Abstract:

[Objectives] Recently, the organic Rankine cycle - vapor compression cycle (ORC-VCC) system has made great progress in the fields of low-grade heat energy utilization and cold and heat supply with its advantages of compact structure, low carbon and energy saving. The latest advances in the ORC-VCC are reviewed, focusing on three key aspects of configuration, working fluid selection, and application direction. [Methods] Firstly, five different configurations were outlined, and their principles and characteristics were elucidated to demonstrate the structural versatility and working condition adaptability of ORC-VCC. Subsequently, the development history of working fluids was summarized, and the principles of working fluid selection were summarized in terms of thermophysical properties, environmental protection, and economics. The economic evaluation results of the system in different studies were concluded, and the importance of economic analysis was pointed out. In addition, the potential application areas of the system were summarized from both supply and demand sides, and application cases of integration with other systems were presented, with a view to highlight the extensive research and application potential of ORC-VCC. Finally, the shortcomings of the current research were pointed out and the future research directions were prospected. [Conclusions] The ORC-VCC system has broad development prospects and huge development potential. Its application in the energy field will make important contributions to achieving the goals of low-carbon, energy-saving and sustainable development.

Key words:

"> organic Rankine cycle-vapor compression cycle, configuration optimization, working fluid screening, integrated application, renewable energy, multi-energy complementary, distributed energy, heat pump