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Comparison of the charging/discharging performance for various storage tanks
Abhishek Awasthi,Jae Dong Chung 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
A numerical analysis was conducted to examine the effect of internal heat exchanger structure on the charging/discharging performance of LTES. Case studies were conducted by varying some universal parameters like 1) Flow Rate per unit Volume of PCM (FR/ V<SUB>PCM</SUB>), 2) Heat Transfer Coefficient × Tube Heat Transfer Area per unit V<SUB>PCM</SUB> (hA/ V<SUB>PCM</SUB>) and 3) Tube length per unit velocity of HTF (L/v). The results show positive impact of flow rate and heat transfer coefficient on the performance of LTES, in addition to this the large tube length shows negative impact on the LTES performance.
Heat transfer by enhanced sinusoidal surface area of PCM capsule
Abhishek Awasthi,Binit Kumar,Jae Dong Chung 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
A numerical analysis was conducted to examine the effect of capsule shape on phase change material (PCM) melting speed. Case studies were conducted: (1) with variable amplitude, (2) with variable number of sinusoids, and (3) with the same irregular cylindrical capsule perimeter but different amplitude and number of sinusoids. Unlike observations with a convection-only inside capsule, the amplitude of irregularity in capsule shape a , rather than capsule area, was found to be the dominant factor in heat transfer enhancement. The opposing influences of amplitude a and number of sinusoidal undulations n on the intensity of natural convection was observed.
Effect of sinusoidal cylindrical surface of PCM on melting performance
Abhishek Awasthi,Binit Kumar,Huy Hai Nguyen,이승수,JAE DONG CHUNG 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.8
A numerical analysis was conducted to examine the effect of capsule shape on phase change material (PCM) melting speed. The surface parameters of the irregular capsule shape were amplitude a and the number of sinusoidal undulations n . Case studies were conducted: (1) with the same number of sinusoids but variable amplitude, (2) with the same amplitude but variable number of sinusoids, and (3) same PCM volume, i.e., the same irregular cylindrical capsule perimeter. Unlike observations with a convection-only inside capsule, the amplitude of irregularity in capsule shape a , rather than capsule area, was found to be the dominant factor in heat transfer enhancement. The capsule area was important only during the initial conduction-dominant period. The opposing influences of amplitude a and number of sinusoidal undulations n on the intensity of natural convection was observed. The result shows that only increasing the area does not increase the melting performance, it is the amplitude a which enhance the melting performance.
Role of Informal Sector in Sustainable Resource Recycling from E-waste
( Abhishek Kumar Awasthi ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
The skyrocketing demand, new technologies, and high need lead to in unbelievable consumption of electronic and electrical equipments (EEEs). Though, these scientific growths and development reduced the overall life time of EEE, in that way generating bulks of e-waste. The e-waste management is becoming one of the big and serious challenge tackled in the twenty-first century owing to the escalating figure rise globally and mainly treated by informal sector, especially in developing countries, and leads to their potential cause of hazardous source of contamination and valuable materials loss. And due negative impact, these complex metallic and non-metallic fractions triggering severe negative impact causing within the natural ecosystem, risking the living species; if not dealt with appropriately. Hence, there is a demanding for quick action on the best e-waste management strategies for developing and developed countries. On the one side, the separation and recovery of the valuable and precious fractions from the e-waste may be an identical dimensional strategy of economic point of view, and while at the same time plunging the disturbing threats to natural ecology. Though, these risks are somehow better addressed by the developed countries to atleast some extent through the strict law enforcement, and appropriate recycling facilities. However, the many of the developing countries lacks the relevant focus law, gaps in policy and strategy making, socio-economic-environmental barriers, technology advances and limitations, and the proper handling facilities. This article identified some major gaps abstaining the best e-waste management approach, particularly in the developing. For example, the integration of the informal and formal sectors, authorised network registry, strict enforcements of relevant law, manufacturers obligation with improved eco-designs, regulated transboundary movements, better consumer awareness, and, investing on best recycling facilities as well as advance disposal services are very important. Additionally, substituting the conventional and traditional procedures with the innovative and eco-friendly scientific methods for example integrated processes using hybrid technologies and micro factories will significantly fixing the current barriers of the e-waste management. In conclusion, this article will be a thorough glancing for the forthcoming research on management of e-waste of small to larger scales. Therefore, in this article, the management of e-waste is evaluated having the developing countries recycling system as an example. This article presents systematic illustration of a simplified self-help group (SHG) park. The SHG park could use Apple’s Daisy robot, or similar technical assistance, and financial infrastructure as an eco-friendly model for supplementing a circular economy on e-waste management in developing countries. The motivation for creating SHGs approach, depicted in the box under robotic technology, include benefits to labour, public health, environmental protection, economic productivity and boosts for sustainable development. In order to scale up to support e-waste management at the national level in developing countries these SHG parks need support either through the micro-financial systems of the banks offering initial financial provisions, or through corporate social responsibility funding by involving experienced institutions/organizations to promote the SHG formation - and this must be implemented under the umbrella of the environmental regulatory authority of the country. Closing the current gaps in the circular economy framework for electronic waste will also require continuous monitoring and assessment to support the shift from waste disposal to recycling and resource recovery.