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Journal articles on the topic 'Transcritical CO2'

Author: Grafiati
Published: 6 September 2023

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1

Liu, Ying Fu, Chun Jing Geng, and Guang Ya Jin. "Vortex Tube Expansion Transcritical CO2 Heat Pump Cycle." Applied Mechanics and Materials 190-191 (July 2012): 1340–44. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.1340.

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The application of natural refrigerant CO2 is of great significance to reduce the greenhouse effect and ozone depletion. Transcritical CO2 heat pump cycle is presently an important aspect of natural refrigerant alternatives research. In this paper, a vortex tube expansion transcritical CO2 heat pump cycle is established and compared to that of the transcritical CO2 refrigeration cycle with throttle valve. Thermodynamic analysis results indicate that the system performance of vortex tube expansion transcritical CO2 heat pump cycle is better than the transcritical CO2 heat pump cycle with thrott
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2

Yang, Dazhang, Yang Li, Jing Xie, and Jinfeng Wang. "Research and application progress of transcritical CO2 refrigeration cycle system: a review." International Journal of Low-Carbon Technologies 17 (December 8, 2021): 245–56. http://dx.doi.org/10.1093/ijlct/ctab086.

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Abstract CO2 refrigerant and its transcritical cycle system have become the research focus in the refrigeration field due to their advantages of environmentally friendly, safe and low environmental temperature adaptability. This paper summarizes the research progress on the modified methods for the defects of basic transcritical CO2 refrigeration cycle system in recent years. Meanwhile, the technical status of transcritical CO2 refrigeration technology in commercial supermarket refrigeration, heat pump system, automobile air conditioning and artificial ice rink is discussed in detail. Finally,
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Yang, Dazhang, Yang Li, Jing Xie, and Jinfeng Wang. "Research and application progress of transcritical CO2 refrigeration cycle system: a review." International Journal of Low-Carbon Technologies 17 (December 8, 2021): 245–56. http://dx.doi.org/10.1093/ijlct/ctab086.

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Abstract CO2 refrigerant and its transcritical cycle system have become the research focus in the refrigeration field due to their advantages of environmentally friendly, safe and low environmental temperature adaptability. This paper summarizes the research progress on the modified methods for the defects of basic transcritical CO2 refrigeration cycle system in recent years. Meanwhile, the technical status of transcritical CO2 refrigeration technology in commercial supermarket refrigeration, heat pump system, automobile air conditioning and artificial ice rink is discussed in detail. Finally,
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4

Belman-Flores, J. M., V. H. Rangel-Hernández, V. Pérez-García, A. Zaleta-Aguilar, Qingping Fang, and D. Méndez-Méndez. "An Advanced Exergoeconomic Comparison of CO2-Based Transcritical Refrigeration Cycles." Energies 13, no. 23 (2020): 6454. http://dx.doi.org/10.3390/en13236454.

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CO2-based transcritical refrigeration cycles are currently gaining significant research attention, as they offer a viable solution to the use of natural refrigerants (e.g., CO2). However, there are almost no papers that offer an exergoeconomic comparison between the different configurations of these types of systems. Accordingly, the present work deals with a comparative exergoeconomic analysis of four different CO2-based transcritical refrigeration cycles. In addition, the work is complemented by an analysis of the CO2 abatement costs. The influences of the variation of the evaporating temper
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5

Feng, Fan, Ze Zhang, Xiufang Liu, Changhai Liu, and Yu Hou. "The Influence of Internal Heat Exchanger on the Performance of Transcritical CO2 Water Source Heat Pump Water Heater." Energies 13, no. 7 (2020): 1787. http://dx.doi.org/10.3390/en13071787.

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The characteristics of the transcritical CO2 heat pump water heater (HPWH) system are; a lower inlet hot water temperature (Ti-hw) (sometimes this is lower than the water source temperature), and an outlet gas cooler temperature (To-gc) which is affected by the Ti-hw and often lower than the critical temperature. In order to study the effects of the internal heat exchanger (IHX) on the operational performance of the transcritical CO2 HPWH when To-gc is low, a transcritical CO2 water source HPWH experiment platform is established to conduct experimental research and comparative analysis on the
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6

Sarkar, Jahar. "Performance improvement of double-tube gas cooler in CO2 refrigeration system using nanofluids." Thermal Science 19, no. 1 (2015): 109–18. http://dx.doi.org/10.2298/tsci120702121s.

