http://103.99.128.19:8080/xmlui/handle/123456789/462 Mon, 05 Oct 2026 13:36:56 GMT 2026-10-05T13:36:56Z http://103.99.128.19:8080/xmlui/handle/123456789/597 Title: Shade Tolerant Crops Plantation on Farmland under Solar PV Panel Authors: Chowdhury, Raihan; ID:, 19MET001F Abstract: Agro-photovoltaic (APV) technology addresses the challenges of land-use competition by enabling simultaneous solar power generation and food production, thus mitigating potential economic, ecological, political, and social conflicts in Bangladesh's future energy landscape. This study investigates the growth and yield of shade-tolerant crops, including tomato, brinjal, green chili, lettuce, aloe vera, cucumber, snake-gourd and rose flowers, under shaded and non-shaded conditions. Key plant growth parameters such as height, number of leaves, flowers, fruits, and fruit weight are measured to evaluate crop performance in the APV system. The Land Equivalent Ratio (LER) is utilized to compare the efficiency of food and energy production in APV systems against traditional monoculture farming, identifying optimal crops for APV integration. Energy generation from a stand-alone APV (SAPV) system is measured and simulated using PVsyst software to optimize system performance and maximize power output. Electrical shading analysis is conducted to improve the synergy between crop growth and energy production. Results indicate that brinjal, lettuce, aloe vera, cucumber, and rose flowers exhibit yield advantages in the APV system, while green chili and snake gourd show disadvantages, and tomato demonstrates no significant difference. The SAPV system achieves an average yearly performance ratio of 75.4% and a solar fraction (FR) of 0.914, consistently meeting energy demands with an average daily energy production of 1.157 kWh. This study highlights the feasibility of APV systems as a sustainable model for integrated food and energy production in Bangladesh, demonstrating their potential to enhance land-use efficiency and contribute to the nation's energy and agricultural resilience. Description: A Master of Science (M.Sc.) Thesis in the Institute of Energy Technology at Chittagong University of Engineering and Technology (CUET) Thu, 12 Dec 2024 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/597 2024-12-12T00:00:00Z http://103.99.128.19:8080/xmlui/handle/123456789/593 Title: EXPERIMENTAL ANALYSIS OF REFINED WASTE LUBRICATING OILS USING DISTILLATION METHOD TO MINIMIZE ENERGY CONSUMPTION AND ENVIRONMENTAL POLLUTION Authors: ISLAM, MOHAMMED RAFIQUL; ID:, 13MET004P Abstract: The objective of this research project initiative is to stop environmental contamination and reduce energy usage by recycling different kinds of lubricating oils utilized in vehicles and industrial operations in Bangladesh through vacuum distillation. Bangladesh's lubricants oil market size was approximately 201.10 million liters in 2024 and is estimated to reach 292.30 million liters by 2029, growing at a CAGR Of 7.76% from 2024-2029. Bangladesh is completely dependent on imported lubricating Oil. Most Of Bangladesh imports its lubricating oil from various countries including India, Singapore, and the United Arab Emirates. According to Bangladesh's import data, in the 12 months from March 2023 to February 2024, 555 foreign exporters supplied 4,794 shipments of lubricating oil to 461 Bangladeshi buyers, a grmsth rate of compared to the previous twelve months. In February 2024 alone. 334 shipments imported lubricating oil, a growth rate of 48% year-on-year compared to February 2023 and a consecutive growth rate Of 4% per month since January 2024, Growing at a CAGR of 5.4% from 2022 to 2027, the global fuel oil market size is expected to reach USS 96.4 billion by 2027, It is sad and disappointing that Bangladesh has not yet properly managed abandoned waste lubricating Oil. As a result, used waste Oil is being accidentally or intentionally released directly into the environment like rivers, which hurts the environment by endangering drinking water and the lives of aquatic animals. It is estimated that the annual market size of lubricating oil consumption in Bangladesh will be approximately 216.71 million liters in 2025 and increase to 314,89 million liters by 2030, The main objective of this research project is to properly manage and transform abandoned waste lubricating Oil into a wealth resource by purifying it through vacuum distillation. Reduce dependence on imported lubricating Oil and protect the environment by repurposing used lubricating Oil to make it reusable This research project experimentally refines "aste mono-grade motor oil SAE Grade 50, Automotive Gear Oil 90, and Industrial Oil ISO VG 68 for reuse through compound extraction and distillation methods. Distillation technology is used In 85% of "aste oil purification due to its high recovery rate, low cost, energy saving, and environmental friendliness. Lubricating oil acts as a lubricant, corrosion inhibitor, cooling agent, friction reducer, and cleaning agent and removes contaminants from the engine and machinery. In this research study, we collected used lubricating oil from engine workshops named MIS. Best Suppliers and tested it in a standard laboratory German based lubricating oil & grease manufacturer named Lubricants Asia Ltd. (Formally Fuchs Lubricants Bangladesh Ltd.), Chittagong. Different properties analysis Of refined Oil from waste Oil and fresh lubricating Oil, such as cloud and pour point, flash point, specific gravity, ash content, viscosity, moisture ratio and acid value showed the best results, which are almost as good as near about same as fresh The research project's key drawback is the high initial outlay of funds. The financial analysis yields the following results: net present value = BDT 3,425.05 lakh, payback duration = 5 years 6 months, discounted payback