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  4. Performance of air and ground source heat pumps retrofitted to radiator heating systems and measures to reduce space heating temperatures in existing buildings
 
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2022
Journal Article
Titel

Performance of air and ground source heat pumps retrofitted to radiator heating systems and measures to reduce space heating temperatures in existing buildings

Abstract
Heat pumps are expected to play a central role in decarbonizing heat supply, but face challenges in existing buildings due to high temperature requirements of existing radiator systems. This paper links the performance analysis of heat pump systems with methods to reduce temperatures of the space heating circuit. Field data and system simulations of air and ground source heat pumps show a linear correlation between the seasonal performance factor SPF and the mean heat pump temperature over a wide temperature range. Every Kelvin of reduced heat pump temperature increases the SPF by 0.10-0.13 points. Applied methods to reduce heating temperatures are demonstrated at existing multi-family buildings. Thermal insulation reduces the building's heat load, allowing a reduction of heating temperatures with the existing radiators. A further temperature reduction is achieved by analyzing the required heating power per room and identifying critical, undersized radiators. In a stu died building, the selective exchange of only 7% of all radiators is sufficient to reduce heating temperatures from 75°C/60°C -55 °C/45 °C. This corresponds to a reduction of the electricity consumption by 40-42%. However, the potential of these methods is specific for each building and depends particularly on its renovation state and installed radiator capacity. Nonetheless, an energy- and cost-efficient operation of heat pumps retrofitted in existing radiator heating systems is viable, if following the proposed system design method linking heat pump performance and reduction of space heating temperatures.
Author(s)
Lämmle, Manuel
Fraunhofer-Institut für Solare Energiesysteme ISE
Bongs, Constanze
Fraunhofer-Institut für Solare Energiesysteme ISE
Wapler, Jeannette
Fraunhofer-Institut für Solare Energiesysteme ISE
Günther, Danny
Fraunhofer-Institut für Solare Energiesysteme ISE
Hess, Stefan
Univ. Freiburg
Kropp, Michael
Univ. Freiburg
Herkel, Sebastian
Fraunhofer-Institut für Solare Energiesysteme ISE
Zeitschrift
Energy
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DOI
10.1016/j.energy.2021.122952
Language
English
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Fraunhofer-Institut für Solare Energiesysteme ISE
Tags
  • building renovation

  • building simulation

  • heat emission system

  • heat pump efficiency

  • low exergy method

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