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Small demonstrator of a thermoelectric heat-pump booster for an ultra-low-temperature district-heating substation

Author

Listed:
  • Tomc, Urban
  • Nosan, Simon
  • Vidrih, Boris
  • Bogić, Simon
  • Navickaite, Kristina
  • Vozel, Katja
  • Bobič, Miha
  • Kitanovski, Andrej

Abstract

Heating and cooling systems account for approximately 50% of global energy consumption and contribute 40% of carbon dioxide emissions. District-heating systems offer enhanced energy efficiency, diversification, independence from energy sources, and the utilization of waste and renewable energy sources. One key energy-efficiency measure in district heating is reducing the supply and return temperatures. Fourth-generation district-heating systems operate with supply temperatures of 50 to 60 °C, enabling better utilization of renewable and waste heat. Fifth-generation district-heating systems further lower the supply/return temperatures, requiring additional heat sources, such as boosters, to heat domestic hot water. Heat pumps, specifically vapour-compression heat pumps, are the most energy-efficient devices for converting fuels or electricity into heat for space and water heating. However, vapour-compression technology faces challenges related to environmentally friendly refrigerants, noise, vibration, compactness, and energy efficiency, especially for small units. In this study, we introduce a novel design of thermoelectric-based heat-pump booster. Despite its lower exergy efficiency, this technology offers advantages such as compactness, silent operation without vibration, easy power control, and longevity. We demonstrate that these thermoelectric heat-pump boosters can increase the supply-water temperature of district-heating systems from around 32 °C to 42 °C, with a heating coefficient of performance equal to 2.4 and an exergy efficiency of 9.9%.

Suggested Citation

  • Tomc, Urban & Nosan, Simon & Vidrih, Boris & Bogić, Simon & Navickaite, Kristina & Vozel, Katja & Bobič, Miha & Kitanovski, Andrej, 2024. "Small demonstrator of a thermoelectric heat-pump booster for an ultra-low-temperature district-heating substation," Applied Energy, Elsevier, vol. 361(C).
    • Handle: RePEc:eee:appene:v:361:y:2024:i:c:s0306261924002824
    DOI: 10.1016/j.apenergy.2024.122899
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    References listed on IDEAS

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