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Thermodynamic Performance of Geothermal Energy Cascade Utilization for Combined Heating and Power Based on Organic Rankine Cycle and Vapor Compression Cycle

Author

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  • Tailu Li

    (Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Xuelong Li

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Haiyang Gao

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Xiang Gao

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Nan Meng

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

Abstract

A large population and rapid urbanization dramatically promote the heating supply demand, the combined heating and power (CHP) system for energy cascade utilization came into being. However, the research on the recovery and utilization of condensing heat, the exploration of the coupling law between power generation and heating supply, and the influence of heat source parameters on thermo-economic performance are still insufficient. To this end, two combined heating and power (CHP) systems coupled with an organic Rankine cycle (ORC) and vapor compression cycle (VCC) are proposed, and their thermodynamic and economic performances are optimized and analyzed by the laws of thermodynamics. Results show that the increase of the volume flow will increase the power generation and heating supply quantity of the system, and there is an optimal evaporation temperature range of 130–140 °C to optimize the performance of the system. The increase of heat source temperature will improve the economic performance of the system, but it will reduce the exergetic efficiency. Therefore, two factors should be comprehensively considered in practical engineering. There is mutual exclusivity between the net power output of the system and the heating supply quantity, it should be reasonably allocated according to the actual needs of users in engineering applications. In addition, the exergetic efficiency of the two systems can reach more than 60%, and the energy utilization rate is high, which indicates that the cascade utilization mode is reasonable.

Suggested Citation

  • Tailu Li & Xuelong Li & Haiyang Gao & Xiang Gao & Nan Meng, 2022. "Thermodynamic Performance of Geothermal Energy Cascade Utilization for Combined Heating and Power Based on Organic Rankine Cycle and Vapor Compression Cycle," Energies, MDPI, vol. 15(19), pages 1-24, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:19:p:7294-:d:933201
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    1. Alla Ali Ibrahim & Muhammet Kayfeci & Aleksandar G. Georgiev & Gülşah Karaca Dolgun & Ali Keçebaş, 2022. "Performance Assessment of a Novel Solar and Biomass-Based Multi-Generation System Equipped with Nanofluid-Based Compound Parabolic Collectors," Energies, MDPI, vol. 15(23), pages 1-23, November.

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