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Horizontal Shower Heat Exchanger as an Effective Domestic Hot Water Heating Alternative

Author

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  • Sabina Kordana-Obuch

    (Department of Infrastructure and Water Management, Rzeszow University of Technology, al. Powstańców Warszawy 6, 35-959 Rzeszow, Poland)

  • Mariusz Starzec

    (Department of Infrastructure and Water Management, Rzeszow University of Technology, al. Powstańców Warszawy 6, 35-959 Rzeszow, Poland)

Abstract

Wastewater has significant potential as a source of clean energy. This energy can be used both within external sewer networks and on the scale of individual residential buildings, and the use of shower heat exchangers appears to be the most reasonable solution. However, in the case of Poland, the problem is still the unwillingness of society to use this type of solution, caused mainly by the lack of space for the installation of vertical drain water heat recovery (DWHR) units and the low efficiency of horizontal units. In response to this issue, the efficiency of a new compact shower heat exchanger designed to be mounted below the shower tray, as well as its linear counterpart, was investigated under various operating conditions. In addition, the financial efficiency of using the compact DWHR unit with average water consumption for showering was evaluated. For this purpose, discount methods were used to estimate the financial efficiency of investments. The study showed that the compact shower heat exchanger has higher efficiency than its linear counterpart. Depending on the temperature of cold water and the flow rate of both media through the heat exchanger, it achieves efficiencies ranging from 22.43% to 31.82%, while the efficiency of the linear DWHR unit did not exceed 23.03% in the study. The financial analysis showed that its use is particularly beneficial when the building uses an electric hot water heater. The investment’s sensitivity to changes in the independent variables is small in this case, even with low water consumption per shower. The only exceptions are investment outlays. Therefore, the compact DWHR unit is a clean energy device, which in many cases is financially viable.

Suggested Citation

  • Sabina Kordana-Obuch & Mariusz Starzec, 2022. "Horizontal Shower Heat Exchanger as an Effective Domestic Hot Water Heating Alternative," Energies, MDPI, vol. 15(13), pages 1-22, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:13:p:4829-:d:853654
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    References listed on IDEAS

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    1. Beata Piotrowska & Daniel Słyś, 2023. "Analysis of the Life Cycle Cost of a Heat Recovery System from Greywater Using a Vertical “Tube-in-Tube” Heat Exchanger: Case Study of Poland," Resources, MDPI, vol. 12(9), pages 1-17, August.
    2. Orest Voznyak & Nadiia Spodyniuk & Ievgen Antypov & Edyta Dudkiewicz & Mariana Kasynets & Olena Savchenko & Svitlana Tarasenko, 2023. "Efficiency Improvement of Eco-Friendly Solar Heat Supply System as a Building Coating," Sustainability, MDPI, vol. 15(3), pages 1-18, February.
    3. Sabina Kordana-Obuch & Mariusz Starzec, 2023. "Experimental Development of the Horizontal Drain Water Heat Recovery Unit," Energies, MDPI, vol. 16(12), pages 1-24, June.
    4. Przemysław Ogarek & Michał Wojtoń & Daniel Słyś, 2023. "Hydrogen as a Renewable Energy Carrier in a Hybrid Configuration of Distributed Energy Systems: Bibliometric Mapping of Current Knowledge and Strategies," Energies, MDPI, vol. 16(14), pages 1-18, July.
    5. Sabina Kordana-Obuch & Mariusz Starzec & Michał Wojtoń & Daniel Słyś, 2023. "Greywater as a Future Sustainable Energy and Water Source: Bibliometric Mapping of Current Knowledge and Strategies," Energies, MDPI, vol. 16(2), pages 1-34, January.
    6. Beata Piotrowska & Daniel Słyś, 2022. "Comprehensive Analysis of the State of Technology in the Field of Waste Heat Recovery from Grey Water," Energies, MDPI, vol. 16(1), pages 1-20, December.
    7. Sabina Kordana-Obuch & Michał Wojtoń & Mariusz Starzec & Beata Piotrowska, 2023. "Opportunities and Challenges for Research on Heat Recovery from Wastewater: Bibliometric and Strategic Analyses," Energies, MDPI, vol. 16(17), pages 1-36, September.

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