AN EXPERIMENTAL STUDY ON SUBCOOLING PROCESS OF A TRANSCRITICAL CO2 AIR CONDITIONING CYCLE WORKING WITH MICROCHANNEL EVAPORATOR

Abstract

An experimental study on subcooling process of a transcritical CO₂ air conditioning cycle working with microchannel evaporator was done. In this cycle there are two different subcoolers namely S1 and S2 were installed and tested. The experimental data show that the COP of the cycle working with the subcooler S2 is better which is at 7.2. The evaporator pressure, the subcooler pressure, the subcooling temperature and the compressor current corresponding to the above-mentioned COP are 44 bar, 75 bar, 26 ºC, and 2.4 A, respectively. A total comparison between the present study and other literatures was also indicated which confirms that the results gained by the present study look better.

Keywords

• Keywords: CO2 refrigerant,Air conditioning system,Subcooling,Heat transfer,Microchannel

References

1. [1] G. Lorentzen, The use of natural refrigerants: a complete solution to the CFC/HCFC predicament, Int. J. Refrig, 18, 1995,190 – 197.
2. [2] GouhuaKuang, Michael Ohadi, SerguieDessiatoun, Semi-Empirical Correlation of Gas Cooling Heat Transfer of Supercritical Carbon Dioxide in Microchannels, HVAC&R Research, 14, 2008, 861 – 870.
3. [3] D. Colorado a , J. A. Hernández, W. Rivera, “Comparative study of a cascade cycle for simultaneous refrigeration and heating ammonia, R134a, butane, propane, and CO2 as working fluids, International Journal of Sustainable Energy, 31, 2012, 365 – 381.
4. [4] D. B. Tuckerman, R.F.W. Pease, High-performance heat sinking for VLSI, IEEE Electron device letters, 2, 1981, 126 – 129.
5. [5] Xiumin Zhao, P.K. Bansal, Flow boiling heat transfer characteristics of CO2 at low temperatures, International Journal of Refrigeration, 30, 2007, 937 – 945.
6. [6] Lixin Cheng, John R. Thome, Cooling of microprocessors using flow boiling of CO2 in a micro-evaporator: Preliminary analysis and performance comparison, Applied Thermal Engineering, 29, 2009, 2426 – 2432
7. [7] John R. Thome and GherhardtRibatski, State-of-the-art of two-phase flow and flow boiling heat transfer and pressure drop of CO2 in macro- and micro-channels, International Journal of Refrigeration, 28, 2005, 1149 – 1168
8. [8] MaximeDucoulombier, StéphaneColasson, Jocelyn Bonjour, Philippe Haberschill, Carbon dioxide flow boiling in a single microchannel – Part I: Pressure drops, Experimental Thermal and Fluid Science, 35, 2011, 581 – 596

