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نتیجه جستجو - تجزیه و تحلیل چرخه زندگی

تعداد مقالات یافته شده: 2
ردیف عنوان نوع
1 Comparative life cycle analysis of a biodegradable multilayer film and a conventional multilayer film for fresh meat modified atmosphere packaging – and effectively accounting for shelf-life
تجزیه و تحلیل چرخه زندگی مقایسه‌ای یک فیلم چند لایه زیست تخریب‌پذیر و یک فیلم چند لایه معمولی برای بسته‌بندی با اتمسفر اصلاح‌شده گوشت تازه - و به طور موثری برای محاسبه مدت ماندگاری-2021
Life cycle analyses of novel food packaging materials do not often account for the environmental impact of a change in shelf-life, which can result in misleading comparisons. This paper established a methodology for comparative life cycle analyses, whereby the direct effects of the lidding films were compared whilst ensuring the indirect effects of the wasted food portion remained stable. Global warming potential and non-renewable energy use were analysed for a conventional (low-density polyethylene/ethylene vinyl alcohol) versus a biodegradable (polyhydroxyalkanoate/butenediol vinyl alcohol) multilayer lidding film for modified atmosphere packaging of minced beef. Two methodologies were investigated. The first (metric one) changed the barrier layer thickness in the biodegradable film to match the carbon dioxide transmission rate with that of a conventional film. The second (metric two) changed the barrier layer thickness to match a carbon dioxide transmission rate predicted by a mathematical model to ensure the same shelf-life as the conventional film. Using metric two over metric one resulted in 1) a thinner film 2) 2.3 times lower global warming potential. When using sugar beet as the biopolymer feedstock and the current UK disposal system, the biodegradable film had 135% higher global warming potential than the conventional film. By incorporating waste products and better farming practices, the global warming potential of the biodegradable film could be up to 92% lower than that of the conventional film. This work demonstrates how shelf-life can be incorporated into life cycle analyses and the importance of ac- counting for it, in particular when evaluating biodegradables which often have higher permeabilities.
keywords: تجزیه و تحلیل چرخه زندگی | لایه مانع | فیلم لجن | بسته بندی گوشت | عمر مفید | زباله های مواد غذایی | Life cycle analysis | Barrier layer | Lidding film | Meat packaging | Shelf-life | Food waste
مقاله انگلیسی
2 Environmental performance of energy systems of residential buildings: Toward sustainable communities
عملکرد زیست محیطی سیستم های انرژی ساختمان های مسکونی: به سوی جوامع پایدار-2016
The evaluation of the environmental performance of energy systems used in residential buildings by applying the principles of the Life Cycle Analysis is an established methodological approach. Applying it in practice presents, however, significant interest, as a lack of available data has to be overcome. The research results presented in this paper include the analysis of the production, disposal and transportation of the materials used for the manufacturing processes of the building’s energy systems, which include an oil and a gas fired boiler, split unit air conditioners, mono-Si and poly-Si PV arrays, flat plate and evacuated tube solar thermal collectors and their auxiliaries. The data needed for the analysis were taken from audits in the industries producing those systems, from related studies already published and from publicly available databases, when no other source was available. In this way, a comprehensive and fully adjustable database of the systems’ environmental impact has been created. This database can be a part of an integrated dynamic decision support tool, or it can be used in combination with tools commercially available. It can therefore assist prospective users in the selection of the appropriate energy systems that will lead to the minimization of the total environmental impact of new and existing buildings. The results are applied to a representative residential building and its systems are evaluated and analyzed for several scenarios.
Keywords: Environmental performance | Energy systems | Life cycle analysis | Residential buildings | Decision support system
مقاله انگلیسی
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