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The theoretical analyses of the double-tube gas cooler in transcritical carbon dioxide refrigeration cycle have been performed to study the performance improvement of gas cooler as well as CO2 cycle using Al2O3, TiO2, CuO and Cu nanofluids as coolants. Effects of various operating parameters (nanofluid inlet temperature and mass flow rate, CO2 pressure and particle volume fraction) are studied as well. Use of nanofluid as coolant in double-tube gas cooler of CO2 cycle improves the gas cooler effectiveness, cooling capacity and COP without penalty of pumping power. The CO2 cycle yields best per
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7

Liu, Ying Fu, and Guang Ya Jin. "Vortex Tube Expansion Two-Stage Transcritical CO2 Refrigeration Cycle." Advanced Materials Research 516-517 (May 2012): 1219–23. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1219.

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Use of vortex tube as an expansion device in transcritical CO2 cycle could reduce the throttle loss and improve the coefficient of performance. In this paper, a vortex tube expansion two-stage transcritical CO2 refrigeration cycle(VTTC) is established and compared to that of the two-stage transcritical CO2 refrigeration cycle with throttle valve(TVTC). Thermodynamic analysis results indicate that there is also an optimum heat rejection pressure for the vortex tube cycle, and the COP improvement is 2.4%~16.3% at given conditions. Decrease in evaporation temperature or increase in gas-cooler out
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8

Fukuta, Mitsuhiro, Yuki Nakamura, and Tadashi Yanagisawa. "Characteristics of CO2 transcritical expansion process." HVAC&R Research 19, no. 7 (2013): 767–78. http://dx.doi.org/10.1080/10789669.2013.833544.

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9

SARKAR, JAHAR. "TRANSCRITICAL CO2 REFRIGERATION SYSTEMS: COMPARISON WITH CONVENTIONAL SOLUTIONS AND APPLICATIONS." International Journal of Air-Conditioning and Refrigeration 20, no. 04 (2012): 1250017. http://dx.doi.org/10.1142/s2010132512500174.

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Carbon dioxide (CO2) is one of the natural refrigerants which can be used as working fluid in various refrigeration applications along with the ammonia and hydrocarbons due to its eco-friendliness, higher volumetric capacity, good heat transfer properties, etc. The present article consists of two parts: A detailed comparative study of CO2 -based transcritical refrigeration systems with conventional refrigerants-based systems in terms of both thermodynamic and heat transfer performances, and review of both theoretical and experimental researches on transcritical CO2 vapor compression cycle for
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10

Verma, Abhishek, S. C. Kaushik, and S. K. Tyagi. "Thermodynamic Analysis of a Combined Single Effect Vapour Absorption System and tc-CO2 Compression Refrigeration System." HighTech and Innovation Journal 2, no. 2 (2021): 87–98. http://dx.doi.org/10.28991/hij-2021-02-02-02.

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Transcritical CO2 refrigeration system is coupled with the single effect vapour absorption with LiBr-water as a working pair having an objective to enhance the performance of low temperature transcritical refrigeration system while using natural working pair and to reduce the electricity consumption to produce low temperature refrigeration. The high grade waste heat rejected in the gas cooler of tc-CO2 compression refrigeration system (TCRS) is utilized to run the single effect vapour absorption system (SEVAR) to enhance the energy efficiency of the system. The gas cooler in the transcritical
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11

Bellos, Evangelos, and Christos Tzivanidis. "CO2 Transcritical Refrigeration Cycle with Dedicated Subcooling: Mechanical Compression vs. Absorption Chiller." Applied Sciences 9, no. 8 (2019): 1605. http://dx.doi.org/10.3390/app9081605.

