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Performance analysis and control strategies of a gas-electric hybrid high-temperature hot water supply system for industrial applications.

Author(s) : ZHENG Y., FAN J., JIANG P., WEN Q., WU J., GUAN X., LIU Y., CAO J., QIAO L., LIU W., TENG W.

Type of article: IJR article

Summary

Decarbonizing industrial heating processes remains a critical challenge in the global energy transition. While high-temperature heat pumps (HTHPs) offer a promising pathway, their widespread application is hindered by substantial performance degradation at low ambient temperatures and the requirement for costly power capacity expansion. To address these limitations, this study proposes a novel gas-electric hybrid system that deeply integrates an air-source high-temperature heat pump with a gas boiler (GB). The system can operate in multiple modes, including ADHP-only, ADHP-GB hybrid, air-source single-stage heat pump with gas boiler (ASHP-GB), and GB-only modes. A steady-state thermodynamic and economic simulation is conducted to evaluate system performance under varying ambient temperatures and gas-to-electricity price ratios. Results show that at an ambient temperature of -15◦C and a supply temperature of 90◦C, the ADHP–GB mode achieves a system coefficient of performance of 2.38, representing an approximately 40% improvement compared with the ADHP mode. Exergy analysis indicates that the hybrid mode increases exergy efficiency by 76–81% compared with the GB mode, while maintaining acceptable thermodynamic performance relative to the ADHP mode. Economic analysis demonstrates strong competitiveness: at a gas-to-electricity price ratio of 4 and an ambient temperature of 7◦C, the system achieves a payback period of 3.9 years and a net present value (NPV) of 0.2 million yuan. When the price ratio increases to 7, the payback period is reduced to <1 year and the NPV rises to 1.8 million yuan. The results indicate that the proposed system provides a flexible and economically viable solution for industrial high-temperature heating in regions with cold climates and variable energy price structures.

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Details

  • Original title: Performance analysis and control strategies of a gas-electric hybrid high-temperature hot water supply system for industrial applications.
  • Record ID : 30034910
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 186
  • Publication date: 2026/06
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2026.106900

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