Exergetic Investigation of a R1234yf Automotive Air Conditioning System with Internal Heat Exchanger

Abstract

This study presents the exergetic investigation of an automotive air conditioning (AAC) system with the refrigerant R1234yf experimentally. The air-conditioning system is based on the conventional mechanical compression refrigeration cycle. An internal heat exchanger (IHX) has been added to the system in order to provide performance enhancement. The influence of the IHX investigated at different compressor speeds and air stream temperatures. Experimental measurements were collected by using a data-acquisition system, and the results were obtained by performing exergetic analysis. The exergy destruction, exergy efficiency and the total exergy destruction per cooling capacity were calculated. The analysis results were compared with a baseline system which operates with the refrigerant R134a. Furthermore, an empirical correlation was proposed for the determination of the total exergy destruction per cooling capacity for various compressor speeds for evaluating the system performance without doing further experiments. As a result, the exergetic efficiency of the system was improved by introducing IHX to the system. Moreover, it was observed that the temperature rise in the air stream decreased the exergy efficiency and increased the total exergy destruction per cooling capacity. 

Keywords

• Automobile air conditioning; exergy analysis; internal heat exchanger; R1234yf.

References

1. [1] R. Akasaka, K. Tanaka, Y. Higashi, “Thermodynamic Property Modelling for 2,3,3,3-tetrafluoropropene (HFO-1234yf),” International Journal of Refrigeration, 33, 52-60, 2010.
2. [2] European Parliament and of the Council Official Journal of the European Union, “Emissions from Air Conditioning Systems in Motor Vehicles,” Directive No.2006/40/EC, EU, Brussels, 2006.
3. [3] European Parliament and of the Council, Regulation Official Journal of the European Union, “Fluorinated greenhouse gases,” Directive No.2014/517/EU, EU, Strasbourg, 2014.
4. [4] M. Spatz, and B. Minor, “HFO-1234yf Low-GWP Refrigerant Update,” in Proceedings of the International Refrigeration and Air Conditioning Conference, West Lafayette, Indiana, pp. 1-8, 2008.
5. [5] M. O. McLinden, A. F. Kazakov, J. S. Brown, P. A. Domanski, “A Thermodynamic Analysis of Refrigerants: Possibilities and Tradeoffs for Low-GWP Refrigerants,” International Journal of Refrigeration, 38, 80-92, 2014.
6. [6] C. Zilio, J. S. Brown, G. Schiochet, A. Cavallini, “The Refrigerant R1234yf in Air Conditioning Systems,” Energy, 36, 6110-6120, 2011.
7. [7] S. Petitjean, and J. Benouali, “R-1234yf Validation & A/C System Energy Efficiency Improvements,” in Proceedings of the SAE Alternate Refrigerant Symposium, Scottsdale, Arizona, 2010.
8. [8] Y. Lee, D. Jung, “A Brief Performance Comparison of R1234yf and R134a in a Bench Tester for Automobile Applications,” Applied Thermal Engineering, 35, 240-242, 2012.

