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Sustainability-driven techno-economic assessment of a seawater source heat pump system with heat recovery for mariculture

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  • Wang, Luhang
  • Wang, Long
  • Wang, Chunli
  • Xu, Chunwen
  • Yin, Yijin
  • Su, Huan

Abstract

This study explores seawater source heat pump (SWSHP) systems with heat recovery for sustainable mariculture energy solutions. A TRNSYS-integrated thermal balance model accurately simulated dynamic thermal loads in solar aquaculture greenhouses. SWSHP demonstrated high in-field energy efficiency with average COP and COPs of 4.67 and 4.23, peaking at 5.27 and 4.60, respectively. Among four evaluated heating schemes, Scheme 3 (wastewater preheating cultivation seawater) reduced heating demand by 8.89 %, while Scheme 2 (preheating makeup seawater to SWHP) showed the highest performance metrics (COP: 4.69, SCOP: 4.61). SWSHP-based schemes demonstrated over 80 % primary energy savings compared to traditional coal-fired systems. Economically, Scheme 3 reduced running costs by 4.95 %, increased NPV by 14.96 %, and lowered lifecycle cost by 3.88 % compared to Scheme 2. Environmentally, it reduced carbon emissions by 3.01 %. Low heating costs in China were attributed to cheaper aquaculture heat pumps, government subsidies, heat recovery devices, and lower agricultural electricity rates, demonstrating the significant potential of SWSHP technology with optimized heat recovery strategies for sustainable aquaculture heating.

Suggested Citation

  • Wang, Luhang & Wang, Long & Wang, Chunli & Xu, Chunwen & Yin, Yijin & Su, Huan, 2025. "Sustainability-driven techno-economic assessment of a seawater source heat pump system with heat recovery for mariculture," Renewable Energy, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:renene:v:252:y:2025:i:c:s0960148125011322
    DOI: 10.1016/j.renene.2025.123470
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