RESEARCH

PUBLISHED

A.N.M Nihaj Uddin Shan, Md. Zayed Mostafa, Arman Hossain, Mohmmad. Shadman Sakib, M. Monjurul Ehsan, Thermal assessment and optimization of process fluids in transcritical organic and transcritical CO2 Rankine cycle for waste energy recuperating system, Energy Conversion and Management: X, Volume 15, 2022, 100258, ISSN 2590-1745, https://doi.org/10.1016/j.ecmx.2022.100258. (https://www.sciencedirect.com/science/article/pii/S2590174522000812)

Abstract: As natural resources are depleting gradually, scientists are inclining toward the quest for an alternate source of energy and searching for efficient ways to mitigate wastage of energy. The potential of the organic Rankine cycle (ORC) in the application of recovering energy from medium and low-temperature heat sources has been explored by researchers for a long time. Over the years numerous optimizations and modifications have appeared to extract usable power from sources that are fundamentally discharging waste energy to the environment. In this study, a thermodynamic model of basic transcritical Organic Rankine Cycle (TORC) and carbon dioxide-based transcritical Rankine cycle are modeled using a validated MATLAB code, scrutinizing the optimum condition of eleven working fluids. This study prioritizes environment-friendly working fluids and the fluids with lower ODP and GWP indices have been selected for experimentation. These working fluids have been tested setting optimized input parameters and a comparative study of working fluids has been done using exergy destruction distribution. According to the second law analysis, at low turbine inlet temperature, R32 works better than other process fluids. Whereas, at higher temperatures, carbon dioxide delivers better performance compared to other working fluids.

Keywords: Transcritical; Organic; Working fluid; Waste heat recovery; Thermodynamic analysis; CO2

COMPLETED (TO BE PUBLISHED)

Rice Husk Ash Concrete: Study with Experimental and Theoretical result of Compressive Strength and Other Characteristics

This research presents a study on the development of cement's physical properties by using rice husk ash (RHA) as a supplementary material instead of cement. The study was directed after a specific curing period of 7 days on models with two different replacement percentage of RHA, 5% and 10%. The experimental results of these models were compared with the model containing 0% rice husk ash. In the Universal Testing Machine, the experiment was induced to find compressive strength, Young's modulus and failure point. A simulation using Ansys Structural analysis was also done to validate the result.

Waste to Energy: Potential of using activated carbon and rice husk ash mixture in primary cells.

This study was focused on producing green energy. In this study, we used organic waste and recycled aluminum foil to generate electricity. Activated carbon and rice husk ash mixture were used to make an Aluminum-air cell. A part of this study was to analyze the potential of using this mixture inside a Zn-C dry cell as cathode. Findings from both cases were very prominent.

ACADEMIC PROJECTS

Designing and Analysis of a Shell and Tube Type Heat Exchanger for Practical Application

The objective was to find a practical design of a heat exchanger to cool down the air using water as cooling fluid. A counterflow type heat exchanger was designed, and calculations were done using MATLAB. A 3D Computer Aided design was also added along with ANSYS Simulation using Fluent Solver. MATLAB result was verified using ANSYS Fluent.

Graphical representation of temperature in different points

Design and Thermal Analysis of a 130MVa Regenerative Reheat Rankine Cycle Power Plant

Component set up for the powerplant

T-S Diagram of the Thermodynamic Cycle

The objective of this project was to design a 130MVa thermal powerplant. The chosen cycle was Regenerative Reheat Rankine Cycle. It was analyzed both from 1st law and 2nd law perspectives and the system components were simulated using MATLAB.

Numerical Analysis of Waste Heat Recovery Using CO2 Based Trans-Critical Organic Rankine Cycle

This project was focused on showing the performance of a Trans-critical Organic Rankin Cycle (TORC). First, a MATLAB program was developed and then the result was validated by comparing results with other publications. In this project, COOLPROP and MATLAB were used.

Designing and Finite Element Analysis of a Drill Jig for Practical Use

This project was a part of the course "Tool Engineering." This study aimed to design a drill jig whose purpose is to perform drilling operations without shifting the job regularly. The analysis work is carried out on clamp plates to determine the stress, strain, and deformation using ANSYS. According to the dimension, all parts were designed and assembled by using SolidWorks to test its performance.

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