9. [9] J. Navarro-Esbri, J. M. Mendoza-Miranda, A. Mota-Babiloni, A. Barragan-Cervera, J. M. Belman-Flores, “Experimental Analysis of R1234yf as a Drop-in Replacement for R134a in a Vapor Compression System,” International Journal of Refrigeration, 36, 870-880, 2013.
10. [10] D. Sanchez, R. Cabello, R. Llopis, I. Aruzaro, J. Catalan Gil, E. Torrella, “Energy Performance Evaluation of R1234yf, R1234ze(E), R600a, R290, and R152a as Low-GWP R134a Alternatives,” International Journal of Refrigeration, 74, 269-282, 2017.
11. [11] H. S. Hamut, I. Dincer, G. F. Naterer, “Exergetic and Energetic Evaluations of Hybrid Electric Vehicle Thermal Management Systems,” International Journal of Exergy, 12, 341-363, 2014.
12. [12] J. Navarro-Esbri, F. Moles, A. Barragan-Cervera, “Experimental Analysis of the Internal Heat Exchanger Influence on a Vapour Compression System Performance Working with R1234yf as a Drop-in Replacement for R134a,” Applied Thermal Engineering, 59, 153-161, 2013.
13. [13] H. Cho, H. Lee, C. Park, “Performance Characteristics of an Automobile Air Conditioning System with Internal Heat Exchanger Using Refrigerant R1234yf,” Applied Thermal Engineering, 61, 563-569, 2013.
14. [14] G. Pottker, P. S. Hrnjak, “Experimental Investigation of the Effect of Condenser Subcooling in R134a and R1234yf Air Conditioning Systems with and without Internal Heat Exchanger,” International Journal of Refrigeration, 50, 104-113, 2015.
15. [15] T. Morosuk, G. Tsatsaronis, “Advanced Exergetic Evaluation of Refrigeration Machines Using Different Working Fluids,” Energy, 34, 2248-2258, 2009.
16. [16] A. Yataganbaba, A. Kilicarslan, I. Kurtbas, “Irreversibility Analysis of a Two-Evaporator Vapor Compression Refrigeration System,” International Journal of Exergy, 18, 340-355, 2015.
17. [17] A. G. Devecioglu, V. Oruc, “The Influence of Plate-Type Heat Exchanger on Energy Efficiency and Environmental Effects of the Air-Conditioners Using R453A as a Substitute for R22,” Applied Thermal Engineering, 112, 1364-1372, 2017.
18. [18] E. B. Ratts, J. S. Brown, “Experimental Analysis of Cycling in an Automotive Air Conditioning System,” Applied Thermal Engineering, 20, 1039-1058, 2000.
19. [19] A. Yataganbaba, A. Kilicarslan, I. Kurtbas, “Exergy Analysis of R1234yf and R1234ze as R134a Replacements in a Two Evaporator Vapour Compression Refrigeration System,” International Journal of Refrigeration, 60, 26-37, 2015.
20. [20] S. Golzari, A. Kasaeian, S. Daviran, O. Mahian, S. Wongwises, A. Z. Sahin, “Second Law Analysis of an Automotive Air Conditioning System Using HFO-1234yf, an Environmentally Friendly Refrigerant,” International Journal of Refrigeration, 73, 134-143, 2017.
21. [21] M. Suhermanto, M. Hosoz, M. C. Aral, “Effect of Ambient Temperature on the Performance Characteristics of Automotive Air Conditioning System Using R1234yf and R134a: Energy and Exergy-based approaches,” in Proceedings of the Mechanical Engineering and Engineering Education Conference, Malang, pp. 1-8, 2016.
22. [22] H. Cho, C. Park, “Experimental Investigation of Performance and Exergy Analysis of Automotive Air Conditioning Systems Using Refrigerant R1234yf at Various Compressor Speeds,” Applied Thermal Engineering, 101, 30-37, 2016.
23. [23] M. Direk, A. Kelesoglu, A. Akin, “Drop-in Performance Analysis and Effect of IHX for an Automotive Air Conditioning System with R1234yf as a Replacement of R134a,” Strojniški vestnik - Journal of Mechanical Engineering, 63, 314-319, 2017.
24. [24] Q. Zhaogang, “Quick and Empirical Correlations for Refrigerant Pressure Drop in Mobile Air Conditioning System Evaporators,” International Journal of Refrigeration, 55, 30-36, 2015.
25. [25] M. C. Aral, M. Hosoz, M. Suhermanto, “Empirical Correlations for the Performance of an Automotive Air Conditioning System Using R1234yf and R134a,” Journal of Thermal Sciences and Technology, 37, 127-137, 2017.
26. [26] M. S. Mert, Ö. F. Dilmac, S. Ozkan, F. Karaca E. Bolat, “Exergoeconomic Analysis of a Cogeneration Plant in an Iron and Steel Factory,” Energy, 46, 78-84, 2012.
27. [27] W. F. Stoecker, J. W. Jones, Refrigeration and Air Co