http://103.99.128.19:8080/xmlui/handle/123456789/462 Mon, 24 Aug 2026 10:51:18 GMT 2026-08-24T10:51:18Z http://103.99.128.19:8080/xmlui/handle/123456789/530 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). Sun, 13 Jul 2025 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/530 2025-07-13T00:00:00Z http://103.99.128.19:8080/xmlui/handle/123456789/529 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) Wed, 12 Jul 2023 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/529 2023-07-12T00:00:00Z http://103.99.128.19:8080/xmlui/handle/123456789/522 Title: Phase Behavior Analysis of a Gas Condensate Reservoir Authors: Mahjabin, Nadia Abstract: Retrograde condensation is the term used to describe certain unusual features that result from condensate production in gas reservoirs. Unlike traditional gas reservoirs, this kind of reservoir experiences phase behaviour changes that affect the flow characteristics. This study's primary goal is to examine the nature of a specific gas condensate reservoir and create a model to track changes in fluid flow under specified circumstances. In this case, the Kailashtila gas field of Bangladesh has been taken into consideration. Both laboratory tests and simulations are performed to analyse the fluid composition, phase behaviour. Results are then summarized using simulation software (PVTSIM) to develop the phase diagram and other property curves of the fluid. The simulated and lab results implicate the reservoir to be a lean gas reservoir which is retrograde in nature. In the second part, a mathematical model is developed to represent the changes in flow pattern due to condensate banking near well-bore region. The condensate banking surrounding the wellbore has a significant impact on the deliverability of gas wells producing below the dew-point pressure. The pressure transient test analysis is further complicated by condensate banking because of the multiphase flow and mixture composition shift. Analytical approach has been employed to find a solution of the model and then the sensitivity analysis of the model has been performed by incorporating real field test data. According to the model, the reservoir is the total of three flow zones. The three flow areas are as follows: outer region 3 contains just gas; middle region 2 contains both gas and condensate but only gas is mobile; and inner region 1, which contains both gas and condensate flowing simultaneously. The pressure squared approach has been selected to determine the flow rate considering real field production and pressure transient test data under specified condition. The response obtained from the analysis matches with the trend of typical flow curve but showed deviation in the calculated and observed results.The condensate utilized as a feedstock in oil refineries is the subject of the study's third section. To produce assay data both laboratory tests and computer-aided analysis has been performed. The goal of this work is to develop a method to a comprehensive and organized characterization of gas condensate as a refining feedstock. The study also focuses on a critical examination of the assay data from samples of gas condensate that were taken from Kailashtila (KTL) gas fields. The study initially carried out laboratory tests to establish the boiling point. Empirical correlations are used to determine the necessary physical parameters for calculations involving the refining process. Utilizing Peng Robinson's thermodynamic model, a simulation software (DWSIM) helps in creating pseudo-components and their associated attributes using the generated true boiling point data. Thus, the study investigated the fluid's overall phase behaviour in both subsurface and surface conditions. The study's findings showed that by adjusting the number of trays or equilibrium stages in the distillation column, one can modify the amount and quality of product obtained as well as lower the energy consumption of a specific distillation process. Although condensates are usually defined through compositional analysis, this study took a slightly different approach than it would with crude oil. Oil refineries that are thinking about using condensate as an alternate of crude oil, may find the study helpful in constructing and simulating the refining process, assessing feedstocks, and determining economic worth. Description: An M.Sc. Thesis from the Institute of Energy Technology. Tue, 07 May 2024 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/522 2024-05-07T00:00:00Z http://103.99.128.19:8080/xmlui/handle/123456789/513 Title: Performance Assessment of Electric Vehicle Charging in a Charging Station Considering Charging Time and Price Authors: ULLAH, MOHAMMAD FAHAD Abstract: Climate change is a buzz word in recent times. The whole world is suffering from it, temperature rise, sea level increase and many more are the consequences of it. One of the main reasons of it is the exploitation of fossil fuel. By burning fossil fuel, it emits different types of detrimental gases like 𝐶𝑂2,𝐶𝐻4 etc in combination these are called Green House Gas (GHG). But 17% of this GHG & 20% of 𝐶𝑂2 is produced from transportation sector. To mitigate this the whole world is emphasizing at electrification of the transportation sector. And EV can be a proper solution for it. But there are some obstacles regarding to its purchase and its convenience. As the price of the electric vehicle is still high than fuel-based vehicle, time consumption of an electric vehicle for charging is numerous, inadequate amount of charging station infrastructure and another important issue is range anxiety of the EV drivers. As of now there are 16.5 million EV’s are operating in the world and the IEA estimates that 300 million EVs will be in use by 2030, in accordance with the scenario of net zero emissions by 2050.To ensure uninterrupted service to this huge fleet of EV a lot of planning and implementation is needed. In this paper we proposed time-based price and charging-rate varying plan regarding for EVCS. which consider the effect on grid with the addition of huge EV fleet and EVCS financial profit. And we compared it with the conventional Charging system where charging price is volatile but charging time is fixed and constant charging system where both price and charging time are constant. We prepared a probabilistic conditional statement based optimizing algorithm for three of the system. And we considered 24hr scenario for all the systems. Results indicate that nothing controls consumer choices in the constant method, whereas only pricing may do so in the conventional way. This can result in a sudden increase in load at the charging station. However, with our approach, price, charging rate, and a combination of both helped spread out customers throughout various time periods while keeping the system in balance. Additionally, both traditional and constant systems have experienced consumer losses, which resulted in a financial loss for the charging station Description: A Master of Engineering Thesis from the Institute of Energy Technology. Wed, 28 Aug 2024 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/513 2024-08-28T00:00:00Z