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The objective of this paper is the comparison of two dedicated subcooling methods, after the gas cooler, in a CO2 transcritical refrigeration system. The use of vapor compression refrigeration with R134a for subcooling is the first method, and the second is the use of an absorption chiller that operates with a LiBr-H2O working pair. The examined systems are compared energetically and exegetically with the reference transcritical CO2 refrigeration cycle without subcooling. The analysis is conducted for different operating scenarios and in every case, the system is optimized by selecting the pro
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12

Belusko, Martin, Raymond Liddle, Alemu Alemu, Edward Halawa, and Frank Bruno. "Performance Evaluation of a CO2 Refrigeration System Enhanced with a Dew Point Cooler." Energies 12, no. 6 (2019): 1079. http://dx.doi.org/10.3390/en12061079.

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Dew point cooling (DPC) is a novel indirect evaporative cooling concept capable of delivering air temperatures approaching the dew point. Coupling this technology with CO2 refrigeration is well suited to minimising transcritical operation when the coefficient of performance (COP) is dramatically reduced in hot climates. A substantial experimental program was conducted to characterise this combination by testing a 20 kW CO2 refrigeration system subject to ambient temperatures above 40 °C. It was demonstrated that DPC operation not only avoided transcritical operation during such weather conditi
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13

Rony, Rajib, Huojun Yang, Sumathy Krishnan, and Jongchul Song. "Recent Advances in Transcritical CO2 (R744) Heat Pump System: A Review." Energies 12, no. 3 (2019): 457. http://dx.doi.org/10.3390/en12030457.

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Heat pump (HP) is one of the most energy efficient tools for address heating and possibly cooling needs in buildings. Growing environmental concerns over conventional HP refrigerants, chlorofluorocarbons (CFCs), and hydrofluorocarbons (HFCs) have forced legislators and researchers to look for alternatives. As such, carbon dioxide (R744/CO2) has come to light due to its low global warming potential (GWP) and zero ozone depleting characteristics. Even though CO2 is environmentally benign, the performance of CO2 HP has been of concern since its inception. To improve the performance of CO2 HP, res
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14

Ning, Jing Hong, and Sheng Chun Liu. "Design and Performance Analysis on CO2 Combined System in Supermarket." Advanced Materials Research 433-440 (January 2012): 1219–25. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.1219.

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This paper reports a combined space cooling, space heating, water heating and food refrigeration system (named CO2 combined system) in supermarket. This system using CO2 as the working fluid consists of a two-stage CO2 transcritical cycle used for food refrigeration, a single-stage CO2 transcritical cycle for space cooling in summer and space heating in winter. The waste heat emitted from the CO2 gas cooling in food refrigeration cycle and space cooling and space heating cycles is recovered by heat recover exchanger and is used to provide hot water for space heating and for general usage, such
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15

Wu, Zhongkai, Feifei Bi, Jiyou Fei, Zecan Zheng, Yulong Song, and Feng Cao. "The Collaborative Optimization of the Discharge Pressure and Heat Recovery Rate in a Transcritical CO2 Heat Pump Used in Extremely Low Temperature Environment." Energies 16, no. 4 (2023): 2059. http://dx.doi.org/10.3390/en16042059.

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Considering the excellent environmental properties and heating capability under wide running conditions of the natural fluid CO2, the transcritical CO2 heat pump system has widely been used in the application of water heaters, commercial heating and cooling, electric vehicle thermal management, etc. Since the performance was highly affected by the discharge pressure and heat recovery rate in a transcritical CO2 system, the collaborative optimization of these two parameters was analyzed in detail in this study. The results showed that the optimal value of the system heating COP, which was the r
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16

Ji, Hongzeng, Jinchen Pei, Jingyang Cai, Chen Ding, Fen Guo, and Yichun Wang. "Review of Recent Advances in Transcritical CO2 Heat Pump and Refrigeration Cycles and Their Development in the Vehicle Field." Energies 16, no. 10 (2023): 4011. http://dx.doi.org/10.3390/en16104011.

