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Optimal defrost initiation for air-source heat pumps: Evaluating the improvement potential of common defrosting controllers

Author

Listed:
  • Klingebiel, Jonas
  • Höges, Christoph
  • Göbel, Stephan
  • Bannmüller, Paul
  • Boelsen, Thies
  • Venzik, Valerius
  • Vering, Christian
  • Müller, Dirk

Abstract

The timing of defrost initiation for air-source heat pumps (ASHPs) significantly impacts operational efficiency, especially in cold climates. While literature studies demonstrate the existence of optimal defrost initiation time (topt), there is limited knowledge how operational parameters (e.g., air temperature, air relative humidity and heating capacity) influence topt. Additionally, the performance gap between conventional defrosting controllers and the theoretical optimal defrost strategy remains uncertain, leaving the improvement potential for further refinements of defrost controllers unknown.

Suggested Citation

  • Klingebiel, Jonas & Höges, Christoph & Göbel, Stephan & Bannmüller, Paul & Boelsen, Thies & Venzik, Valerius & Vering, Christian & Müller, Dirk, 2025. "Optimal defrost initiation for air-source heat pumps: Evaluating the improvement potential of common defrosting controllers," Energy, Elsevier, vol. 324(C).
    • Handle: RePEc:eee:energy:v:324:y:2025:i:c:s0360544225015130
    DOI: 10.1016/j.energy.2025.135871
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