Teaching-learning self-study approach for optimal retrofitting of dual mixed refrigerant LNG process: Energy and exergy perspective

Qyyum, Muhammad Abdul; Ahmed, Farhana; Nawaz, Alam; He, Tianbiao; Lee, Moonyong

doi:10.1016/j.apenergy.2021.117187

Cited by 27 publications

(4 citation statements)

References 45 publications

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“…Therefore, the direct comparison of results may not lead to a practical conclusion. The goal of Table 8 is to look at various liquefaction processes such as C3MR [51,52], SMR [53,54], and DMR [55] to obtain a broader perspective of the total shaft work being presented for each liquefaction process. The NG pressure in literature varies from 40 bar to 55 bar with methane concentration variation of 82% to 91.4%.…”

Section: Energy Comparison Results With Literaturementioning

confidence: 99%

Thermodynamic, Economic and Environmental Analyses of Ammonia-Based Mixed Refrigerant for Liquefied Natural Gas Pre-Cooling Cycle

Soujoudi

Manteufel

2021

Processes

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Analyzing the entire liquefaction cycle, using a large temperature span with many degrees of freedom, may not always result in a practical solution. The objective of this paper is to investigate the feasibility of using an environmentally friendly refrigerant compound, ammonia, in the mixed refrigerant (MR) for the liquefied natural gas (LNG) pre-cooling cycle through thermodynamic performance, economic analyses and environmental impact. Fifteen cases studies within three major mixed refrigerants groups of MR-1, MR-2 and MR-3 were developed by adding ammonia to various molar compositions of lighter and heavier hydrocarbons. The thermodynamic analysis shows increasing ammonia’s concentrations in the mixed refrigerant by 10% had the largest enhancement on coefficient of performance (COP) of MR-1 by 0.67 and decreased the specific energy consumption of the pre-cooling cycle by 128 kJ/kg compared to the base case. Economic analyses revealed that the mixed refrigerant MR-1, with ammonia, methane, ethane and propane, benefited the most from higher concentration of ammonia in the mixed refrigerant, which resulted in both lower annual capital and operational costs by $2.52 MM and $3.67 MM, respectively. Lastly, reducing the methane concentration in MR and replacing it with ammonia, decreased the amount of refrigerant leakage through compressor’s seals and reduced the global warming potential index (GWPI) of mixed refrigerant up to 24.3%.

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Section: Energy Comparison Results With Literaturementioning

confidence: 99%

Thermodynamic, Economic and Environmental Analyses of Ammonia-Based Mixed Refrigerant for Liquefied Natural Gas Pre-Cooling Cycle

Soujoudi

Manteufel

2021

Processes

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“…LNG emits around 12-20% less CO 2 than traditional maritime fuel oils (Fernández et al, 2017;Balcombe et al, 2021;Jo et al, 2021). However, the required LNG storage infrastructure, operational risk and regulatory uncertainty have prevented the large-scale use of LNG-fueled ships (Qyyum et al, 2021). The commercial viability and market-acceptance significantly motivate the use of LNG-fueled ships due to their economic and environmental merits.…”

Section: Eco-friendly Fuelsmentioning

confidence: 99%

An Overview of Multi-Energy Microgrid in All-Electric Ships

et al. 2022

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Owing to the severe fossil energy shortage and carbon pollution, the extensive electrification of maritime transportation, represented by all-electric ships (AESs), has become an appealing solution to increase the efficiency and environmental friendliness of the industry. To improve energy utilization, not only renewable energy but also thermal energy has been introduced is used in AESs. However, various uncertainties that are associated with renewable energy and ship motions significantly inhibit and complicate the operation and navigation of multi-energy shipboard microgrids. Accordingly, a new coordination of optimal energy management and voyage scheduling is important in reducing both the costs and emissions of AESs. This overview characterizes shipboard microgrids and several emerging technical challenges related to joint power and voyage scheduling, and elucidates prospects for further research, based on a comprehensive survey of the relevant literature.

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“…The learning effect of information-based teaching cannot be purely measured by test scores. The dynamic learning state can be captured in real time by analyzing the learning behaviors and competence improvement in each phase of learning throughout the teaching process [11][12][13][14][15][16][17][18]. To improve the key competences and promote individual development of students, it is important to arrange experiential teaching pertinently, and handle the learning problems timely, referring to the results of itinerary assessment.…”

Section: Introductionmentioning

confidence: 99%

Influence of Experiential Teaching and Itinerary Assessment on the Improvement of Key Competencies of Students

Zheng

2022

Int. J. Emerg. Technol. Learn.

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The thinking and inquiry abilities of students can be improved effectively only through practical exploration and personal experience. To improve the key competences and promote individual development of students, it is important to arrange experiential teaching pertinently, and handle the learning problems timely, referring to the results of itinerary assessment. This paper explores the influence of experiential teaching and itinerary assessment on the improvement of key competencies of students. Firstly, a regression model was established to evaluate the improvement of students’ key competencies, based on stepwise regression. Next, the Iterative Dichotomiser 3 (ID3) model was adopted to classify the tuple of each test sample or research object. Finally, the association rule mining technique was applied to the benchmark evaluation of the improvement of students’ key competencies, and the three benchmark evaluation models were synthetized into an integrated model. The effectiveness of the proposed model was demonstrated through experiments.

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Teaching-learning self-study approach for optimal retrofitting of dual mixed refrigerant LNG process: Energy and exergy perspective

Cited by 27 publications

References 45 publications

Thermodynamic, Economic and Environmental Analyses of Ammonia-Based Mixed Refrigerant for Liquefied Natural Gas Pre-Cooling Cycle

Thermodynamic, Economic and Environmental Analyses of Ammonia-Based Mixed Refrigerant for Liquefied Natural Gas Pre-Cooling Cycle

An Overview of Multi-Energy Microgrid in All-Electric Ships

Influence of Experiential Teaching and Itinerary Assessment on the Improvement of Key Competencies of Students

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