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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 wit
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17

Liu, Ying Fu, Peng Yu Shen, and Guang Ya Jin. "Experimental Investigation on Transcritical CO2 Refrigeration System." Advanced Materials Research 516-517 (May 2012): 1156–59. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1156.

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The application of natural refrigerant CO2 is of great significance to reduce the greenhouse effect and ozone depletion. Transcritical CO2 refrigeration cycle is presently an important aspect of natural refrigerant alternatives research. In this paper, the transcritical CO2 refrigeration cycle system is experimentally studied, effect on performance of heat rejection pressure, gas-cooler outlet temperature and evaporation temperature is analyzed. The experimental results show that there is an optimum high pressure to achieve the maximum COP, the evaporation temperature and gas-cooler exit tempe
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18

Zhang, Chun-Lu, and Liang Yang. "Modeling of Supercritical CO2 Flow Through Short Tube Orifices." Journal of Fluids Engineering 127, no. 6 (2005): 1194–98. http://dx.doi.org/10.1115/1.2060738.

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The transcritical cycle of carbon dioxide (CO2) is a promising alternative approach to heat pumps and automobile air conditioners. As an expansion device, the short tube orifice in a transcritical CO2 system usually receives supercritical fluid at the entrance and discharges a two-phase mixture at the exit. In this work, a two-fluid model (TFM) is developed for modeling the flow characteristics of supercritical CO2 through the short tube orifice. The deviations between the TFM predictions and the measured mass flow rates are within ±20%. Meanwhile, the TFM predicts reasonable pressure, tempera
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19

Li, Daqing, and Eckhard A. Groll. "Transcritical CO2 refrigeration cycle with ejector-expansion device." International Journal of Refrigeration 28, no. 5 (2005): 766–73. http://dx.doi.org/10.1016/j.ijrefrig.2004.10.008.

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20

Barroca, Pierre, Armin Hafner, Bart Verlaat, et al. "An Ultra-Low Temperature Transcritical R744 Refrigeration System for Future Detectors at CERN LHC." Applied Sciences 11, no. 16 (2021): 7399. http://dx.doi.org/10.3390/app11167399.

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The cooling systems of the future tracking detectors of the ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN will be entirely based on CO2 refrigeration technology. The system is a booster refrigeration system, composed of a two stage primary part with transcritical R744 equipment and a low temperature secondary CO2 pumped loop. The primary refrigeration sub-system installed on surface provides cold R744 at −53∘C to the CO2 pumped loops installed 100 m underground and rejects the heat exchanged. The process must be reliable and remain stable regardless of the amount of heat
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21

Wang, Yikai, Yifan He, Yulong Song, Xiang Yin, Feng Cao, and Xiaolin Wang. "Energy and Exergy Analysis of the Air Source Transcritical CO2 Heat Pump Water Heater Using CO2-Based Mixture as Working Fluid." Energies 14, no. 15 (2021): 4470. http://dx.doi.org/10.3390/en14154470.

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Given the large demand nowadays for domestic hot water, and its impact on modern building energy consumption, air source transcritical CO2 heat pumps have been extensively adopted for hot water production. Since their system efficiency is limited by significant irreversibility, a CO2-based mixture could offer a promising drop-in technology to overcome this deficiency without increasing system complexity. Although many CO2 blends have been studied in previously published literature, little has been presented about the CO2/R32 mixture. Therefore, a proposed mixture for use in transcritical CO2 h
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22

Fazelpour, Farivar. "Energetic and exergetic analyses of carbon dioxide transcritical refrigeration systems for hot climates." Thermal Science 19, no. 3 (2015): 905–14. http://dx.doi.org/10.2298/tsci121007026f.

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In the last two decades many scientific papers and reports have been published in the field of the application of the carbon dioxide as a refrigerant for refrigeration systems and heat pumps. Special attention has been paid to the transcritical cycle. However, almost no papers discussed such cycles for hot climates, i.e., when the temperature of the environment is higher than 40?? during a long period of time. This paper deals with the energetic and exergetic evaluation of a CO2 refrigeration system operating in a transcritical cycle under hot climatic conditions. The performance and exergy ef
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23

Bai, Wanjin, and Xiaoxiao Xu. "Comparative analyses of two improved CO2 combinated cooling, heating, and power systems driven by solar energy." Thermal Science 22, Suppl. 2 (2018): 693–700. http://dx.doi.org/10.2298/tsci171008054b.

