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

Author

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

Abstract

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.

Suggested Citation

  • Han, Changho & Kim, Jinyoung & Cho, Wonhee & Shin, Hyun Ho & Lee, Hoseong & Kim, Yongchan, 2024. "Annual performance analysis of solar-assisted raw-water source heat pumps at low water temperatures," Energy, Elsevier, vol. 291(C).
    • Handle: RePEc:eee:energy:v:291:y:2024:i:c:s0360544224001579
    DOI: 10.1016/j.energy.2024.130386
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