Browsing by Author "Asfa Javed"

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    Energy efficient conference hall
    (University of Management and Technology, 2011) Amber Naz; Asfa Javed; Iram Qamar
    The Project Energy Efficient Conference Hall mainly emphasizes on efficient use of energy resources by using different automation functions. In this controller based design, different types of sensors are used to make the hall automatic and intelligent. The arrival of a first person is detected at the door of the hall and main light is turned on automatically. Individual lights are controlled with respect to number of persons and their positions. Moreover AC or heater is turned on or off if temperature exceeds or decreases from specific limits. The project also involves a display outside, for continuously updating the number of people present inside the room, to avoid congestion. IR sensors are used for detection of objects to make the project more cost effective.
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    Evaluating mobile wimax in vehicle-to-grid system for communication between aggregator and vehicle
    (University of Management and Technology, 2016) Asfa Javed
    The deployment of Electric Vehicles (EVs) has been proved as a very attractive option due to a great feasibility in transportation cost, reduction in carbon emission, and decrease in fuel dependency. However, this deployment threatens power grid operations due to varying temporal and spatial patternsof EVs' demand. Hence, for mainstream success, the capability to handle the potential extra load has become a major factor for power grid. For this integration it is necessary that the consumers and the power grid should coordinate with each other in harmony. Vehicle-to-Grid (V2G) technology can be used for this purpose by interconnecting Electric Vehicles with the power grid by either level peak demands or by strangling their charging rate. One of the key elements in V2G architecture is Aggregator. This entity plays a very crucial role to provide an interface between a large group of EVs and the power grid. Thus, there is a need of two established wireless communication links in a V2G system, the first is the communication link between the control center and the Aggregator, and the other one is the communication link between the Aggregator and the Electric Vehicles of its assigned area. This thesis aims to provide an investigative evaluation of the best suitable wireless access technology on the link between Aggregator and Electric Vehicles. For this purpose detailed communication architecture of V2G system has been explored to understand the exact role of Aggregator and its relationship with Electric Vehicle. Also the candidate wireless access technologies have been surveyed that can be employed in V2G communication system. Then mobile WiMAX has been selected for performance evaluation on the communication link between Aggregator and Electric Vehiclesin a multipath mobile fading environment. Itis a 4G technology that provides an infrastructure of wireless transmission that allows low maintenance costs as well as fast deployment. Physical layer of mobile WiMAX was simulated in MATLABSimulink, under considerations of Aggregator-to-Vehicle (A2V) communication channel. Due to the time-variant nature of the channel, all possible circumstances against the worst scenarios are tested to quantify the system's performance. The results obtained from the simulator were satisfactory and show that the mobile WiMAX is a suitable wireless technology that can provide a cost effective broadband internet access solution for A2V link. This research work is an original contribution to the available literature and will prove helpful in implementation of the system to turn the concept into the reality, which points out a possible solution for cost-effective and robust communication between Aggregator and Electrical Vehicle.
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    Formulation of an electric equivalent circuit of pemfc and its behavioral studies under steady state and transient conditions
    (2012) Asfa Javed; Abdul Aziz Bhatti; Mashood Nasir
    In this paper electric equivalence model is formulated for the constructional and operational features of a Polymer Electrolyte Membrane Fuel Cell (PEMFC). The proposed model is capable of explaining the behavior of PEMFC in both steady state and transient modes of operation.. For the efficient designing of fuel cell related applications it is highly desirable to model the electrical output of fuel cell in terms of its internal electrochemical dynamics. The proposed model includes the phenomenon like activation polarization, ohmic polarization and mass transport effect. An analogical electrical circuit is formulated by taking these phenomena into considerations. Within acceptable limits, the effects of load variation on output voltage, efficiency and fuel flow demands are also investigated. The static and dynamic characteristics obtained through simulations are compared with the standard available data. Simulation results show that the model can be used in PEM fuel cell distributed generation related control studies.