Both exergy and energy analysis methodologies are used for analysing energy efficiencies in various processes, including agriculture. This study focuses on the connection of three main process components (husbandry-crop-fishpond) in a typical farming household located within an acid soil region of rural Vietnam. The concept of exergy analysis is used to underline the potential for resource efficiency in alternative processes in the agricultural system. For development of an integrated ecological system aiming towards zero emissions, the analytical methods of material cycles and energy flows utilized a set of indicators of resource efficiency in a sustainable agriculture. The design of the ideal integrated farming system “Agro-Industrial Zero Emissions Systems” (AIZES) can increase the system efficiency by making use of indigenous natural materials and waste reuse/recycling. Recycling waste produce energy, fish feed and fertilizer can result in a decreased environmental load of approximately half. Using exergy analysis to calculate an indicator non-renewable yield ratio (NRYR), the systems verified sustainability of agriculture production. The farming household will be able to subsidize their fuel and electricity consumption by utilizing biogas. Surplus biogas will be distributed to proximate households, further creating sustainable goals. Biochar, created by mixing the biomass residues with local plants, will improve soil quality and pig sludge, mixed with biomass residue, will create high-quality fertilizer.

中文翻译：

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越南湄公河三角洲酸性土壤区域内一体化农业生态系统的能源效率

火用和能量分析方法都用于分析包括农业在内的各种过程中的能源效率。这项研究的重点是位于越南农村酸性土壤地区的典型农户中三个主要过程组成部分（畜牧业-鱼塘）的联系。火用分析的概念用于强调农业系统替代过程中资源效率的潜力。为了开发旨在实现零排放的综合生态系统，物质循环和能量流的分析方法利用了一套可持续农业的资源效率指标。理想的综合耕作系统“农业-工业零排放系统”（AIZES）的设计可以通过利用本地天然材料和废物再利用/回收利用来提高系​​统效率。回收废物产生能量，鱼饲料和化肥可导致大约一半的环境负荷减少。该系统使用火用分析来计算指标不可再生产量比（NRYR），验证了农业生产的可持续性。农户将能够利用沼气来补贴其燃料和电力消耗。多余的沼气将分配给附近的家庭，进一步制定可持续的目标。通过将生物质残留物与当地植物混合而产生的生物炭将改善土壤质量，并且将猪粪污泥与生物质残留物混合将产生优质肥料。