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To make use of solar energy fully and efficiently, the two improved combined cooling, heating, and power systems (CCHP) are proposed by adding a gas heater and an extraction turbine, based on the transcritical CO2 ejector refrigeration system. A relatively high pressure fluid is extracted by the extraction turbine as a primary stream of ejector to improve the ejector performance. In the meantime, the gas heater absorbs low temperature exhaust heat to increase the extraction turbine?s output work. Comparative studies on the thermal efficiency and exergy efficiency of the two improved systems sh
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24

Catalán-Gil, J., L. Nebot-Andrés, D. Sánchez, R. Llopis, R. Cabello, and D. Calleja-Anta. "Improvements in CO2 Booster Architectures with Different Economizer Arrangements." Energies 13, no. 5 (2020): 1271. http://dx.doi.org/10.3390/en13051271.

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CO2 transcritical booster architectures are widely analyzed to be applied in centralized commercial refrigeration plants in consonance with the irrevocable phase-out of HFCs. Most of these analyses show the limitations of CO2 cycles in terms of energy efficiency, especially in warm countries. From the literature, several improvements have been proposed to raise the booster efficiency in high ambient temperatures. The use of economizers is an interesting technique to reduce the temperature after the gas cooler and to improve the energy efficiency of transcritical CO2 cycles. The economizer cool
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25

Ayub, Abubakr, Costante M. Invernizzi, Gioele Di Marcoberardino, Paolo Iora, and Giampaolo Manzolini. "Carbon Dioxide Mixtures as Working Fluid for High-Temperature Heat Recovery: A Thermodynamic Comparison with Transcritical Organic Rankine Cycles." Energies 13, no. 15 (2020): 4014. http://dx.doi.org/10.3390/en13154014.

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This study aims to provide a thermodynamic comparison between supercritical CO2 cycles and ORC cycles utilizing flue gases as waste heat source. Moreover, the possibility of using CO2 mixtures as working fluids in transcritical cycles to enhance the performance of the thermodynamic cycle is explored. ORCs operating with pure working fluids show higher cyclic thermal and total efficiencies compared to supercritical CO2 cycles; thus, they represent a better option for high-temperature waste heat recovery provided that the thermal stability at a higher temperature has been assessed. Based on the
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26

Liu, Liuchen, Qiguo Yang, and Guomin Cui. "Supercritical Carbon Dioxide(s-CO2) Power Cycle for Waste Heat Recovery: A Review from Thermodynamic Perspective." Processes 8, no. 11 (2020): 1461. http://dx.doi.org/10.3390/pr8111461.

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Supercritical CO2 power cycles have been deeply investigated in recent years. However, their potential in waste heat recovery is still largely unexplored. This paper presents a critical review of engineering background, technical challenges, and current advances of the s-CO2 cycle for waste heat recovery. Firstly, common barriers for the further promotion of waste heat recovery technology are discussed. Afterwards, the technical advantages of the s-CO2 cycle in solving the abovementioned problems are outlined by comparing several state-of-the-art thermodynamic cycles. On this basis, current re
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27

Tao, Yong Qing, Yang Shi, Si Min Zhang, et al. "One-Step Effective Segregation of Ginger Essential Oil and Gingerol in Oleoresin Ginger via Transcritical CO2." Advanced Materials Research 699 (May 2013): 207–11. http://dx.doi.org/10.4028/www.scientific.net/amr.699.207.

