Performance analysis of a new transcritical R744 refrigeration cycle with expander-mechanical overheating

Sun, Dahan; Teng, Fei; Liu, Zekuan; Xu, Jing; Qin, Jiang

doi:10.1016/j.applthermaleng.2022.119285

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…(4) With the increase of intermediate pressure, the cooling capacity of the system gradually decreases, and the power consumption of the compressor first decreases and then increases, so that the COP of the system first increases and then decreases, that is, there is an optimal intermediate pressure to make the COP of the system maximum. In addition, with the increase of evaporation pressure, the optimal intermediate pressure under different evaporation pressures increases [10].…”

Section: Fundingmentioning

confidence: 97%

Performance Analysis of a Carbon Dioxide Transcritical Two-Stage Compression Refrigeration System

Wei,

Wang,

Xie

et al. 2023

Advances in Transdisciplinary Engineering

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In this paper, based on the energy analysis method is established across the critical CO2 two-stage compression refrigeration system simulation model. LabVIEW software was used to write simulation programs, and the operation of the refrigeration system under different working conditions was simulated through different parameter Settings. Data analysis of the simulation results was conducted to explore the main factors that affect the COP of the system. The results show that the COP of the system increases with the rise of suction superheat of the compressor. As the evaporation temperature increases, the COP of the system gradually increases. There is an optimal intermediate pressure corresponding to COP

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Section: Fundingmentioning

confidence: 97%

Performance Analysis of a Carbon Dioxide Transcritical Two-Stage Compression Refrigeration System

Wei,

Wang,

Xie

et al. 2023

Advances in Transdisciplinary Engineering

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“…Currently, research on DMS is often used as one of the measures to improve the efficiency of CO2 cycling. Sun et al [21] proposed a transcritical R744 refrigeration cycle with expander mechanical superheat coupling. Research has shown that selecting a reasonable degree of superheat and pressure difference before and after the expander can significantly improve the performance coefficient of the R744 refrigeration cycle and reduce emission pressure.…”

Section: Research Progress On Transcritical Co2 Cycle With Dedicated ...mentioning

confidence: 99%

Review of dedicated mechanical subcooling methods for transcritical CO2 refrigeration and heat pump cycles

Lu,

Ma,

2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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The transcritical CO2 cycle mode has become one of the most popular research topics in the refrigeration field due to its advantages such as environmental friendliness, high-temperature heating performance, and adaptability to low environmental temperatures. This article discusses the thermodynamic principles and research progress of DMS technology for transcritical CO2 refrigeration heat pumps, providing reference for academic research and engineering applications. The research results indicate that the dedicated mechanical subcooling technology (DMS) for the transcritical CO2 cycle has broad development prospects in the field of refrigeration and heating. DMS technology can increase the COP of the transcritical CO2 cycle by more than 20%, and in some scenarios, it can already achieve the effect of replacing artificial synthetic refrigerants.

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“…The expansion device can be replaced by an expander for work recovery. The performance improvements are between 6% [65] and 12% [66] with R134a, 10% to 15% with CO 2 [67], and reported up to 30% with a CO 2 transcritical cycle [68]. The ejector technology was implemented as a booster for an R1234yf cycle with a maximum of 22% COP improvement [69] and a 38% increase in second-law efficiency [70].…”

Section: Enhanced Refrigeration Cyclesmentioning

confidence: 99%

A Review of Energy-Efficient Technologies and Decarbonating Solutions for Process Heat in the Food Industry

Faraldo,

Byrne

2024

Energies

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Heat is involved in many processes in the food industry: drying, dissolving, centrifugation, extraction, cleaning, washing, and cooling. Heat generation encompasses nearly all processes. This review first presents two representative case studies in order to identify which processes rely on the major energy consumption and greenhouse gas (GHG) emissions. Energy-saving and decarbonating potential solutions are explored through a thorough review of technologies employed in refrigeration, heat generation, waste heat recovery, and thermal energy storage. Information from industrial plants is collected to show their performance under real conditions. The replacement of high-GWP (global warming potential) refrigerants by natural fluids in the refrigeration sector acts to lower GHG emissions. Being the greatest consumers, the heat generation technologies are compared using the levelized cost of heat (LCOH). This analysis shows that absorption heat transformers and high-temperature heat pumps are the most interesting technologies from the economic and decarbonation points of view, while waste heat recovery technologies present the shortest payback periods. In all sectors, energy efficiency improvements on components, storage technologies, polygeneration systems, the concept of smart industry, and the penetration of renewable energy sources appear as valuable pathways.

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Performance analysis of a new transcritical R744 refrigeration cycle with expander-mechanical overheating

Cited by 8 publications

References 30 publications

Performance Analysis of a Carbon Dioxide Transcritical Two-Stage Compression Refrigeration System

Performance Analysis of a Carbon Dioxide Transcritical Two-Stage Compression Refrigeration System

Review of dedicated mechanical subcooling methods for transcritical CO2 refrigeration and heat pump cycles

A Review of Energy-Efficient Technologies and Decarbonating Solutions for Process Heat in the Food Industry

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