http://dspace.ewubd.edu:8080/handle/123456789/2494 2026-04-05T23:50:47Z http://dspace.ewubd.edu:8080/handle/123456789/2562 Design and Implementation of an Open-Loop Solar Tracking System Khan, Rafid Adnan; Mahmood, M. Rezwanul Solar tracker, by directing a collector face towards the sun, can maximize energy extraction from solar system. There are different ways of solar tracking. In this thesis work we aim towards developing an open loop solar tracker that tracks the sun about single tilted axis with an optimum tracker rotation. From time, date and location inputs taken into our device, we have calculated solar position using PSA (Platforma Solar de Almería) algorithm. From the calculated data we have optimized the single axis tracker rotation for maximum received solar radiation. We have implemented the optimum tracker rotation with a DC motor mechanically coupled with a linear multi turn wire-wound potentiometer. The potentiometer which is calibrated with respect to rotation angle sends a position feedback to the control unit. Depending on the given position feedback the control unit terminates the rotation at the required position (representing the respective optimum rotation angle) and goes through a definite interval. Thus the sun is tracked at certain intervals. In the design the robustness and reliability of the system has been emphasized. Finally we have experimentally analyzed the accuracy of tracking rotation and improved energy harvesting by tracking. The errors in angle range within ±5°. On a 30% overcast day, we have obtained 21% more energy by the designed tracking panel system with respect to a fixed panel system. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh. 0012-01-01T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/2497 Simulation Study on the Effects of Changing Band gap on Solar Cell Parameters Rifat, Mostofa Amir; Khan, Mohammad Imtiaz Morshed Solar cell is treated as a wonderful source of renewable energy. Researchers are much interested in this source of renewable energy because of being environment friendly. Solar cell technology is much advance and day by day it is being enriched. In this thesis, we study the numerical analysis of solar cell parameters; such as open circuit voltage, short circuit current, maximum power, fill factor, and external quantum efficiency as a function of observer layer band gap. These parameters are known as basic parameters of a solar cell. In this thesis, band gap of absorber layer of a solar cell structure is selected to be varied, and the impacts of varying band gap on the basic solar cell parameters are presented. ATLAS SILVACO is used to construct and simulate the CIGS solar cell structure. Standard AM1.5 spectrum for incident photon is used for this analysis. The characteristic of external quantum efficiency with respect to input photon wavelength is also studied for different band gap of absorber layer. MATLAB is used to plot different characteristics of desired study. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh. 0004-01-01T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/2496 An Investigation of the Performance of Law Doped 100-nm Thick P-type Polysilicon Nanowire Yasmin, Rubiya; Jan, Muktadir Imam; Shifat, Tanvir Alam This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh. 0004-01-01T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/2495 Home Automation System with Remote Access through Web Server Islam, Md. Merajul; Siddique, A.E.M Obeydullah; Rahman, Mojibur In our homes, we have to control our appliances for our comfort. As most of the controlling are done manually, a lot of power is wasted every day if sometimes we forget to switch-off any appliance, which is a very common phenomenon. If we control home appliances through a remote access, then we can easily abrogate the problem. We have designed a system where appliances can be controlled through a web server. This system is also helpful for people who are physically disabled, as the system can be accessed through cell phone or computer connected to the internet. The proposed system has three sub-systems, i.e. (1) hardware for appliance control, (2) interface between hardware and web server and (3) web based server.We are using Arduino in the hardware level to control appliances. To work as an interface between the server and Arduino, we have developed an application in Python programming language. The web server serves up a website; we used PHP programming language to design this website through which we can control and also show the on/ off status of home appliances. The appliances are connected with an Arduino board and the Arduino board is connected with a local server (i.e. pc). The local server is communicating with the web server through internet. Through the server, a client gets the authority to monitor and control the on/ off states of the appliances. In order to ensure the security of the system, we have implemented password protection for the clients on the website. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh. 0004-01-01T00:00:00Z