Aerospace Technic and Technology

Modern heat-using ejector refrigeration machines used in heat recovery systems for power plants based on gas turbine engines and internal combustion engines have many advantages over absorption refrigeration machines: smaller dimensions and weight; the ability to obtain lower temperatures. However, they are inferior in energy efficiency, and the thermal coefficient is much lower and can be 0.2…0.4. The efficiency of such refrigeration machines largely depends on the choice of the working fluid (refrigerant). Hence the need to choose a refrigerant that would provide the maximum heat factor, and hence the maximum efficiency of heat recovery. Given the relatively low efficiency of the ejector refrigeration machine, the search for a working fluid that will provide, on the one hand, higher thermal coefficients, and on the other hand high environmental friendliness, is one of the promising areas of development of heat recovery technologies in power plants. The study used the software complex developed by the authors to calculate the refrigeration cycles of heat-using refrigeration machines, taking into account the properties of many modern refrigerants, ejector characteristics, as well as basic heat exchangers (condenser, evaporator, generator). The efficiency of ejector refrigeration machines when working on the following working bodies was analyzed: R142b, R134a, R600, R600a, R1234ze(E), R1233zd(E), R1234yf, R227ea, R236fa, R245fa. R142b, R600, R600a, R245fa have the largest values of thermal coefficients. It is established that the most profitable in terms of environmental friendliness (ODP, GWP) and energy efficiency is the use of refrigerant R245fa, which has a condensation temperature range is 25…35 ^oC and boiling in the evaporator is 0…15 ^oC thermal coefficient is 0.40…1.03.

ejector; refrigerator; heat recovery; trigeneration; low-boiling working fluid

Radchenko, A., Scurtu, I-C., Radchenko, M., Forduy, S., Zubarev, A. Monitoring the efficiency of cooling air at the inlet of gas engine in integrated energy system. Thermal Science, 2020. DOI: 10.2298/TSCI200711344R.

Radchenko, A., Mikielewicz, D., Forduy, S., Radchenko, M., Zubarev, A. Monitoring the Fuel Efficiency of Gas Engine in Integrated Energy System. Integrated Computer Technologies in Mechanical Engineering (ICTM 2019). AISC, 2020, vol. 1113, pp. 361-370. Doi: 10.1007/978-3-030-37618-5_31.

Trushliakov, E., Radchenko, A., Forduy, S., Zubarev, A., Hrych, A. Increasing the Operation Efficiency of Air Conditioning System for Integrated Power Plant on the Base of Its Monitoring. Integrated Computer Technologies in Mechanical Engineering. AISC, 2020, vol. 1113, pp. 351-360. DOI: 10.1007/978-3-030-37618-5_30.

Konovalov, D., Kobalava, H. Efficiency Anal-ysis of Gas Turbine Plant Cycles with Water Injection by the Aerothermopressor. Advances in Design, Simulation and Manufacturing II. DSMIE 2019. LNME, Springer, Cham, 2019, pp. 581-591.

Kornienko, V., Radchenko, R., Mikielewicz, D., Pyrysunko, M., Andreev, A.: Improvement of Characteristics of Water-Fuel Rotary Cup Atomizer in a Boiler. Advanced Manufacturing Processes II. InterPartner 2020. LNME, 2021, pp. 664-674. DOI: 10.1007/978-3-030-68014-5_64.

Radchenko, M., Mikielewicz, D., Andreev, A., Vanyeyev, S., Savenkov O. Efficient ship engine cyclic air cooling by turboexpander chiller for tropical climatic conditions. Integrated Computer Technologies in Mechanical Engineering, LNNS, 2021, vol. 188, pp. 498-507. DOI: 10.1007/978-3-030-66717-7_42.

Radchenko, A., Trushliakov, E., Kosowski, K., Mikielewicz, D., Radchenko M. Innovative turbine intake air cooling systems and their rational designing. Energies, 2020, vol. 13, no. 23. Articles Id: 6201. DOI: 10.3390/en13236201.

Konovalov, D., Kobalava, H., Radchenko, M., Sviridov, V., Scurtu, I.C. Optimal Sizing of the Evaporation Chamber in the Low-Flow Aerothermopressor for a Combustion Engine. Advanced Manufacturing Processes II. InterPartner 2020. LNME, 2021, pp. 654-663. DOI: 10.1007/978-3-030-68014-5_63.

Radchenko, A.M., Portnoi, B.S., Kantor, S.A., Priadko, O.I. Kalinichenko, I.V. Pidvyshchennya efektyvnosti okholodzhennya povitrya na vkhodi HTD kholodyl'nymy mashynamy shlyakhom akumulyatsiyi kholodu [Increasing the efficiency of the air cooling at the gte inlet by chillers with accumulation of cold]. Aviacijno-kosmicna tehnika i tehnologia – Aerospace technic and technology, 2020, no. 4(164), pp. 22-27, DOI: 10.32620/aktt.2020.4.03.

Radchenko, N., Trushliakov, E., Radchenko, A., Tsoy, A., Shchesiuk, O. Methods to determine a design cooling capacity of ambient air conditioning systems in climatic conditions of Ukraine and Kazakhstan. AIP Conference Proceedings 2285, 030074, 2020. DOI: 10.1063/5.0026790.

Elbel, S., Lawrence, N. Review of recent developments in advanced ejector technology. International Journal of Refrigeration, 2016, vol. 62, pp. 1-18.

Lawrence, N., Elbel, S. Experimental investigation of a two-phase ejector cycle suitable for use with low-pressure refrigerants R134a and R1234yf. International Journal of Refrigeration, 2014, vol. 38, pp. 310-322.

Elbel, S. Historical and present developments of ejector refrigeration systems with emphasis on transcritical carbon dioxide airconditioning. International Journal of Refrigeration, 2011, no. 34(7), pp. 1545-1561.

Butrymowicz, D., Gagan, J., Śmierciew, K., Łukaszuk, M., Dudar, A., Pawluczuk, A., Łapiński, A., Kuryłowicz, A. Investigations of prototype ejection refrigeration system driven by low grade heat. HTRSE-2018, E3S Web of Conferences 70, 2018. 7 p.

Zhelezny, V. P., Semenyuk, Y. V. Rabochie tela parokompressornyh holodil'nyh mashin: svojstva, analiz, primenenie [Working bodies of steam-compressor refrigerating machines: proper-ties, analysis, application: monograph]. Odessa, Phoenix Publ., 2012. 420 p.