period = 6 years 4 months, and IRR = 23%. It was evident from the aforementioned figures that the project is regarded as ecologically friendly, profitable, and financially feasible, Description: A Master of Engineering (M.Engg) Thesis in Institute of Energy Technology (IET) at Chittagong University of Engineering and Technology (CUET). Tue, 15 Jul 2025 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/593 2025-07-15T00:00:00Z http://103.99.128.19:8080/xmlui/handle/123456789/553 Title: Operation Cost Minimization Planning in South Eastern PGCB Grid with Solar PV Energy. Authors: Hossain, Farhana Abstract: Although the demand for power is growing rapidly, it is not being met at the same rate. Even though the generation capacity has reached 20 GW still, significant power crisis is being observed due to unreliable power system operation. Delivering power and energy at a lower cost is inevitable for efficient operation of the electric power system. Increased energy consumption has aggravated the issue of energy security, necessitating the usage of renewable resources. Solar photovoltaic technology is one of the best strategies for encouraging electricity generation from sources of renewable power in Bangladesh. Grid-connected solar photovoltaic systems are becoming more and more popular every day because of the growing amount of solar energy and the declining ancillary prices of solar PV modules. Due to industrialization and fourth industrial revolution electric demand is soaring high. As a result, thereby a gap between demand and supply exist to solve this problem. This research proposes technoeconomic operation of solar PV power integrated power system optimization to optimise operation cost and selling price. A model for solar PV integration has considered with south eastern PGCB grid. We have analysed the techno economic benefit comprises of operational cost and selling price. A grid power system with seven buses is tested using an ideal power flow method. The prospect of injecting renewable power into one of the test bus systems is being investigated. Conventional power plants use seven different kinds of fuel to provide the load. Nine transmission lines connected each of these facilities. To determine the system's optimality conditions, the Lagrangian technique and Karush Kuhn Tucker (KKT) criteria are applied. To evaluate upcoming operational costs and selling prices, a number of prospective case studies have been simulated. Both with and without solar energy, the optimal power source, vi operational costs, and selling price were evaluated. Despite a 60% increase in load, a considerable amount of operating cost was decreased in 2041, accounting for 72.22%. Description: A Master of Science (M.Sc.) Thesis in the Institute of Energy Technology at Chittagong University of Engineering and Technology (CUET). Sun, 19 Jan 2025 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/553 2025-01-19T00:00:00Z http://103.99.128.19:8080/xmlui/handle/123456789/538 Title: DEVELOPMENT OF A MODEL OF ENERGY SAVING ELECTRO HYDRAULIC POWER-STEERING SYSTEM Authors: Barua, Robin; ID, 17MET008P Abstract: Automobile steering system is used to steer a vehicle to the desired path. In mechanical steering system, the driver’s physical effort is used to steer front wheels. But during parking or at slow speeds, steering becomes difficult and energy-consuming because of high friction. Conventional power steering uses hydraulic power to reduce steering effort. The objective of this work is to develop an energy-saving model of electro hydraulic power steering system of vehicle that can save energy and also provide a good steering feel to driver according to vehicle speed and steering rate. Similar systems can be found in Ford, Volkswagen, Audi, and Nissan cars. At first, the model was simulated in Matlab software and then hardware was developed. A set of experiments has been carried out to setup the electro-hydraulic power steering (EHPS) system test bench. The pressure developed in hydraulic chamber is proportional to motor speed. So, the motor speed is controlled via PID controller to regulate the hydraulic pressure according to vehicle speed and steering rate. Fuzzy-logic is applied to tune the proportional (𝐾𝑝) and integral (𝐾𝑖) gain of the PID controller. Experimental results show that the response of the system is fast because of the use of fuzzy logic, which improves the steering feel. An Arduino microcontroller is used to implement the fuzzy-PID algorithm to control the DC motor. The experimental results show that the energy consumption of the proposed model is low compared to conventional hydraulic power steering. Power consumption is calculated for five different torques: 0 Nm, 3.98 Nm, 4.23 Nm, 4.48 Nm, and 5.23 Nm. At high vehicle speeds, the proposed model can save more energy. If set point is greater than current motor speed (set point is 45 and current RPS is 22), then PID saves 0.038505Wh more electrical energy than fuzzy-PID at 0 Nm torque for 10 sec, but it can’t develop the right hydraulic pressure at the right time. If the set point is less than the current motor speed, then fuzzy-PID saves 0.02599 Wh of electrical energy compared to PID at 0 Nm torque for 10 sec, and it can provide sufficient hydraulic power at the right time. For energy saving electrohydraulic power steering system, the correlation of electric power with voltage, current, motor speed, and vehicle speed at 0 Nm torque is 𝑃8 = −181.823 −33.4625v+23.8562i+0*n+0.46321V and the correlation of hydraulic power with hydraulic pressure, pump discharge rate, motor speed, and vehicle speed at 3.98 Nm torque is 𝑃ℎ8 =−4.2179+ 2.3687p+0*q+0*n+0.0241V. Description: An M.Sc. thesis from the Institute of Energy Technology (IET), CUET Tue, 25 Jul 2023 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/538 2023-07-25T00:00:00Z