An Experimental Study on Evaporative Condenser in Air Conditioning Systems Using R744
Email tác giả liên hệ:
trungdang@hcmute.edu.vnDOI:
https://doi.org/10.54644/jte.78B.2023.1259Từ khóa:
R744, air conditioning, evaporative condenser, COP, subcriticalTóm tắt
Nowadays, the use of refrigerants has low GWP and zero ODP applying refrigeration and air conditioning systems is an important concern. There has been a lot of research taking about refrigeration systems using R744. In this study, we focus on the use of the mix of water and air for an evaporative condenser through an experiment to study the heat transfer efficiency between water and the R744. The results of this study show that it is feasible to use water to cool down R744 to a subcritical state. The data obtained show that the R744 temperature at the outlet condenser gradually decreases with each change in the number of tube layers, the condensing pressure is stable at 73 bar with a pressure drop of 0.4 bar. The water temperature is stable between 26oC and 28oC, and the air outlet temperature from the indoor unit gradually decreases from 28oC to 16.8oC. With the 3 configurations of the condenser, the coefficient of performance gradually increases from 3.6 to 4.5 respectively.
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Y. Liu, Y. Sun and D. Tang, "Analysis of a CO2 Transcritical Refrigeration Cycle with a Vortex Tube Expansion," Sustainability, vol. 11, no. 7, p. 2021, Apr. 2019.
E. Bellos and C. Tzivanidis, "CO2 Transcritical Refrigeration Cycle with Dedicated Subcooling: Mechanical Compression vs Absorption Chiller," Applied Sciences, vol. 9, no. 8, p. 1605, Apr. 2019.
Y. Zhu, Y. Huang, C. Li, F. Zhang, and P. X. Jiang, "Experimental investigation on the performance of transcritical CO2 ejector–expansion heat pump water heater system," Energy Conversion and Management, vol. 167, pp. 147-155, Jul. 2018.
J. Q. Deng, P. X. Jiang, T. Lu, and W. Lu, "Particular characteristics of transcritical CO2 refrigeration cycle with an ejector," Applied Thermal Engineering, vol. 27, pp. 381–388, 2007.
Y. He, J. Deng, L. Zheng, and Z. Zhang, "Performance optimization of a transcritical CO2 refrigeration system using a controlled ejector," International Journal of Refrigeration, vol. 75, pp. 250-261, Mar. 2017.
J. Yang, L. Wang, Y. Han, X. Zhang, and Y. Du, "Simulation and Experimental Study of CO2 Transcritical Heat Pump System with Thermoelectric Subcooling," Designs, vol. 6, no. 6, p. 115, 2022.
M. Yari, and S.M.S Mahmoudi, "Thermodynamic analysis and optimization of novel ejector-expansion TRCC (transcritical CO2) cascade refrigeration cycles (Novel transcritical CO2 cycle)," Energy, vol. 36, pp. 6839-6850, 2011.
F. Z. Zhang, P. X. Jiang, Y. S. Lin, and Y. W. Zhang, "Efficiencies of subcritical and transcritical CO2 inverse cycles with and without an internal heat exchanger," Applied Thermal Engineering, vol. 31, pp. 432-438, 2011.
D. Sánchez, J. Patiño, C. S. Kock, R. Llopis, R. Cabello, and E. Torrella, "Energetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditions," Applied Thermal Engineering, vol. 66, pp. 227-238, 2014.
M. Rampazzo et al., "Energy-efficient operation of transcritical and subcritical CO2 inverse cycles via Extremum Seeking Control," Journal of Process Control, vol. 81, pp. 87–97, 2019.
X. Lei, R. Peng, Z. Guo, H. Li, K. Ali, and X. Zhou, "Experimental comparison of the heat transfer of carbon dioxide under subcritical and supercritical pressures," International Journal of Heat and Mass Transfer, vol. 152, pp. 119-562, 2020.
C. S. Kock, R. Llopis, D. Sanchez, R. Cabello, and E. Torrella, "Experimental evaluation of a R134a/ CO2 cascade refrigeration plant," Applied Thermal Engineering, vol. 73, pp. 39-48, 2014.
R. Llopis, C. Sanz-Kock, R. Cabello, D. Sanchez, and E. Torrella, "Experimental evaluation of an internal heat exchanger in a CO2 subcritical refrigeration cycle with gas-cooler," Applied Thermal Engineering, vol. 80, pp. 31-41, 2015.
Y. Zhang, Y. He, Y. Wang, X. Wu, M. Jia, and Y. Gong, "Experimental investigation of the performance of an R1270/CO2 cascade refrigerant system," International Journal of Refrigeration, vol. 114, pp. 175–180, 2020.
G. Boccardi et al., "Experimental performance evaluation for a carbon dioxide light commercial cooling application under transcritical and subcritical conditions," Applied Thermal Engineering, vol. 54, pp. 528-535, 2013.
W. Wu, H. M. Skye, and J. J. Dyreby, "Modeling and experiments for a CO2 ground-source heat pump with subcritical and transcritical operation," Energy Conversion and Management, vol. 243, pp. 114-420, Sep. 2021.
G. Gautam, G. Kumar, S.S. Sahoo, "Performance improvement and comparisons of CO2 based adsorption cooling system using modified cycles employing various adsorbents: A comprehensive study of subcritical and transcritical cycles," International Journal of Refrigeration, vol. 112, pp. 136-154, Apr. 2020.
H. M. Getu, and P. K. Bansal, "Thermodynamic analysis of an R744/R717 cascade refrigeration system," International Journal of Refrigeration, vol. 31, pp. 45–54, 2008.
T. S. Lee, C. H. Liu, and T. W. Chen, "Thermodynamic analysis of optimal condensing temperature of cascade-condenser in CO2/ NH3 cascade refrigeration systems," International Journal of Refrigeration, vol. 29, pp. 1100-1108, 2006.
L. L. Shao, and C. L. Zhang, "Thermodynamic transition from subcritical to transcritical CO2 cycle," International Journal of Refrigeration, vol. 64, pp. 123-129, Apr. 2016.
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