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

Tailu Li (), Xuelong Li, Haiyang Gao, Xiang Gao and Nan Meng
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Tailu Li: Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, 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

Energies, 2022, vol. 15, issue 19, 1-24

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.

Keywords: geothermal energy; organic Rankine cycle; vapor compression cycle; combined heating and power; energy cascade utilization; feasibility analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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