Annual performance analysis of solar-assisted raw-water source heat pumps at low water temperatures

Changho Han, Jinyoung Kim, Wonhee Cho, Hyun Ho Shin, Hoseong Lee, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


With the increase in energy consumption for building heating and cooling, raw-water source heat pumps (RWSHPs) have garnered strong attention because of their advantages of high efficiency and utilization of a clean heat source. However, RWSHPs exhibit poor performance at low water source temperatures. Thus, this study proposes a solar-assisted raw-water source heat pump (SA-RWSHP) to solve the performance degradation of RWSHPs. The SA-RWSHP can improve performance during the heating period by elevating the entering water temperature (EWT) using solar collectors. During the cooling period, a solar heat source can be used to produce domestic hot water. Optimal design parameters are determined by analyzing the performance of SA-RWSHP using the TRNSYS. Additionally, the performance of SA-RWSHP is compared with that of RWSHP. During the heating period, the unit COP (COPhp) of SA-RWSHP was 12.7% higher than that of RWSHP on average, owing to the increase in the EWT. Furthermore, the annual total system COP of SA-RWSHP was approximately 18% higher than that of RWSHP owing to the high COPhp and effective use of solar energy. Overall, the SA-RWSHP exhibited superior performance throughout the year, resulting in a substantial reduction in building energy consumption.

Original languageEnglish
Article number130386
Publication statusPublished - 2024 Mar 15

Bibliographical note

Publisher Copyright:
© 2024 Elsevier Ltd


  • Economic analysis
  • Energy savings
  • Raw-water source heat pump
  • Renewable energy
  • Solar-assisted raw-water source heat pump

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Modelling and Simulation
  • Renewable Energy, Sustainability and the Environment
  • Building and Construction
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Pollution
  • Mechanical Engineering
  • General Energy
  • Management, Monitoring, Policy and Law
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Annual performance analysis of solar-assisted raw-water source heat pumps at low water temperatures'. Together they form a unique fingerprint.

Cite this