Investigation on the effects of the optimal medium-temperature on the system performance in a transcritical CO2 system with a dedicated transcritical CO2 subcooler

Song, Yulong; Cui, Ce; Li, Mingjia; Cao, Feng

doi:10.1016/j.applthermaleng.2019.114846

Cited by 25 publications

(5 citation statements)

References 40 publications

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“…It has been observed that a 60% CO 2 -propane combination could grant comparable performances to R134a, which is mostly applied in traditional VC systems. It is important to state that CO 2 is non-flammable and non-toxic and has no controls obligation due to its low GWP [56]. Lastly, through effective control measures, these types of machinery operate safely over a long time by controlling the high side pressure and gas cooler outlet temperature.…”

Section: Discussionmentioning

confidence: 99%

Screening of Cooling Technologies in Europe: Alternatives to Vapour Compression and Possible Market Developments

et al. 2022

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The aim of this study is to investigate, review, and assess the recent advances of alternative cooling technologies using traditional vapor compression (VC) systems as a baseline. Around 99% of the final energy consumption used for cooling in the current European market (European Union plus the United Kingdom (EU27 + UK) is supplied by VC technologies. In comparison, the remaining 1% is produced by thermally driven heat pumps (TDHPs). This study focuses on providing a complete taxonomy of cooling technologies. While the EU heating sector is broadly explored in scientific literature, a significant lack of data and information is present in the cooling sector. This study highlights technologies that can potentially compete and eventually replace VC systems within the decade (2030). Among others, the most promising of these are membrane heat pump, transcritical cycle, Reverse Brayton (Bell Coleman cycle), and absorption cooling. However, the latter mentioned technologies still need further research and development (R&D) to become fully competitive with VC technologies. Notably, there are no alternative cooling technologies characterized by higher efficiency and less cost than VC technologies in the EU market.

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Section: Discussionmentioning

confidence: 99%

Screening of Cooling Technologies in Europe: Alternatives to Vapour Compression and Possible Market Developments

et al. 2022

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“…A similar system was presented by Song et al and the system performance was analyzed via simulation. The medium temperature, defined as the EXV inlet temperature, affects the main and sub-cycles' performance in opposite ways [115]. Figure 7 shows the COP variation of different cycles under different medium temperatures.…”

Section: Operation Control In Modified Cyclesmentioning

confidence: 99%

Review of Recent Advances in Transcritical CO2 Heat Pump and Refrigeration Cycles and Their Development in the Vehicle Field

Pei

Cai

et al. 2023

Energies

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Refrigerant substitution is an urgent need in the context of reducing carbon emissions and slowing global warming. CO2 is now being proposed as a promising solution based on its excellent properties and system performance, especially in low-temperature environments. This paper presents an overview of recent advances in system configuration and operation characteristics to improve the performance of transcritical CO2 heat pump and refrigeration systems. The paper first introduces the basic research background, system cycle, and thermodynamic characteristics. Secondly, CO2 cycle improvements with single modifications and modification combinations are reviewed. Then, some important operation characteristics and control methods are discussed. Additionally, the paper provides a detailed description of the development of transcritical CO2 heat pump and refrigeration systems in the vehicle field. At the end of this review, conclusions and opportunities for future work in this field are presented.

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“…Several scientists indicated that global warming and rising comfort expectations are the main drivers of the market under study. Another factor mentioned in this context is the energy efficiency of buildings, which has a low value (1−) due to the low renovation rates of the building stock in Europe and low new construction activities [24].…”

Section: Porter's Five Forces Analysismentioning

confidence: 99%

Potential Evolution of the Cooling Market in the EU27+UK: An Outlook until 2030

et al. 2022

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This study investigates insights concerning the future of the cooling market of the European Union (plus the United Kingdom) and its possible development for the upcoming decade (until 2030). In this manuscript, a qualitative model—Porter’s five forces analysis (PFFA)—and a quantitative tool—multi-criteria decision analysis (MCDA)—have been applied to produce a forecast and a corresponding validation technique. It has been observed that the MCDA tool came to a similar conclusion as the PFFA methodology, highlighting that, presumably, the cooling market will continue to grow moderately, mainly thanks to research and development (R&D) as the central driving force. Moreover, the latter is strictly connected with R&D developments, economic crises, and the welfare of the European population. Additionally, in this study, an extensive survey conducted on interviews of experts throughout each European country confirmed the slightly positive future developments forecast up to 2030 from the quantitative and qualitative methods mentioned above. The results of the study describe a steady growth of the cooling market in Europe until 2030 of about 1–2% annual increase, for a total gain of 24%.

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Investigation on the effects of the optimal medium-temperature on the system performance in a transcritical CO2 system with a dedicated transcritical CO2 subcooler

Cited by 25 publications

References 40 publications

Screening of Cooling Technologies in Europe: Alternatives to Vapour Compression and Possible Market Developments

Screening of Cooling Technologies in Europe: Alternatives to Vapour Compression and Possible Market Developments

Review of Recent Advances in Transcritical CO2 Heat Pump and Refrigeration Cycles and Their Development in the Vehicle Field

Potential Evolution of the Cooling Market in the EU27+UK: An Outlook until 2030

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