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Energy Recovery from Wastewater: A Study on Heating and Cooling of a Multipurpose Building with Sewage-Reclaimed Heat Energy

Author

Listed:
  • Daniele Cecconet

    (Department of Civil Engineering and Architecture, University of Pavia, 27100 Pavia, Italy)

  • Jakub Raček

    (AdMaS Research Centre, Faculty of Civil Engineering, Brno University of Technology, 61200 Brno, Czech Republic)

  • Arianna Callegari

    (Department of Civil Engineering and Architecture, University of Pavia, 27100 Pavia, Italy)

  • Petr Hlavínek

    (AdMaS Research Centre, Faculty of Civil Engineering, Brno University of Technology, 61200 Brno, Czech Republic)

Abstract

To achieve technically-feasible and socially-desirable sustainable management of urban areas, new paradigms have been developed to enhance the sustainability of water and its resources in modern cities. Wastewater is no longer seen as a wasted resource, but rather, as a mining ground from which to obtain valuable chemicals and energy; for example, heat energy, which is often neglected, can be recovered from wastewater for different purposes. In this work, we analyze the design and application of energy recovery from wastewater for heating and cooling a building in Brno (Czech Republic) by means of heat exchangers and pumps. The temperature and the flow rate of the wastewater flowing in a sewer located in the proximity of the building were monitored for a one-year period, and the energy requirement for the building was calculated as 957 MWh per year. Two options were evaluated: heating and cooling using a conventional system (connected to the local grid), and heat recovery from wastewater using heat exchangers and coupled heat pumps. The analysis of the scenarios suggested that the solution based on heat recovery from wastewater was more feasible, showing a 59% decrease in energy consumption compared to the conventional solution (respectively, 259,151 kWh and 620,475 kWh per year). The impact of heat recovery from wastewater on the kinetics of the wastewater resource recovery facility was evaluated, showing a negligible impact in both summer (increase of 0.045 °C) and winter conditions (decrease of 0.056 °C).

Suggested Citation

  • Daniele Cecconet & Jakub Raček & Arianna Callegari & Petr Hlavínek, 2019. "Energy Recovery from Wastewater: A Study on Heating and Cooling of a Multipurpose Building with Sewage-Reclaimed Heat Energy," Sustainability, MDPI, vol. 12(1), pages 1-11, December.
    • Handle: RePEc:gam:jsusta:v:12:y:2019:i:1:p:116-:d:300846
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    References listed on IDEAS

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