Browsing by Author "Kolakoti, Aditya"

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Study on The Behavior of Light on Erosion in Epoxy Coating on SS316L
(Indian Maritime University, Kolkata Campus, 2025) Das, Nattath Sreejith; Das, Nachiketa; Kolakoti, Aditya
This research employs optical analysis, and light intensity analysis with, three coating systems—pure epoxy, epoxy with 0.1 wt.% graphene, and epoxy with 1 wt.% graphene—were systematically evaluated for their erosion resistance and optical characteristics on SS316L stainless steel substrates. The coating thicknesses ranged from 85 µm to 103 µm, with erosion factor calculated as the reduction from the maximum thickness (103 µm). Pure epoxy exhibited the highest erosion factor of 18 µm, followed by 11 µm for epoxy + 0.1% graphene, and as low as 5 µm for epoxy + 1% graphene, indicating improved erosion resistance with increasing graphene content. Surface roughness (Ra) measurements showed a corresponding rise due to erosion, increasing from approximately 0.33 µm to 1.12 µm for pure epoxy, whereas the increase was limited from 0.19 µm to 0.45 µm in epoxy + 1% graphene coatings, highlighting the protective advantage of graphene modification. Optical analysis using RGB light filters further revealed a progressive increase in deviation values with erosion severity, where pure epoxy exhibited a maximum deviation of 0.165 at highest erosion, compared to only 0.025 for epoxy + 0.1% graphene and 0.008 for epoxy + 1% graphene at lower erosion levels. Additionally, the Energy Index (Ep), sensitive to nanoscale surface roughness, demonstrated a strong inverse correlation with Ra (Pearson Linear Correlation Coefficient, PLCC = 0.91; Mean Absolute Error, MAE = 10.7 nm), while the Structural Color Aliasing Index (SCY) effectively captured macro-level degradation, showing higher correlation (PLCC = 0.93) and a MAE of 0.12 µm. These findings not only confirm the erosion mitigation capability of graphene-reinforced coatings but also establish a robust foundation for non-destructive, real time optical monitoring of coating health using structured light and digital image-based metrics.
Towards decarbonization goals: a pathway to a sustainable future /
(Universitas Muhammadiyah Magelang, 2024-12-22) Kolakoti, Aditya
Nature operates on a delicate balance of give and take. However, in the name of development, human activities have disrupted this balance by polluting ecosystems and releasing excessive greenhouse gases into the atmosphere. As a result, global temperatures are reaching unprecedented levels, leading to abrupt climatic changes that pose a significant threat to humanity. Immediate and collective action is essential to ensure the survival of future generations. The adoption of Decarbonization goals offers a promising pathway to mitigate greenhouse gas emissions and reduce the pollution burden on Earth, aiming for substantial progress by 2030.
Vapor compression refrigeration system with air and water cooled condenser: analysis of thermodynamic behavior and energy efficiency ratio /
(Universitas Negeri Padang, 2024-12-14) Kolakoti, Aditya
This study presents the analysis of thermodynamic behavior and energy efficiency of a vapor compression refrigeration system with two types of condensers: air-cooled (ACC) and water-cooled (WCC). The main objective is to assess the system performance by comparing the Coefficient of Performance (COP) and Energy Efficiency Ratio (EER) under both condenser configurations. During a 12-hour test period, data on refrigerant pressure, temperature, and electrical energy consumption were collected and analyzed. The results show that the WCC system outperforms the ACC system, showing a 5.7% increase in heat rejection and a 4.2% increase in cooling capacity. In addition, the WCC system exhibits a lower compressor duty cycle and consumes less electrical energy, resulting in a higher total EER of 5.658 compared to ACC of 1.945. These findings suggest that integrating a water-cooled condenser into a refrigeration system can significantly improve energy efficiency and reduce operating costs, making it a viable option for commercial applications in tropical regions.