ENERGY AND EXERGY ANALYSIS OF A DOMESTIC REFRIGERATOR: APPROACHING A SUSTAINABLE REFRIGERATOR

Abstract

In the perspective of reducing the household energy consumption, current research in conventional refrigeration is concentrating on introducing innovative designs and enhances the energy efficiency of the refrigeration system. This research work compares the performance of the domestic refrigerator by employing hot-wall air cooled and box type shell and tube water-cooled condenser. The energy and exergy analysis methods help to localize exergy losses in the refrigerator. The investigation is carried out according to ISO 15502:2005. Experimental studies were conducted in the same refrigerator unit operating with a different condenser to determine the coefficient of performance, exergy efficiency, and exergy loss in all components of the domestic refrigerator. The experimental result shows that COP is increased by 18-20% and the exergy efficiency of the refrigerator with water cooled condenser unit is found to be higher by 6.89-9.13% than the one with a hot-wall air cooled condenser. The per day energy consumption of a refrigerator with a water-cooled condenser reduces by 17% in comparison with conventional refrigerator. The irreversibility of the refrigerator with the water-cooled condenser is reduced by 34 % than that of the conventional system under similar operating conditions.  The total equivalent warming impact of refrigerator working with the water-cooled condenser is 16% lower than that the refrigerator with air cooled condenser. The utilization of water-cooled condenser in household refrigerators enhances energy efficiency.

Keywords

• Refrigerator,Water cooled Condenser,Hot wall Condenser,Energy,Exergy

References

1. [1] Geppert, J., and Stamminger, R. (2013). Analysis of effecting factors on domestic Refrigerator’s energy consumption in use, Energy Conversion and Management, 76, 794-800.
2. [2] Aprea, C., Greco A. and Maiorino, A. V (2012). An experimental evaluation of the greenhouse effect in the substitution of R134a with CO2, Energy, 45 (1), 753-761.
3. [3] Raveendran, P. Saji, and Sekhar, S. Joseph, (2016). Experimental studies on domestic refrigeration system with a brazed plate heat exchanger as condenser, Journal of Mechanical Science and Technology, 30 (6), 2865-2871.
4. [4] Palm, B., (2007). Refrigeration systems with a minimum charge of refrigerant, Applied Thermal Engineering, 27, 1693-1701.
5. [5] Sonnenrein G, Elsner A, Baumhogger E, Morbach A, Fieback K, Vrabec J(2015). Reducing the power consumption of household refrigerators through the integration of latent heat storage elements in wire-and tube condensers, International Journal of Refrigeration; 51:154–60.
6. [6] Zhang Z, Huang D, Zhao R, Leng Y. (2017). Effect of airflow field optimization around spiral wire-on-tube condenser on a frost-free refrigerator performance. Applied Thermal Engineering; 114:785–92.
7. [7] Ameen, A., Seetharamu, K.N., Mollik, S.A., Mahmud, Khizir, Quadir, G. A (2006). Numerical analysis and experimental investigation into the performance of a wire-on-tube condenser of a retrofitted refrigerator, International Journal of Refrigeration, 29,495–504.
8. [8] Shikalgar N. D., and Sapali, S. N., (2017). Numerical and Thermal Analysis of Condensers applied to domestic Refrigerator, Journal of International Review of Mechanical Engineering, Vol. 11 N7, PP 81- 84.

9. [9] Bansal, P. K., (2003). Developing new test procedures for domestic refrigerators: harmonization issues and future R&D needs—a review, International Journal of Refrigeration,26,735–748.
10. [10] Hosoz M., and Kilicarslan, A, (2004). Performance evaluations of refrigeration systems with air-cooled, water-cooled and evaporative condensers, International Journal of Energy Research, 28, 683-696.
11. [11] Hesselgreaves, J. E., The impact of compact heat exchangers on refrigeration technology and CFC replacement, International Refrigeration and Air Conditioning Conference, 135-139, 1990.
12. [12] Li, Y., Wu J., and Shoichi, S., (2009). Modelling and energy simulation of the variable refrigerant flow air conditioning system with a water-cooled condenser under cooling conditions, Energy and Buildings, 41, 949-957.
13. [13] ASHRAE Handbook, (2008). HVAC Systems and Equipment, ASHRAE
14. [14] Ramezanizadeh, M., et al., (2019). Experimental and Numerical Analysis of a Nanofluidic Thermosyphon Heat Exchanger, Engineering Applications of Computational Fluid Mechanics 13 (1): 40-47.
15. [15] Aprea C, Greco A. (2002). An exergetic analysis of R22 substitution Applied Thermal Eng.; 22:1455–69.
16. [16] Saravanakumar, R., and Selladurai, V.(2013). Exergy analysis of a domestic refrigerator using eco-friendly R290/R600a refrigerant mixture as an alternative to R134a, Journal of Thermal Analysis and Calorimetry, 115,933-940.
17. [17] S. Joseph Sekhar, Raveendran, P. Saji (2017).Exergy analysis of a domestic refrigerator with a brazed plate heat exchanger as condenser, Journal of Thermal Calorimetry, 127:2439–2446.
18. [18] Raveendran, P. Saji, Sekhar, S. Joseph, (2017). Performance studies on domestic refrigerators retrofitted with building-integrated water-cooled condenser, Energy and Buildings,134, 1–10.
19. [19] Mahmood Mastani Joybari, Mohammad Sadegh Hatamipour, Amir Rahimi, Fatemeh Ghadiri Modarres (2013). Exergy analysis and optimization of R600a as a replacement of R134a in a domestic refrigerator international journal of Refrigeration, 36,1233-1242.
20. [20] Hosseinzadeh-Bandbafha, H. (2018). Application of data envelopment analysis approach for optimization of energy use and reduction of greenhouse gas emission in peanut production of Iran, Journal of Cleaner Production 172: 1327-1335.
21. [21] Pavel Makhnatcha, Rahmatollah Khodabandeha(2014). The role of environmental metrics (GWP, TEWI, LCCP) in the selection of low GWP refrigerant, The 6th International Conference on Applied Energy – ICAE2014, Energy Procedia 61, 2460 – 2463.
22. [22] Ahamed, J.U., R. Saidur, H.H. Masjuki (2011). A review on exergy analysis of vapour compression refrigeration system, International Journal of Renewable and Sustainable Energy Reviews, 15, 1593–1600.
23. [23] Davies, Thomas W., and Caretta, Ottone,(2004). A low carbon, low TEWI refrigeration system design, Applied Thermal Engineering, 24, 1119–1128.
24. [24] Coleman, H.W. and Steele, W.G., (1999). Experimentation and Uncertainty Analysis for Engineers, 2nd Edition, John Wiley & Sons, Inc., New York, NY.
25. [25] ISO 15502: 2005, Household refrigerating appliances.