Directly combining a power cycle and refrigeration cycle: Method and case study

Dongpeng Zhao, Changho Han, Wonhee Cho, Li Zhao, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Developing renewable energy and improving the efficiency of energy systems can effectively reduce carbon dioxide (CO2) emissions. The combined cycle has attracted attention owing to its high efficiency and variety of products. Although some combined cycles have been proposed in the existing literature, studies focusing on the directly combing method of closed power and refrigeration cycles are rare. This study summarizes the general principles of directly combining power and refrigeration cycles by sharing a thermodynamic process. Four different types of combined cycles were proposed using the Carnot and reversed Carnot cycles. Other combined cycles can evolve from these four combined cycles by considering different practical factors. In addition, an improved combined cycle involving sharing part of the condensation and compression processes between a CO2 power cycle and a vapor compression cycle was proposed. An energy analysis of the improved combined cycle was conducted. There are two operating modes of the improved combined cycle depending on the network output. Within the conditions studied, the maximum coefficient of performance of the improved combined cycle was approximately 0.306 and 0.676 in the cooling and power mode and the cooling mode, respectively.

Original languageEnglish
Article number125017
Publication statusPublished - 2022 Nov 15


  • Combined power and cooling cycle
  • Heat pump
  • Refrigeration
  • Transcritical CO power cycle
  • Vapor compression cycle

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Modelling and Simulation
  • Renewable Energy, Sustainability and the Environment
  • Building and Construction
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Pollution
  • Mechanical Engineering
  • Energy(all)
  • Management, Monitoring, Policy and Law
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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