Methodology for determining of the main characteristics of a refrigeration system with condensation heat removal by radiative cooling

To reduce the condensation pressure of the refrigerant in the summer, refrigeration system has been developed, in which, during periods of high air temperature, the heat of condensation is removed to the coolant, which was pre-cooled at night due to radiative cooling. A methodology has been developed for determining the main characteristics of the elements of the proposed system and calculating its daily energy consumption. The calculation shows that the proposed system with a nominal refrigerating capacity of 10 kW, using the R404a refrigerant, allows in the climate of the city of Shymkent to reduce the condensation temperature to +32.9°C, and daily energy consumption by 6.5% compared to an ordinary vapor compression refrigeration machine.

1. Birangane V.V., Patil A.M Comparison of Air Cooled and Evaporatively Cooled Refrigerartion Systems – A Review Paper., // J. Eng. Res. Appl. – 2014. – Vol. 4, № 6. – P. 208-211.

2. Demin A.P., Vodnye resursy i prodo-vol'stvennaja bezopasnost': partnerstvo Rossii i stran Azii / // Vodnoe hozjajstvo Rossii. – 2017. – № 3. – S. 40-54. (in Russian)

3. Gerlitz, L., Vorogushyn S., Gafurov A Climate informed seasonal forecast of water availability in Central Asia: State-of-the-art and decision making context // Water Secur. – 2020. – Vol. 10. – 100061. – DOI: 10.1016/j.wasec.2020.100061.

4. Zhupankhan A, Tussupova K,. Berndtsson R Water in Kazakhstan, a key in Central Asian water management // Hydrol. Sci. J. – 2018. – Vol. 63, № 5. – P. 752-762. – DOI: 10.1080/02626667.2018.1447111.

5. Zhao, D. Radiative sky cooling: Fundamental principles, materials, and applications / D. Zhao, A. Aili, Sh. Xu, G. Tan, X. Yin, R. Yang // Appl. Phys. Rev. – 2019. – Vol. 6, № 2. – 021306. – DOI: 10.1063/1.5087281.

6. Goldstein E.A., Raman A. P., Fan S Sub-ambient non-evaporative fluid cooling with the sky. // Nat. Energy. – 2017. – Vol. 2. – 17143. – DOI: 10.1038/nenergy.2017.143.

7. Пат. WO 2006/054897 A1, МПК F25B 23/00, F25B 25/00. Refrigeration or cooling system / S. M. van der Sluis,. Oostendorp P. A, Hendriksen L. J. A. M. – заявл. 22.11.2004, опубл. 26.05.2006.

8. NTP APK 1.10.12.001-02. Normy tehno-logicheskogo proektirovanija predprijatij po hraneniju i obrabotke kartofelja i plodoovoshh-noj produkcii. – Moskva: FGUP “Gipro-nisel'prom”, 2002. – 154 s. (in Russian)

9. Tsoy A.P, Granovsky A.S., Tsoy D.A. Modelling of the operation of a refrigeration unit using radiative cooling to maintain the storage temperature in the cold room // MATEC Web Conf. – 2020. – Vol. 324. – 02006. –DOI: 10.1051/matecconf/202032402006.

10. Tsoi A.P., Granovskii A.S., Tsoi D.A. Issledovanie raboty kholodil'noi ustanovki nochnogo radiatsionnogo okhlazhdeniya v usloviyakh rezko-kontinental'nogo klimata // VII mezhdunarodnaya nauchno-tekhnicheskaya konferentsiya «Nizkotempera-turnye i pishchevye tekhnologii v XXI vekE» (Sankt-Peterburg, 17–20 noyabrya 2015 goda). CH.1: Materialy konferentsii. – SPb.: Universitet ITMO, 2015. – S. 99-101. (in Russian)

11. Samuel D.G.L. Passive alternatives to mechanical air conditioning of building: A review /. Nagendra S. M. S, Maiya M. P. // Build. Environ. – 2013. – Vol. 66 – P. 54-64. – DOI: 10.1016/j.buildenv.2013.04.016.

12. Tsoi A.P., Granovskii A.S. Raschet velichiny ehffektivnoi kholodoproizvoditel'nosti kholodil'noi sistemy, ispol'zuyushchei okhlazh-dayushchii ehffekt nebosvoda // Vestnik Mezhdunarodnoi Akademii Kholoda. – 2014. – № 3. – S. 35-40. (in Russian)