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We developed a supercritical CO2 extraction procession and determinated ginger essential oil contents from the ginger oleoresin to explore the effects of temperatures or pressures on the supercritical CO2 extraction. Our research indicated that pressures had little effect on the liquid CO2 extraction capacity. However, supercritical CO2 extraction capacity was affected dramatically by the variant pressures. Additionally, changing pressures or temperature pushed the CO2 into transcritical isolation state. Under this circumstance, we not only ensured the yield of ginger oleoresin, but also did w
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28

KADAM, ASHISH, ATUL PADALKAR, and S. MARTÍNEZ-BALLESTER. "EFFECT OF CONTROL OPTIMIZATION OF CO2 TRANSCRITICAL SPLIT AIR CONDITIONER ON THERMAL COMFORT OF OCCUPANTS IN SINGLE ZONE ROOM." International Journal of Air-Conditioning and Refrigeration 22, no. 01 (2014): 1450006. http://dx.doi.org/10.1142/s2010132514500060.

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Energy, environment and economics are considered as very vital parameters for the evaluation of an air conditioning system and associated indoor environment. The cooling performance of an air conditioner has an effect on the thermal comfort of occupants in the room. Transcritical CO 2 air conditioner (System B) with a control for gas cooler pressure has better energy performance than a transcritical CO 2 air conditioner (System A) without any control on the gas cooler pressure. An experimental technique is used for generating performance equations to define transcritical CO 2 air conditioners
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29

Okasha, Ahmed, Norbert Müller, and Kalyanmoy Deb. "Bi-objective optimization of transcritical CO2 heat pump systems." Energy 247 (May 2022): 123469. http://dx.doi.org/10.1016/j.energy.2022.123469.

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30

Bush, John, Mohamed Beshr, Vikrant Aute, and Reinhard Radermacher. "Experimental evaluation of transcritical CO2 refrigeration with mechanical subcooling." Science and Technology for the Built Environment 23, no. 6 (2017): 1013–25. http://dx.doi.org/10.1080/23744731.2017.1289056.

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31

Sarkar, Jahar. "Optimization of ejector-expansion transcritical CO2 heat pump cycle." Energy 33, no. 9 (2008): 1399–406. http://dx.doi.org/10.1016/j.energy.2008.04.007.

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32

Yang, Jun Lan, Yi Tai Ma, Min Xia Li, and Jun Hua. "Modeling and simulating the transcritical CO2 heat pump system." Energy 35, no. 12 (2010): 4812–18. http://dx.doi.org/10.1016/j.energy.2010.09.007.

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33

Ersoy, H. Kursad, and Nagihan Bilir. "Performance characteristics of ejector expander transcritical CO2 refrigeration cycle." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 226, no. 5 (2012): 623–35. http://dx.doi.org/10.1177/0957650912446547.

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34

Sarkar, J., Souvik Bhattacharyya, and M. Ram Gopal. "Irreversibility minimization of heat exchangers for transcritical CO2 systems." International Journal of Thermal Sciences 48, no. 1 (2009): 146–53. http://dx.doi.org/10.1016/j.ijthermalsci.2008.02.007.

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35

Cen, Jiwen, Pei Liu, and Fangming Jiang. "A novel transcritical CO2 refrigeration cycle with two ejectors." International Journal of Refrigeration 35, no. 8 (2012): 2233–39. http://dx.doi.org/10.1016/j.ijrefrig.2012.07.001.

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36

Fartaj, Amir, David S. K. Ting, and Wendy W. Yang. "Second law analysis of the transcritical CO2 refrigeration cycle." Energy Conversion and Management 45, no. 13-14 (2004): 2269–81. http://dx.doi.org/10.1016/j.enconman.2003.07.001.

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37

Hwang, Yunho, Jun-Pyo Lee, and Reinhard Radermacher. "Oil distribution in a transcritical CO2 air-conditioning system." Applied Thermal Engineering 27, no. 14-15 (2007): 2618–25. http://dx.doi.org/10.1016/j.applthermaleng.2007.01.019.

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38

Shao, Liang-Liang, Zi-Yang Zhang, and Chun-Lu Zhang. "Constrained optimal high pressure equation of CO2 transcritical cycle." Applied Thermal Engineering 128 (January 2018): 173–78. http://dx.doi.org/10.1016/j.applthermaleng.2017.09.023.

