An exergy based approach to resource accounting for factories

Khattak, Sanober Hassan; Greenough, Richard; Korolija, Ivan; Brown, Neil

doi:10.1016/j.jclepro.2015.12.029

Cited by 14 publications

(15 citation statements)

References 21 publications

(16 reference statements)

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“…According to Rosen [25], unfamiliarity of the exergy concept in the industry, and viewing the analysis method as too cumbersome and complicated are among the main reasons that impede its application in practice. The results of a survey on this topic revealed similar results [26]. There are also limitations in the exergy concept with regards to the selection of the reference environment [27].…”

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confidence: 61%

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Towards Improved Energy and Resource Management in Manufacturing

2018

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Exergy analysis has widely been used to assess resource consumption, and to identify opportunities for improvement within manufacturing. The main advantages of this method are its ability to account for energy quality and consumption. However, its application in industrial practice is limited, which may be due to the lack of its consistent application in practice. Current energy management standard, that facilitate consistent application of procedures do not consider the quality aspects of energy flows. An exergy based energy management standards is proposed in this paper that would take into account energy quality aspects, while facilitating the consistent application of exergy analysis in industrial practice. Building on ISO50001, this paper presents guidelines for implementing energy and resource management in factories, incorporating the concepts of exergy and holistic factory simulation, as illustrated through a manufacturing case study. From the factory level analysis, a chilling process was identified to have significant improvement potential. A dry fan cooler, using ambient air was proposed for the improved efficiency of the chillers. Energy based metrics portrayed a system that operated at high efficiency, however exergy analysis indicated much room for further improvement, therefore impacting decision making for technology selection. The contribution of this paper is in presenting a set of prescriptive guidelines that could possibly be further developed into a new energy management standard that would utilize the advantages of exergy analysis towards improved energy and resource management in manufacturing.

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confidence: 61%

“…Additionally, energy flows are not completely defined by their quantity alone, as their quality is equally important Khattak et al [20]. Therefore, the application of exergy analysis may therefore lead to clearer information about resource consumption improvement options in the factory environment.…”

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confidence: 99%

Towards Improved Energy and Resource Management in Manufacturing

2018

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“…This article presents an exergy-based approach for the modelling of water flows in a factory. It can be considered part of a broader exergy-based methodology for resource accounting in manufacturing [54]. Moreover, exergy-based economic methods (exergoeconomics) could possibly be used to extend the scope of the methodology described in this article [55].…”

Section: Discussionmentioning

confidence: 99%

Resource accounting in factories and the energy-water nexus

Khattak

Greenough

2017

Int J Adv Manuf Technol

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A manufacturing system comprises production processes and building services, both of which are supplied by different energy carriers as well as raw materials and water. These resources interact according to complex relationships and are converted into products for sale and waste flows. Holistic resource accounting allows the analyst to consider the dynamic relationships between these components, including the strong interdependence between energy and water, which has been called the energy-water nexus. Exergy analysis is a method that accounts for mass and both the quantity and quality of energy, while allowing analysis on a common basis, and for this reason, it is used increasingly to analyse resource consumption in manufacturing systems; however, it has rarely been used to consider water flows alongside energy and material flows. The main contribution of this paper is the presentation of modelling water flows in terms of exergy in the context of sustainable manufacturing. Using this technique in combination with previously developed exergy-based methods, the result is a truly holistic resource accounting method for factories based on exergy analysis that incorporates water flows. The method is illustrated using a case study of a food factory in which a 4.1% reduction in resource use is shown to be possible by employing anaerobic digester in an effluent water treatment process. The benefits of this technology option would have been underestimated compared to the benefits of waste heat capture if an analysis based on mass and energy balances alone had been used. The scientific value of this paper is the demonstration of the relatively high exergy content of effluent flows, which should therefore be regarded as potentially valuable resources. The analytical method presented is therefore of value to a wide range of industries beyond the food industry.

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“…and biogas manure can be applied to water and farmland as fertilizer. 16,[25][26][27] If the biogas manure is over the environmental capacity, the excessive emissions are defined as RL (1d) .…”

Section: Sustainable Development Conditions Of Scale-breedingmentioning

confidence: 99%

Sustainable development of livestock and poultry scale‐breeding based on integration control of resource losses and external environmental costs

2020

Env Prog and Sustain Energy

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Intensive livestock and poultry breeding can supply meat products and increase farmers' income. However, it may cause high resource losses (RL) and environmental deterioration if its wastes are not handled correctly. Therefore, sustainable development of scale-breeding industry is very important. In this article, the sustainable development mechanism of livestock and poultry scale breeding was analyzed from the perspective of joint control of RL and external environmental costs (EEC). Further, the estimated models of EEC and RL were built and the sustainable development conditions were discussed. Correspondingly, the internal driving force and external constraining force for the scale-breeding sustainable development were analyzed empirically. The results show that based on the empirical analysis the production activities of all sample farms result in EEC and RL. All sample farms are in profitable state with traditional profit analysis method. If resource consumption and environment effects are considered, the actual profits of most farms decreased greatly. After some measures are taken to control EEC and RL, the number of farms under deficit decreased and the profit of many farms increase by more than 20%. The number of farms in the sustainable development conditions rises by 30%. The joint control of RL and EEC is an effective way to facilitate the sustainability of scale-breeding industry.

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An exergy based approach to resource accounting for factories

Cited by 14 publications

References 21 publications

Towards Improved Energy and Resource Management in Manufacturing

Towards Improved Energy and Resource Management in Manufacturing

Resource accounting in factories and the energy-water nexus

Sustainable development of livestock and poultry scale‐breeding based on integration control of resource losses and external environmental costs

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