Exergy analysis as a tool for the rational use of energy in an average house and everyday personal habits

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2021
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Pereira M.T.R.M.
Mady C.E.K.
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ECOS 2021 - 34th International Conference on Efficency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
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© ECOS 2021 - 34th International Conference on Efficency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems.This article focuses on studying the exergy efficiency of an average household as an appropriate guideline for decision-making concerning technologies and habits in the context of the Brazilian energy matrix and other economic sectors. The exergy behavior is evaluated as a function of the household’s electric appliances and the need for essential services and consumption of everyday items, e.g., food and water. The methods involve evaluating the inputs and outputs to a control volume surrounding the house. As inputs, food, electricity, and fuels were considered, whereas outputs include discharges to the environment in the form of sewage and liquids and urban solid residues. The results show an overall exergy efficiency of 15% for the household, and that the demand for transportation is the most relevant hotspot in both exergy and environmental terms.

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