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39

Song, Yulong, Haidan Wang, and Feng Cao. "Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO2 System with a Dedicated Transcritical CO2 Subcooler." Energies 13, no. 2 (2020): 309. http://dx.doi.org/10.3390/en13020309.

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As a natural fluid with superior environment advantages, CO2 is used to constitute a dual transcritical system to reduce performance deterioration under high gas-cooler outlet temperature. Aiming at the system configuration, improvement potential, and optimization, the proposed system is deeply analyzed, and corresponding coupling models are presented in detail. First, the veracity of simulation models is completely verified by comparing with previous measurements. Then, the existence of the optimal intermediate temperature is validated, while the optimal values are found to increase with the
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40

Elbarghthi, Anas F. A., and Václav Dvořák. "Evaluation of Various Ejector Profiles on CO2 Transcritical Refrigeration System Performance." Entropy 24, no. 9 (2022): 1173. http://dx.doi.org/10.3390/e24091173.

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This study examines the potential impact of the different ejector profiles on the CO2 transcritical cooling system to highlight the contribution of the multi-ejector in the system performance improvement. The research compares the implementation of an ejector-boosted CO2 refrigeration system over the second-generation layout at a motive flow temperature of 35 °C and discharge pressure of 90 bar to account for the transcritical operation mode. The result revealed a significant energy saving by reducing the input power to the maximum of 8.77% when the ejector was activated. Furthermore, the mult
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41

Liu, Jinghang, Aofang Yu, Xinxing Lin, Wen Su, and Shaoduan Ou. "Performances of Transcritical Power Cycles with CO2-Based Mixtures for the Waste Heat Recovery of ICE." Entropy 23, no. 11 (2021): 1551. http://dx.doi.org/10.3390/e23111551.

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In the waste heat recovery of the internal combustion engine (ICE), the transcritical CO2 power cycle still faces the high operation pressure and difficulty in condensation. To overcome these challenges, CO2 is mixed with organic fluids to form zeotropic mixtures. Thus, in this work, five organic fluids, namely R290, R600a, R600, R601a, and R601, are mixed with CO2. Mixture performance in the waste heat recovery of ICE is evaluated, based on two transcritical power cycles, namely the recuperative cycle and split cycle. The results show that the split cycle always has better performance than th
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Song, Yulong, Qinfei Sun, Shuo Yang, Qijing Xing, Ling Cheng, and Feng Cao. "The theoretical and experimental research on the thermodynamic process in transcritical carbon dioxide piston compressor." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 233, no. 2 (2018): 267–79. http://dx.doi.org/10.1177/0954408918777172.

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The general mathematical model of the transcritical CO2 compressor was presented to assess the compressor efficiencies including isentropic efficiency and volumetric efficiency based on the thermodynamic theories and compressor structures. Furthermore, the prototype of the transcritical CO2 system was established and relative measurements were carried out to evaluate the precision of the simulation. Results showed that the volumetric efficiency of the compressor kept decreasing while the isentropic efficiency increased first and then kept almost constant and even declined with the increase in
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43

Sarkar, Jahar, and Dnyanesh Joshi. "Extended Exergy Analysis Based Comparison of Subcritical and Transcritical Refrigeration Systems." International Journal of Air-Conditioning and Refrigeration 24, no. 02 (2016): 1650009. http://dx.doi.org/10.1142/s2010132516500097.

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The main purpose of this study is to apply advanced exergy analysis to the transcritical CO2 vapor compression refrigeration system, and compare with the analysis of subcritical cycle using ammonia and R404a. Endogenous, exogenous, avoidable and unavoidable exergy destructions are determined for each component of these systems. For CO2 system, compressor contributes highest avoidable endogenous exergy destruction and gas cooler contributes highest avoidable exogenous exergy destruction. It is concluded that compressor is the first component for CO2 and R404a, and evaporator is the first compon
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44

Nebot-Andrés, Laura, Daniel Calleja-Anta, Daniel Sánchez, Ramón Cabello, and Rodrigo Llopis. "Thermodynamic Analysis of a CO2 Refrigeration Cycle with Integrated Mechanical Subcooling." Energies 13, no. 1 (2019): 4. http://dx.doi.org/10.3390/en13010004.

