Increasing the efficiency of a vapour compression refrigerating machine through adiabatic air cooling
DOI:
https://doi.org/10.24425/ather.2025.154195Abstract
The issue of reducing energy consumption and the negative impact on the environment caused by vapour-compression refrigerating machines through the use of adiabatic air cooling technologies is considered in the paper. The climatic features of the use of adiabatic air cooling are determined using the example of four cities of Ukraine (Lviv, Kyiv, Kharkiv, Odesa). It is shown that the maximum cooling effect is observed in Kharkiv, although in terms of maximum temperatures and the duration of the warm period, this city is 6.3% inferior to Odesa. However, due to low relative humidity, the cooling efficiency was 5.4% higher. To conduct a comparative study of the effectiveness of the use of adiabatic technologies, field tests were conducted on two identical refrigerating units working under the same operating conditions, one of which was additionally equipped with an evaporative cooling system. A monitoring system, which was installed on both the original and the modernized refrigerating units, was developed to collect, accumulate and pre-process experimental data. It was determined that when using adiabatic technologies, the mass flow rate of the refrigerant is reduced compared to the original vapour-compression machine while ensuring the same cooling capacity, which in turn leads to a decrease in the load on the compressor. In turn, this leads to a decrease in the rotation frequency of the compressor electric motor, which resulted in a decrease in energy consumption by 25–28 % for the considered type of refrigerating units.References
[1] Kuznetsov, M., Tarasova, V., & Kostikov, A. (2025). Technoeconomic method for the rational choice of air source heat pumps for bivalent heating systems. In Advances in Mechanical and Power Engineering II (pp. 153–163). Springer. https://doi.org/10.1007/978-3-031-82979-6_16
[2] Kharlampidi, D., Kuznetsov, M., Tarasova, V., & Voytenko, E. (2017). Thermodynamic analysis of air-compression refrigerating machine based on exergy cost theory. Eastern-European Journal of Enterprise Technologies, 5(8), 30–38. https://doi.org/10.15587/1729-4061.2017.112113
[3] Kharlampidi, D., Tarasova, V., Kuznetsov, M., & Omelichkin, S. (2016). Application of C-curves for optimization of supercritical cycles. Eastern-European Journal of Enterprise Technologies, 5(8), 20–25. https://doi.org/10.15587/1729-4061.2016.79988
[4] Kuznetsov, M., Kharlampidi, D., Tarasova, V., & Voytenko, E. (2016). Thermoeconomic optimization of CO2 refrigeration system. Eastern-European Journal of Enterprise Technologies, 6(8), 24–32. https://doi.org/10.15587/1729-4061.2016.85397
[5] Sutandi, T., Margana, A.S., Sumeru, K., & Sukri, M.F. (2020). Experimental study of R32 as retrofit refrigerant. Advances in Engineering Research, 198, 167–170. https://doi.org/10.2991/aer.k.201221.029
[6] Zhao, D., Zhao, R., Deng, S., Zhao, L., & Chen, M. (2020). Transcritical CO2 power cycle for waste heat recovery. Energy Conversion and Management, 226, 113578. https://doi.org/10.1016/j.enconman.2020.113578
[7] Sánchez, D., Aranguren, P., Casi, A., Llopis, R., Cabello, R., & Astrain, D. (2020). Experimental enhancement of CO2 transcritical refrigeration plant. International Journal of Refrigeration, 120, 178–187. https://doi.org/10.1016/j.ijrefrig.2020.08.031
[8] Estrada, A., Córdova-Castillo, L., & Piedra, S. (2024). Enhancing vapor compression refrigeration efficiency via control. Processes, 12(8), 1600. https://doi.org/10.3390/pr12081600
[9] Khatri, R., & Joshi, A. (2017). Energy performance comparison of inverter-based AC systems. Energy Procedia, 109, 18–26. https://doi.org/10.1016/j.egypro.2017.03.038
[10] Wu, J.M., Huang, X., & Zhang, H. (2009). Heat and mass transfer in direct evaporative cooler. Applied Thermal Engineering, 29(5–6), 980–984. https://doi.org/10.1016/j.applthermaleng.2008.05.016
[11] Fouda, A., & Melikyan, Z. (2011). Simplified model of evaporative cooler. Applied Thermal Engineering, 31(5), 932–936. https://doi.org/10.1016/j.applthermaleng.2010.11.016
[12] Evapco. (2018). Adiabatic fluid coolers & refrigerant condensers: Impact of pad system design. http://www.evapco.com/sites/evapco.com/files/2019-02/Adiabatic-Pad-Saturation-White-Paper-11.2018.pdf [accessed 28 Apr. 2025].
[13] Riangvilaikul, B., & Kumar, S. (2010). Numerical study of dew point evaporative cooling system. Energy and Buildings, 42(11), 2241–2250. https://doi.org/10.1016/j.enbuild.2010.07.020
[14] Bilal, S.A., & Alansari, A.A. (2021). Efficiency and energy savings of adiabatic pre-cooling system. International Journal of Scientific & Technology Research, 10(4), 86–90.
[15] Kuznetsov, M.O., Kharlampidi, D.Kh., & Tarasova, V.O. (2017). Influence of air humidity on thermoeconomic indicators of air conditioners. Conference Proceedings. https://card-file.ontu.edu.ua/handle/123456789/8571
[16] Kuznetsov, M.O., Tarasova, V.O., & Kostikov, A.O. (2022). Influence of airflow humidity on CO2 air conditioners. Scientific Results 2022 Conference.
[17] Kim, J.W., Yang, W., & Moon, H.-J. (2017). Integrated comfort control with cooling and ventilation systems. Science and Technology for the Built Environment, 23(2), 264–276. https://doi.org/10.1080/23744731.2016.1258294
[18] Song, Y., & Cao, F. (2018). Optimal medium temperature in CO2 heat pump system. Energy Conversion and Management, 166, 409–423. https://doi.org/10.1016/j.enconman.2018.04.052
[19] Oxycom. (2025). All there is to know about evaporative cooling. https://www.oxy-com.com/evaporative-cooling [accessed 28 Apr. 2025].
[20] Matsevityy, Yu.M., Bratuta, E.G., Kharlampidi, D.Kh., & Tarasova, V.A. (2014). System-structural analysis of steam compressor thermotransformers. IPMach of NASU. https://repository.kpi.kharkov.ua/handle/KhPI-Press/18163
[21] Antonius, J., & Reinders, M. (2005). Heat exchange element. WO Patent 2005019739 A1.
