http://103.99.128.19:8080/xmlui/handle/123456789/462 2026-09-13T20:56:14Z 2026-09-13T20:56:14Z Hossain, Farhana http://103.99.128.19:8080/xmlui/handle/123456789/553 2026-09-06T04:04:32Z 2025-01-19T00:00:00Z

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).

2025-01-19T00:00:00Z Barua, Robin ID, 17MET008P http://103.99.128.19:8080/xmlui/handle/123456789/538 2026-09-06T03:51:19Z 2023-07-25T00:00:00Z

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

2023-07-25T00:00:00Z Tibriz, Samshut ID:, 19MET007F http://103.99.128.19:8080/xmlui/handle/123456789/530 2026-08-20T11:08:20Z 2025-07-13T00:00:00Z

Title: Feasibility and sensitivity of an Electrical power system utilizing to ensure sustainable development at offshore area of Bangladesh. Authors: Tibriz, Samshut; ID:, 19MET007F Abstract: This article delves into the potential of various renewable energy technologies on NijhumDwip a tranquil island in the Bay of Bengal. It explores the practicality and sensitivity assessment of establishing an electrical power system powered by renewable energy aiming to support sustainable development and implement charging stations for fishing boats in NijhumDwip, Bangladesh. The research emphasizes the use of renewable energy sources such as solar, wind, and biogas power to fulfill the energy needs of this isolated island while minimizing environmental repercussions. A thorough sensitivity analysis assesses the impact of critical variables, including resource availability, system costs and policy frameworks on the effectiveness and sustainability of the system. The results suggest that integrating renewable energy systems in NijhumDwip can provide dependable and sustainable electricity for local communities and maritime operations. Establishing renewable-powered charging stations for fishing boats presents an opportunity to lessen fuel reliance, cut down on carbon emissions and encourage eco-friendly fishing methods. This study presents valuable recommendations for policymakers and energy planners to create sustainable energy solutions specifically designed for the distinct challenges of NijhumDwip, aligning with Bangladesh's aspirations for green energy and sustainable development. Given the island's isolation, there is a notable lack of transmission infrastructure and modern facilities, making it an ideal candidate for renewable energy sources like solar, wind and biogas energy—potentially reducing its carbon footprint to near zero. Using HOMER software, various configurations of hybrid renewable energy systems were optimized based on system sizes, combinations of renewable energy sources, and other critical parameters. The total Net Present Cost (NPC) for this hybrid energy system was calculated at $5,149,628.00, with an impressive Cost of Energy (COE) of $0.216, which is quite reasonable considering the system's clean nature, ultimately protecting the island's biodiversity. Description: A Master of Engineering (M.Engg) Thesis in the Institute of Energy Technology at Chittagong University of Engineering and Technology (CUET).

2025-07-13T00:00:00Z Tarafder, Anup ID, 18MET001F http://103.99.128.19:8080/xmlui/handle/123456789/529 2026-08-18T11:09:23Z 2023-07-12T00:00:00Z

Title: STUDY OF THE FOOD CROP DRYING PROCESS BY USING PHASE CHANGE MATERIAL(PCM) SOLAR COLLECTOR MASTER OF SCIENCE IN ENERGY TECHNOLOGY Authors: Tarafder, Anup; ID, 18MET001F Abstract: Solar dryers are a sustainable and cost-effective alternative to traditional drying methods for various food items. The basic components of a solar dryer include a solar collector, a hot air circulation system, and a drying chamber. The solar collector absorbs and converts solar radiation into thermal energy, which is used to heat the air that circulates through the drying chamber. Three types of solar collectors have been used in this research experimental solar crop dryer. They are Copper plate, Aluminum plate and Galvanized iron sheet coated with black paint for maximizing solar heat absorption. The size of three plates are 1m2 and thickness is 1mm. Three types of food crops potato, normal paddy and boil paddy (each 500gm) were dried in solar dryer and in open sun at the same time. The product dries faster in solar dryer when Copper plate uses as a solar collector. This happens due to the thermal conductivity of copper plates is higher than aluminum and galvanized iron sheet. Open sun drying took 1.5 hours longer to dry than using the experimental solar dryer. The air circulation system helps to distribute the heated air evenly around the food material, promoting efficient drying. The solar dryer was operated at four air velocity 1.8m/s, 2.2m/s, 2.5m/s and 2.7 m/s. Crops dry faster at 2.5 m/s velocity because they can absorb better moisture. At 2.5 m/s air velocity in the experimental solar dryer dry potato, normal paddy and boil paddy (each 500gm) take drying time of 1.5 hours,1.5 hours and 1 hour which is shorter drying time than open sun drying. Paraffin waxes are used as a phase change material(PCM) (100gm/m2,200gm/m2, 300gm/m2 and 400 gm/m2) in this research experiment. When 300 gm/m2 phase change material (PCM) is used as a heat storage medium then it took the least drying time than other amounts of phase change material (PCM). Experimental solar dryer using 300gm/m2 PCM as heat storage in copper plate collector, potato, normal paddy and boil paddy (each 500 gm) take drying time 2 hours ,2 hours and 1.5 hours respectively which is shorter drying time than open sun drying. The maximum collector efficiency of copper plate solar collector and with PCM were found 21% and 25% respectively which is higher than aluminum plate solar collector (18%) and with PCM (21%) respectively. The highest drying efficiency with copper plate solar collector and with PCM were determined to be 8.5% and 14.4%, respectively, which is greater than aluminum plate solar collector (7%) and with PCM (12.9%) respectively. The co-relation among the drying chamber temperature, absorber plate temperature, and solar intensity is (Fdct) = 36.49229+0.012944tAPT -0.05424 Si and the co-relation v among drying time, amount of PCM, air velocity and drying chamber temperature(0C) is (Fdt)=7.9375-0.008125WPCM+2.51Av+0.3125Tdtem. Proximate analysis (Moisture, Protein, Crude Fiber (CF), Crude Fat (EF), Ash) is done to check the quality of the product. The value of proximate analysis was found to be better in dryer than open sun. Pearson’s Correlation coefficient was found within the range (0.76-0.98) for all cases. PCM-based solar dryers use materials that can store and release large amounts of thermal heat energy during the phase change, providing a stable and consistent drying temperature and humidity even in variable weather conditions. Additionally, PCM can be used to store excess thermal heat energy generated during peak sunlight hours, which can be released later to maintain the drying temperature during periods of low sunlight. Description: An M.Sc. thesis from the Institute of Energy Technology (IET)

2023-07-12T00:00:00Z