Evaluation of carbon dioxide equivalent values for greenhouse gases: CEWN as a new indicator replacing GWP

Sekiya, Akira; Okamoto, Sayuri

doi:10.1016/j.jfluchem.2009.11.020

Cited by 15 publications

(3 citation statements)

References 4 publications

(11 reference statements)

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“…Although the comprehensive research of human activity intensity has made some progress, researchers have not yet formed such comprehensive index algorithms as Ecological Footprint (Rees, 2001;Wackernagel and Rees, 1997) and Global Warming Potential (Sekiya and Okamoto, 2010) which have strong universality and are widely used. This paper tries to learn from Ecological Footprint and Global Warming Potential on their academic ideas and research framework.…”

Section: Introductionmentioning

confidence: 99%

Human activity intensity of land surface: Concept, methods and application in China

2016

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Abstract:Human activity intensity is a synthesis index for describing the effects and influences of human activities on land surface. This paper presents the concept of human activity intensity of land surface and construction land equivalent, builds an algorithm model for human activity intensity, and establishes a method for converting different land use/cover types into construction land equivalent as well. An application in China based on the land use data from 1984 to 2008 is also included. The results show that China's human activity intensity rose slowly before 2000, while rapidly after 2000. It experienced an increase from 7.63% in 1984 to 8.54% in 2008. It could be generally divided into five levels: Very High, High, Medium, Low, and Very Low, according to the human activity intensity at county level in 2008, which is rated by above 27%, 16%-27%, 10%-16%, 6%-10%, and below 6%. China's human activity intensity was spatially split into eastern and western parts by the line of Helan Mountains-Longmen Mountains-Jinghong. The eastern part was characterized by the levels of Very High, High, and Medium, and the levels of Low and Very Low were zonally distributed in the mountainous and hilly areas. In contrast, the western part was featured by the Low and Very Low levels, and the levels of Medium and High were scattered in Gansu Hexi Corridor, the east of Qinghai, and the northern and southern slopes of Tianshan Mountains in Xinjiang.

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Section: Introductionmentioning

confidence: 99%

Human activity intensity of land surface: Concept, methods and application in China

2016

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“…As previously mentioned, these LCAs will focus on the greenhouse gas emissions of each sleeper. There are several different greenhouse gases (GHGs) produced over a sleeper's life cycle and these each have different impacts on global warming [20]. To accommodate this variability, emissions will be reported as CO 2 e (or CO 2 equivalent).…”

Section: Life Cycle Assessmentmentioning

confidence: 99%

Life Cycle Cost and Assessment of Alternative Railway Sleeper Materials

et al. 2022

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Improvements in plastic recycling technology along with pressure to reduce emissions and waste has led to a desire to find environmentally friendly, cost competitive railway sleepers. This study conducts life cycle analyses of emissions and costs for timber, concrete, short fibre and long fibre composite railway sleepers to determine which sleepers are more environmentally friendly and cost competitive. The results clearly highlight the environmental advantages of short fibre plastic composites. The basic scenario had concrete sleepers being the most cost competitive, before factoring in the recyclability and likely future cost reductions of short fibre composite sleepers. With as little as 50% of the entirely recyclable short fibre sleepers being recycled their cost quickly becomes comparable to concrete sleepers. Further, there are several likely changes in the future that will make short fibre sleepers even more cost competitive. The short fibre industry is still growing and could substantially reduce costs through the effects of economies of scale and experience curves of production. A further driver of future cost competitiveness would be the broader use of an Australian or international carbon price, where concrete sleepers have a disadvantage. Together, these changes indicate that short fibre composites have great potential financially and environmentally.

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“…These harmful phenomena come from more absorption of infrared light due to the green house gases such as carbon dioxide, methane, nitrous oxide, chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrochlorofluorocarbons (HFCs), perfluorocarbons (PFCs), etc [3][4][5]. Among these chemicals, CFCs that had a lot of uses with refrigerators and air conditioners, have been already replaced by HFCs.…”

Section: Introductionmentioning

confidence: 99%

Enthalpy Changes of Adsorption of Tetrafluorocarbon (CF₄) and Hexafluoroethane (C₂F₆) on Activated Carbon

Shin¹,

Suh²,

Choi

2014

Clean Technology

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주제어 : 흡착엔탈피변화, 사불화탄소, 육불화에탄, PFC Abstract : Under low pressures of CF4 and C2F6 up to 20.7 kPa, the equilibrium adsorbed quantity on activated carbon was experimentally examined using the volumetric method at various temperatures between 293.15 K and 333.15 K. To give the best fit to the experimental data curve, the two step model (i.e., Langmuir model for the first layer adsorption and then Freundlich physisorption) is suggested. The method of initial slope yielded the enthalpy of adsorption for the first step while we could apply the Clausius-Clapeyron equation to find the heat of adsorption of the second step. They are 25.9 kJ/mol and 11.8 kJ/mol, respectively, with CF4, and 38.7 and 38.2 kJ/mol with C2F6.

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Evaluation of carbon dioxide equivalent values for greenhouse gases: CEWN as a new indicator replacing GWP

Cited by 15 publications

References 4 publications

Human activity intensity of land surface: Concept, methods and application in China

Human activity intensity of land surface: Concept, methods and application in China

Life Cycle Cost and Assessment of Alternative Railway Sleeper Materials

Enthalpy Changes of Adsorption of Tetrafluorocarbon (CF₄) and Hexafluoroethane (C₂F₆) on Activated Carbon

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Evaluation of carbon dioxide equivalent values for greenhouse gases: CEWN as a new indicator replacing GWP

Cited by 15 publications

References 4 publications

Human activity intensity of land surface: Concept, methods and application in China

Human activity intensity of land surface: Concept, methods and application in China

Life Cycle Cost and Assessment of Alternative Railway Sleeper Materials

Enthalpy Changes of Adsorption of Tetrafluorocarbon (CF4) and Hexafluoroethane (C2F6) on Activated Carbon

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Product

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Enthalpy Changes of Adsorption of Tetrafluorocarbon (CF₄) and Hexafluoroethane (C₂F₆) on Activated Carbon