Chittagong University of Engineering & Technology

About: Chittagong University of Engineering & Technology is a education organization based out in Chittagong, Bangladesh. It is known for research contribution in the topics: Computer science & Renewable energy. The organization has 1200 authors who have published 1444 publications receiving 10418 citations. The organization is also known as: Engineering College, Chittagong & Bangladesh Institute of Technology, Chittagong.

Spatial distribution of heatwave vulnerability in a coastal city of Bangladesh

Abstract: While extreme heat events received wider attention in recent years, understanding heatwave vulnerability is still a challenging task that requires a clear understanding of a range of location-dependent climatic, socio-economic, physiological, and environmental parameters. This study investigates the spatial distribution of heatwave vulnerability in Chattogram City Corporation (CCC) — the commercial capital of Bangladesh. A heatwave vulnerability index (HVI) was developed, including various parameters related to three latent variables — exposure, sensitivity, and adaptive capacity — derived using remote sensing and socio-economic data. Factor analysis was performed to assess all parameters related to HVI. Besides, spatial autocorrelation, cluster and outlier analyses, and hot spot analysis were carried out to investigate the spatial distribution of HVI. This study shows a spatial distribution of HVI in CCC, which is spatially associated with various individual parameters. A total of seven wards (smallest administrative zone of CCC) were found to be very highly vulnerable to the heatwave. This study further reveals that heatwave vulnerability is randomly distributed throughout the city, although the high land surface temperature is concentrated in the existing built-up areas. It also identified three major hot spots of heatwave vulnerability in CCC. The methodology and findings of this study will be of interest to the policymakers and city planners to prepare mitigation plans, policies, and strategies to mitigate this hazard.

Design and exploration of functioning of a D-Z shaped SNG multiband metamaterial for L-, S-, and X-bands applications

Abstract: A design and performance analysis of a new triple-band metamaterial (MTM) is imparted in this article. The proposed MTM is able to produce three operating frequency bands and can be applicable for L-, S-, and X-bands applications. The L-band and S-band frequency responses are caused by electric resonance, and the X-band is generated by magnetic resonance. The triple-band response is produced by combining two open D-shaped loops coupled with a Z-shaped metal strip. To conclude the electromagnetic behaviour of the proposed MTM, the Nicolson Rose Weir method is utilized, and effective parameter extraction from reflection and transmission coefficient is done. Then the parametric analysis is done by changing the arm length of the loop, varying the capacitive gaps of the structure to analyse the performance of the proposed structure. Moreover, the equivalent circuit analysis of three individual frequency bands is performed for a clear understanding of the resonance phenomena of the proposed MTM. Besides, the analysis of 1×2, 2×1, 2×2, and 4×4 array structures of the unit cells is done to validate the activities of the MTM because array structure is often needed to improve the performance of an antenna. All the structures reveal their triple-band operation and promising for L-, S-, and X-bands applications. The proposed MTM unit cell exhibits a larger effective medium ratio (17.7) for the lower frequency band. So, the projected compact MTM is a promising solution for different microwave applications.

Synthesis of biodiesel from chicken skin waste: an economic and environmental biofuel feedstock in Bangladesh.

Abstract: One of the dominating meat supply industries, the poultry chicken sector, is facing waste management concerns worldwide. Due to high oil content containment, biofuel researchers emphasized poultry waste as abundant, cheap, and high-quality feedstock for biodiesel production. Therefore, in the current study, an experimental investigation of biodiesel production from wasted chicken skin through the transesterification process has been performed. The chicken skin used in this study for biodiesel production can be used as the potential waste source for biodiesel production worldwide. Techno-economic, environmental, and sustainability analyses were also performed. During the synthesis, the reaction was conducted with potassium hydroxide (KOH), and the process yielded 48% biodiesel. The cost of electricity for providing electricity is estimated at US$0.575 per kWh when an auto-sized generator has been fueled by biodiesel. The environmental and substantiality analysis found that biodiesel is more suitable than conventional diesel as an environmentally friendly and sustainable fuel.

Optimal Energy Mix and Operation Cost in the Presence of Nuclear and Solar PV Generation

Abstract: This paper presents the electrical energy condition in Bangladesh. By analyzing the tentative energy demand by the year of 2025 the aspect of energy crisis is discussed. Several ongoing Government projects and their contribution to meet future demand, along with current renewable energy scenario are acknowledged. The prospects of feasible renewable energy resources are considered. To fulfill the electrical energy demand until the year 2025, energy mix has been proposed. Three comparative scenarios have been considered for the year 2018, 2021 and 2025. The west zone power stations and sub-stations are considered to carry out the load at different buses at a minimum cost. Linear programmed optimum power flow method has been used to evaluate the generating capacity as well as the selling price of each generating stations for both off-peak and on-peak hour of generation. The emission of CO 2 is calculated by considering the emission of each fuel type used in different generating stations.

Input switched single phase high performance bridgeless AC-DC Zeta converter

Abstract: A new input-switched single-phase high performance bridgeless AC-DC Zeta converter (Inverse SEPIC) topology is proposed. Instead of using a single phase rectifier followed by a boost DC-DC converter, or using a bridge rectifier with two diodes and two switches, the converter's input is chopped at high frequency during positive and negative cycles by a single bidirectional switch to get step-up/step-down AC-DC conversion. Total Harmonic Distortion (THD) of the input current of the proposed circuit with small input current filter is low. Input power factor and the efficiency of conversion of the circuit are high. The circuit exhibits such performance with variable loads at constant frequency switching. No additional control is required to achieve the advantages.