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Different alternatives are being studied nowadays in order to enhance the behavior of transcritical CO2 refrigeration plants. Among the most studied options, subcooling is one of the most analyzed methods in the last years, increasing cooling capacity and Coefficient Of Performance (COP), especially at high hot sink temperatures. A new cycle, called integrated mechanical subcooling cycle, has been developed, as a total-CO2 solution, to provide the subcooling in CO2 transcritical refrigeration cycles. It corresponds to a promising solution from the point of view of energy efficiency. The purpos
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45

Kozioł, Joachim, Wiesław Gazda, and Łukasz Wilżyński. "Energy efficiency for the transcritical compression CO2 cycle with the use of the ejector as the first stage of the compression." Archives of Thermodynamics 31, no. 4 (2010): 61–69. http://dx.doi.org/10.2478/v10173-010-0028-3.

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Energy efficiency for the transcritical compression CO2cycle with the use of the ejector as the first stage of the compressionAn analysis of energy efficiency for transcritical compression unit with CO2 (R744) as the refrigerant has been carried out using empirical operating characteristics for the two-phase ejector. The first stage of the refrigerant compression is carried out in the ejector. The criterion adopted for the estimation of energy efficiency for the cycle is the coefficient of performance COP. The analysis is performed for the heat pump and refrigeration systems. The results of CO
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46

Zhou, Tang, Zhang, and Li. "Thermodynamic Analysis of the Air-Cooled Transcritical Rankine Cycle Using CO2/R161 Mixture Based on Natural Draft Dry Cooling Towers." Energies 12, no. 17 (2019): 3342. http://dx.doi.org/10.3390/en12173342.

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Heat rejection in the hot-arid area is of concern to power cycles, especially for the transcritical Rankine cycle using CO2 as the working fluid in harvesting the low-grade energy. Usually, water is employed as the cooling substance in Rankine cycles. In this paper, the transcritical Rankine cycle with CO2/R161 mixture and dry air cooling systems had been proposed to be used in arid areas with water shortage. A design and rating model for mixture-air cooling process were developed based on small-scale natural draft dry cooling towers. The influence of key parameters on the system’s thermodynam
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47

Taslimi Taleghani, Sahar, Mikhail Sorin, and Sébastien Poncet. "Analysis and Optimization of Exergy Flows inside a Transcritical CO2 Ejector for Refrigeration, Air Conditioning and Heat Pump Cycles." Energies 12, no. 9 (2019): 1686. http://dx.doi.org/10.3390/en12091686.

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In this study, the exergy analysis of a CO2 (R744) two-phase ejector was performed using a 1D model for both single and double choking conditions. The impact of the back pressure on the exergy destruction and exergy efficiencies was presented to evaluate the exergy performance under different working conditions. The results of two exergy performance criteria (transiting exergy efficiency and Grassmann exergy efficiency) were compared for three modes of an ejector functioning: Double choking, single choking and at the critical point. The behavior of three thermodynamic metrics: Exergy produced,
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48

Mu, Deying, Yuanlong Liu, Ruhong Li, Quanxin Ma, and Changsong Dai. "Transcritical CO2 extraction of electrolytes for lithium-ion batteries: optimization of the recycling process and quality–quantity variation." New Journal of Chemistry 41, no. 15 (2017): 7177–85. http://dx.doi.org/10.1039/c7nj00771j.

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GOMRI, Rabah. "Energy and Exergy Analyses of Different Transcritical CO2 Refrigeration Cycles." El-Cezeri Fen ve Mühendislik Dergisi 5, no. 2 (2018): 425–36. http://dx.doi.org/10.31202/ecjse.402904.

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50

Naveen, Michael Roger. "Experimental Investigation of a Combined Power Refrigeration Transcritical CO2 Cycle." Indian Journal of Science and Technology 8, no. 1 (2015): 1–4. http://dx.doi.org/10.17485/ijst/2015/v8i31/84313.

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