IET Thesis

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    Phase Behavior Analysis of a Gas Condensate Reservoir
    (CUET, 7-May-2024) Mahjabin, Nadia
    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.
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    Performance Assessment of Electric Vehicle Charging in a Charging Station Considering Charging Time and Price
    (University of Agder, Norway, 28-Aug-2024) ULLAH, MOHAMMAD FAHAD
    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
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    INDUSTRIAL SAFETY AND ENERGY MANAGEMENT RELATED TO LPG BOTTLING PLANTS
    (CUET, 17-Jul-2023) Islam, Mohammed Ainul
    Liquefied Petroleum Gas (LPG) is regarded as a safe and cost-effective alternative to natural pipelined gas. It is a flammable gaseous hydrocarbon compound formed mostly of propane (C3H8), butane (C4H10), and isobutene (C4H8), or even a combination of these, and liquefied at ambient temperature and moderate pressures, produced as a byproduct of crude oil or natural gas processing. It has a high heating value and reduces emissions by 75% (CO), 10% (CO2), 40% (NO2), 85% (ozone-depleting gases), and 85%(unburned hydrocarbons). There are many LPG bottling plants in Bangladesh. LPG leakage occurs while unscrewing screws or filling a cylinder from the carousel or in the pipeline. LPG accidents occurred generally from flash fire, VCE, pool fire, fire ball, BLEVE, Leak, etc. In such circumstances, worker safety is essential, and energy security is required for energy consumption. The main objective of this study was to investigate the hazards of LPG and its effect on bottling plant worker’s safety and the environment due to leakages of LPG.
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    Enhancing the Micro-Grid reliability in industrial distribution feeders by generating bus splitting model
    (CUET, 31-Mar-2024) Naser, Abu
    This thesis aims to explore the stability and control of an Industrial Micro-Grid (IMG) system engaged to provide uninterrupted and high-quality power to around 165 export-oriented industries in Chattogram Export Processing Zone (CEPZ) and 70 similar industries in Karnaphuli Export Processing Zone (KEPZ) located in Chattogram, Bangladesh. The Industrial Micro-Grid model consists of 5 (five) natural gas (NG) fired IC Engine based Generating Sets (GS), each having a capacity of 8.73 MW and 3 (three) others of 9.34 MW individual capacity along with a span of around 80 running KM mixed mode (O/H & U/G) 11 KV distribution network with 3 (three) 33 KV regional national grid connectivity all together. These generators could be operated in either island or grid mode to supply independently power to 15 industrial distribution 11KV feeders of CEPZ and 08 identical feeders of KEPZ having capacity ranging from 2.5 to 5.2 MW of load in each. This entire IMG is mostly dependable on a dedicated 72 MW IC engine based natural gas fired power plant to meet its most of the energy demands. The uninterrupted and reliable power supply is crucial for the operation of export-oriented industries within CEPZ and KEPZ, which collectively demand a maximum of 100 MW of which 72 MW is made available from its internal power generating source and additional 28 MW is sourced from the regional national grid of electricity. Despite the constant demand for uninterrupted power, frequent tripping of this IMG due to various faults mainly originating from consumer ends has posed a significant challenge for its trusted reliability. To mitigate this issue within a tolerable limit, a tactful unique solution called "Generating Bus Splitting (GBS),” was conceived which involves the proposal of disintegrating & relocating of one master feeder from its Central Generation Bus (CGB) to rationally distribute fault burden concentration. This modification also offers several advantages, including grid shifting loss reduction, improved grid dispatch, reduced total blackout risks of the entire IMG, and enhanced emergency power interruption handling capabilities.
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    DEVELOPMENT OF AN INNOVATIVE MICROWAVE SOLAR DRYER FOR SEAFOODS
    (CUET, 11-Jul-2023) TALUKDER, SAGAR
    Drying is an ancient fish preservation method, involving a combination of heat and mass transfer to extend the life of fish materials. It is, however, an energy-intensive process that consumes approximately 20 to 25% of the energy used by the food processing sector. Developing innovative drying systems such as Microwave Solar Drying (MSD) and utilizing renewable energy such as solar energy in drying can be a potential solution for reducing conventional energy consumption in the drying process. An innovative solar energy-focused MS dryer system is developed and implemented in this Thesis. Microwave solar dryer optimization is necessary to create an efficient system that can influence drying conditions (e.g., relative humidity, flow rate, air temperature, MW power) to reach better efficiency and better-quality dried fish. An air duct is designed and connected to this microwave setup to accurately measure the velocity of additional controlled air (0.1 m/s, 0.11 m/s, and 0.12 m/s) supplied to the microwave from outside. The solar-assisted microwave dryer is carried out at different air velocities (0.1 m/s, 0.11 m/s, and 0.12 m/s) of 200 watts and 400 watts. This thesis also determines and compares the drying time and quality of some dried Bombay duck, silver belly, and silver Jewfish from both (MSD) and (TSD). Three marine fish samples obtained from sun and microwave drying were tested for Proximate composition and bacterial loads at the department of marine fisher’s lab and poultry research lab training centre at Chittagong Veterinary and Animal Sciences University. All the fish samples were analyzed moisture, protein, crude fiber, crude fat, ash, calcium, and phosphorus according to AOAC (AOAC, 2016) methods. Microwave solar dryer (200-watt, 400 watt) drying yielded the best food content of Bombay duck, silver belly, Silver Jew fish compared to natural sun drying. Bacteriological study was conducted according to FDA BAM method. The bacterial loads of the solar-assisted microwave drying and traditional sun drying in Bombay duck, silver belly, and Silver Jewfish were 5.89×106cfu/g, 8.9×105cfu/g, & 4.96×105cfu/g (MSD) and 8.6×107cfu/g 5.6×108cfu/g, & 8.0×106cfu/g (TSD) respectively. In comparison to convective natural air drying, microwave solar drying produced fish with better product quality while using significantly less power. According to the study's findings, Microwave solar drying at 50°C with a pulse ratio of 3.0 reduced considerably drying time when compared to convective natural air drying, and it should be the preferred approach for drying to
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    DESIGN AND DEVELOPMENT OF ENERGY EFFICIENT TEMPERATURE CONTROL OF AN EGG INCUBATOR SYSTEM
    (CUET, 13-Aug-2023) Rahman, Md.Mizanur
    To meet the high demand for poultry production, artificial egg hatching is needed. An
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    A Comprehensive Approach to Battery Management System Incorporating Dynamic Power Limiting with Thermal Management Algorithm
    (University of Agder, Norway, 28-Aug-2024) Haque, Afsanul
    This study critically presents the model of a Battery Management System (BMS) for monitoring and controlling battery parameters in various applications. The presented model allows for comprehensive monitoring and analysis of critical battery metrics such as State of Charge (SOC), charging, discharging, and voltage. By developing and testing the model prior to hardware implementation, significant advantages including time and cost savings, as well as error identification, are realized. The BMS serves as a crucial component in these applications, ensuring efficient battery utilization, optimizing performance, and enhancing system safety.