Browsing by Author "Naser, Abu"

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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.
Improvement of Elastic Property of Circular Weft Knit Three-Thread Fleece Fabric by Changing Stitch Length
(AATCC Journal of Research , Ingenta Connect, 2021-01-01) Hossain, Md. Shakhawat; Alimuzzaman, Shah; Haque, Md Ahsanul; Naser, Abu
The market demand for three-thread fleece fabric is increasing steadily due to its soft and bulky texture. Garments made from knitted fleece fabric, such as sweaters and jackets, are generally used for outdoor wear, especially in the winter season because of their warmth, moisture, and absorption properties. However, the elastic properties of three-thread fleece fabric is reduced significantly after the raising operation. This study aimed to increase the elastic recovery of three-thread fabric by changing the stitch length during the manufacturing process in industrial-scale production. The results showed that by varying the stitch length, the elastic recovery was improved by around 9%. Hence, the developed method can be used in textile knitting industries to improve the elastic recovery of fleece fabric.
Kinetics and Thermodynamics of Silk Dyeing with Turmeric Extract
(AATCC, 2018-05-01) Naser, Abu; Haque, Md. Ahsanul; Farzana, Nawshin; Smriti, Shamima akter; Islam, M.A.
A kinetics and thermodynamics study of turmeric extract dyeing on Bombyx mori silk fabric was conducted with 1 g/L initialdye concentration at three temperatures (70 °C, 85 °C, and 100 °C). The fabric was pre-mordanted with FeSO4 and dyed with the turmeric extract at pH 7 and a material liquor ratio (MLR) of 1:20. Pseudo first-order and pseudo second-order kinetics were tested. The adsorption kinetics of turmeric extract dyeing on silk fit the pseudo second-order kinetic model. The activation energy was 94.9 kJ/mol. The enthalpy and entropy of activation were 91.93 kJ/mol and –14.47 J/mol∙K, respectively. © 2018, American Association of Textile Chemists and Colorists. All rights reserved.
Prediction of whiteness index of cotton using bleaching process variables by fuzzy inference system
(2018-02-28) Naser, Abu; Haque, Md. Ahsanul; Smriti, Shamima Akter; Hussain, Manwar; Farzana, Nawshin; Siddiqa, Fahmida; Islam, Md. Azharul
A fuzzy prediction model has been built based on hydrogen peroxide concentration, temperature and time of bleaching as the input variables and knitted fabric whiteness index as the output variable. The process parameters affecting the whiteness index of cotton knitted fabrics are very non-linear. Fuzzy inference system is a prospective modeling tool as it can map effectively in nonlinear domain with minimum investigational data. Triangular-shaped membership functions were considered for the variables and total 48 rules were created in this study. It was found that the sole effect of the concentration of hydrogen peroxide on whiteness is pretty low, but is affected by temperature noticeably even in a fixed concentration of hydrogen peroxide. The model proposed in the present study has been verified by additional experimental data set. The root mean square, mean absolute error percentage and coefficient of determination (R 2 ) between the predicted and experimental values were found to be 0.536, 0.798 and 0.959 respectively. The results validate that the model can be applied suitably for the prediction of fabric whiteness index in textile industries.