Attack (AOA). In terms of merit the right items have been selected and processed to provide them with the right shape. In terms of the design and implementation, various machines such as gas welding, arc welding, CNC milling and radial machinery have been used. Certain parts such as electric motors, linear actuators and loading cells have been used. All the fabricated components and electric motor, actuator, load cells are then assembled. This rotor system can produce less lift due to high dead weight and low power motor and having some safety issues.
Facility Location and Its Impact on the Environment: Using a Centralized and Decentralized Approach, a Case Study (Published)
There has been an increase in consumption of goods in the last century due to the rapid economic growth all over the world. Globalization has availed large streams of goods to meet this demand but the production, transportation, storage and consumption of these goods have caused environmental problems to emerge. Manufacturing companies are facing numerous pressures from the government and consumers to produce environmentally sustainable goods. The decision to set-up a plant is a strategic issue as the best facility location does not only ensure that the costs are minimized but also take care of the impacts on the environment. This paper presents a case of ABC Chinese steel manufacturing company operating in a centralized facility location approach and intends to evaluate the impact of a decentralized approach on the environment. A simulation of the two networks is run and the results reveal that the centralized approach is more suitable for this company as it is not only economical to them but it is also environmentally sustainable due to the lower carbon emissions produced by this model. The research concludes that facility location decisions greatly impacts the environment but the approach to adopt depends on the type of the product, mode of transportation and the choices of fuel.
Machine Learning Based Approach to Simulate Drone Dynamics Related to Figure of Eight Maneuvering Pattern (Published)
Drone will be a commonly use technology used by major portion of the society and simulating a given drone dynamic will be an important requirement. There are drone dynamic simulation models to simulate popular commercial drones. There are many proposed drone dynamic models with the base of Newtonian and fluid dynamics. Hoverer these models consist of many model parameters and it is impracticable to evaluate required model parameters to simulate a given drone. If there is a simple mechanism to built machine learning based drone dynamic model to simulate a any given drone then it is address most of the above issues. Figure of eight maneuvering pattern or its derivative is used in many activities in the domains of aviation, maritime and ground vehicle. Hence, proposed approach and conducted experiments presents the process of developing a machine learning based drone dynamics simulation related to a figure of eight maneuvering pattern
The problem is that the analogue television broadcasting will end in the year 2015. That is, any analog TV channels will not protected after this year. Switching entirely to digital technology and take advantage of the Internet protocols in broadcasting and various compression techniques become necessary. So researcher aimed to highlight the importance of digital and inevitable techniques to take advantage of online networks, leading to provide TV services over the Internet Protocol IPTV. The objectives of the research is to apply TV Internet protocol (IPTV) with VLC program, and Opnet modeler to simulate the IPTV system and measure system efficiency. The researcher used the experimental method and simulation program to conduct this research. It was found helpful to shift from analogue to digital broadcasting because it is efficient and reliable.
A Comparative Study of the Contingency Assessment of the Reformed Nigeria 330kv Power Network under Normal and Fortified Conditions (Published)
One of the most important requirements for effective performance of a power system network is to make the network secure against unanticipated outages. It is very important to be able to predict the extent of violations that can occur in the network in the event of unprecedented contingencies. Contingency Analysis is useful both in the network design stages and for programmed maintenance or network expansion works to detect network weaknesses. The weaknesses can be strengthened by transmission capacity increase, and shunt compensations at the buses. This work considers the simulation of single generators and transmission line outages so as to carry out a full AC load flow based contingency analysis on the Nigeria 330kv post-reform grid. The simulation results show severe bus violations with generator contingencies at Mambilla and line contingencies at Jos-Gombe and Damaturu-Mambilla lines. Under the same contingencies for the fortified grid, there were no violations on the network, indicating that the simulated fortification can be recommended for real time performance of the network.