9. [9] Lixin Cheng, GherhardtRibatski, Jesús Moreno Quibén, John R. Thome, New prediction methods for CO2 evaporation inside tubes: Part I – A two-phase flow pattern map and a flow pattern based phenomenological model for two-phase flow frictional pressure drops, International Journal of Heat Mass Transfer, 51, 2008, 111-124.
10. [10] Chaobin Dang, NoboriHaraguchi, EijiHihara, Flow boiling heat transfer of carbon dioxide insidea small-sized microfin tube, International Journal of Refrigeration, 33, 2010, 655 – 663.
11. [11] Thanhtrung Dang and Jyh-tong Teng, Comparisons of the heat transfer and pressure drop of the microchannel and minichannel heat exchangers, Heat Mass Transfer, 47, 2011, 1311 – 1322.
12. [12] E.R. Dario, L. Tadrist, J.C. Passos, Review on two-phase flow distribution in parallel channels with macro and micro hydraulic diameters: Main results, analyses, trends, Applied Thermal Engineering, 59, 2013, 316 – 335.
13. [13] Zhao Yu, Orin Hemminger, Liang-Shih Fan, Experiment and lattice Boltzmann simulation of two-phase gas–liquid flows in microchannels, Chemical Engineering Science, 62, 2007, 7172 – 7183
14. [14] Rin Yun, Jae Hyeok. Heo, Yongchan Kim, Evaporative heat transfer and pressure drop of R410A in microchannels, International Journal of Refrigeration, 29, 2006, 92 – 100
15. [15] Manhoe Kim, JosteinPettersen, Clark W. Bullard, Fundamental process and system design issues in CO2 vapor compression systems. Progress in Energy and Combustion Science, 30, 2004, 119 – 174.
16. [16] Liang Yang, Hui Li, Si-weiCai, Liang-liang Shao, Chun-luZang, Minimizing COP loss from optimal high pressure correlation for transcritical CO2 cycle” Applied Thermal Engineering, 89, 2015, 656 – 662.
17. [17] AkliluTesfamichaelBaheta, Suhaimi Hassan, AllyaRadzihan B. Reduan, Abraham D. Woldeyohannes, Performance investigation of transcritical carbon dioxide refrigeration cycle, Procedia CIRP, 26, 2015, 482 – 485.
18. [18] R. Cabello, D. Sa´nchez, R. Llopis, E. Torrella, Experimental evaluation of the energy efficiency of a CO2 refrigerating plant working in transcritical conditions, Applied Thermal Engineering, 28, 2008, 1596 – 1604.
19. [19] Rin Yun, Yongchan Kim, Chasik Park, Numerical analysis on a microchannel evaporator designed for CO2 air-conditioning systems, Applied Thermal Engineering, 27, 2007, 1320 – 1326.
20. [20] Y.T. Ge , S.A. Tassou, I. DewaSantosa, K. Tsamos, Design Optimisation of CO2Subcooler/Condenser in a Refrigeration System, Energy Procedia,61, 2014, 2311 – 2314.
21. [21] Jifeng Jin, Jiangping Chen, Zhijiu Chen, Development and validation of a microchannel evaporator model for a CO2 air-conditioning system, Applied Thermal Engineering, 31, 2011, 137 – 146.
22. [22] Man-Hoe Kim, Clark W. Bullard, Development of a microchannel evaporator model for a CO2 air-conditioning system, Energy, 26, 2001, 931 – 948.
23. [23] Paul Maina and Zongjie Huan, Effects of Various Parameters on the Efficiency of a CO2 Heat Pump: A Statistical Approach, Journal of Thermal Engineering, Vol. 1, Issue 4, 2015, pp. 236-278
24. [24] Chi-Chuan Wang, Chen-Xi Zhu, and Yi-Chun Tang, Performance and Flow Distribution of the Plate Heat Exchanger with Supercritical Fluid of Carbon Dioxide, Journal of Thermal Engineering, Vol. 1, Issue 3, 2015, pp. 143-151.
25. [25] Tankhuong Nguyen, Tronghieu Nguyen, Thanhtrung Dang, and Minhhung Doan, An experiment on a CO2 air conditioning system with Copper heat exchangers, International Journal of Advanced Engineering, Management and Science, Vol. 2, 2016, 2058-2063.
26. [26] http://www.daikin.com.vn/en/products/residential/split/ftkv/index.html
27. [27]http://www.tranevietnam.com/en/Products/Dx-Unitary-System/Residental-Split-Air-Conditioners/Premio-New-High-Wall-Type-Air-Conditioner/
28. [28] Young Chul Kwon, DaeHoon Kim, Jae Heon Lee, Jun Young Choi and Sang Jae Lee, Experimental study on heat transfer characteristics of internal heat exchangers for CO2 system under cooling condition, Journal of Mechanical Science and Technology Vol. 23, 2009, 698 – 706.
29. [29] Jae Seung Lee, Mo Se Kim, and Min Soo Kim, Studies on the performance of a CO2 air conditioning system using an ejector as an expansion device, International Journal of Refrigeration, Vol. 38, 2014, pp. 140-152.