Authors

Exergy analysis of a vapor compression refrigeration unit under variable operating conditions

DOI: 10.17586/1606-4313-2024-23-4-25-31
UDC 621.56

Exergy analysis of a vapor compression refrigeration unit under variable operating conditions

Aleksandr A. Malyshev, Olga S. Malinina, Ignatiev Vitaly E.

For citation: Malyshev A.A., Malinina O.S., Ignatiev V.E. . Exergy analysis of a vapor compression refrigeration unit under variable operating conditions. Journal of International Academy of Refrigeration. 2024. No 4. p. 25-31. DOI: 10.17586/1606-4313-2024-23-4-25-31

Abstract
An exergy analysis of a vapor compression refrigeration unit was performed under changing climatic and system parameters. The analysis was carried out for the climatic conditions of the North-Western region of Russia. The relationships between exergy efficiency were established both for the individual elements and the entire system. The influence of changes in boiling temperature on the efficiency of the refrigeration unit was revealed. It was established that a change in boiling temperature from –13 to –7 оС leads to a change in the exergy efficiency of the system by 10%. An increase in evaporator efficiency is observed as the ambient temperature increases. Exergy efficiency was determined for the compressor, condenser, evaporator, and the unit as a whole. The results obtained can be used for further analysis of refrigeration units to increase their efficiency.

Keywords: refrigeration unit, exergy analysis, boiling point, condensation temperature, exergy efficiency.

All references

1. Kazakov V.G., Lukanin P.V., Smirnova O.S. Exergetic methods for assessing the efficiency of thermal technology installations: a textbook. St. Petersburg, 2013. 93 p.

2. Talyzin M.S. Methods for analyzing the energy efficiency of refrigeration units. Refrigeration equipment. 2021 vol. 110, No. 1 P. 23-30.

3. Tsvetkov O.B. Refrigerants. St. Petersburg: SPbGUNIPT, 2003. 216 p.

4. Brodyansky V.M. Exergetic method of thermodynamic analysis. Moscow, Energy, 1973. 296 p.

5. Zykov S.V. Exergetic method of load distribution at thermal power plants. Science. Technologies. Innovations: materials of Vseros. scientific conf. young scientists, November 28-30, 2012: at 6 o’clock – Novosibirsk: NSTU Publishing House, 2012. Part 2. pp. 154-158.

6. Malyshev A.A., Ryabova T.V. Fundamentals of World Energy: Textbook. St. Petersburg: ITMO University, 2022. 201 pp.

7. Ahamed J.U., Saidur R., Masjuki H.H.A review on exergy analysis of vapor compression refrigeration system.Renewable and Sustainable Energy Reviews, Vol. 15, p. 1593-1600.

8. Moran J.M., Shapiro N.H. Principles of Engineering Thermodynamics, 6nd ed., LTC Ed., São Paulo, Brazil. 2009.

9. Seyam S. Types of HVAC Systems. HVAC Syst. Rijeka: IntechOpen; 2018. DOI:10.5772/intechopen.78942

10. Dincer I, Rosen MA. Exergy: Energy, Environment and Sustainable Development. 2nd ed. Elsevier; 2013.

11. Mehrpooya M., Ansarinasab H. Advanced exergoeconomic analysis of the multistage mixed refrigerant systems. Energy Conversion and Management. 2015; 103: 705-716. DOI:10.1016/j.enconman.2015.07.026

12. Hosseini M., Dincer I., Rosen M.A. Hybrid solar-fuel cell combined heat and power systems for residential applications: Energy and exergy analyses. Journal of Power Sources. 2013;221:372-380. DOI:10.1016/j.jpowsour.2012.08.047

13. Amir V., Aminreza N., Mohammad G and Sadegh V. Exergy Concept and its Characteristic. International journal of Multidisciplinary Sciences and Engineering, July 2011, Vol. 2, No. 4.

14. Ust, Y., Akkaya A.V. and Safa A. Analysis of a vapour compression refrigeration system via exergetic performance coefficient criterion. Journal of the Energy Institute, 2011.