Justification of the Flow Characteristics of the Recuperator for the Thermal Preparation of Machinery and Equipment Units

OBRABOTKAMETALLOV Vol. 22 No. 4 2020 91 EQUIPMENT. INSTRUMENTS Justi fi cation of the Flow Characteristics of the Recuperator for the Thermal Preparation of Machinery and Equipment Units Roman Chernukhin 1, a,* , Aleksey Dolgushin 2, b , Nikolai Kasimov 3, c , Vladimir Ivancivsky 1, d , Dmitry Lobanov 4, e , Sergey Vasiliev 4, i , Nikita Martyushev 5, g 1 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation 2 Novosibirsk State Agrarian University, 160 Dobrolyubov st., Novosibirsk, 630039, Russian Federation 3 Izhevsk State Agricultural Academy, 11 Studencheskaya st., Izhevsk , 426069, Russian Federation 4 I.N. Ulianov Chuvash State University, 15 Moskovsky Prospekt, Cheboksary, 428015, Russian Federation 5 National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russian Federation a https://orcid.org/0000-0003-1324-0161, Chernuxin@corp.nstu.ru, b https://orcid.org/0000-0002-7506-6309, dolgushin078@mail.ru, c https://orcid.org/0000-0001-9009-0836, nikolakas@list.ru , d https://orcid.org/0000-0001-9244-225X , ivancivskij@corp.nstu.ru , e https://orcid.org/0000-0002-4273-5107, lobanovdv@list.ru , f https://orcid.org/0000-0003-3346-7347, vsa_21@mail.ru , g https://orcid.org/0000-0003-0620-9561, martjushev@tpu.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2020 vol. 22 no. 4 pp. 82–93 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2020-22.4-82-93 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 18 September 2020 Revised: 05 October 2020 Accepted: 07 November 2020 Available online: 15 December 2020 Keywords : Simulation modeling Recuperator Thermal processes Thermal preparation Funding This work was fi nancially supported within the framework of the NSTU Research and Development Thematic Plan (project No. TP-PTM-1_20 project). Acknowledgements The studies were performed at the Col- lective use center “Structure, mechani- cal and physical properties of materi- als” NSTU for help in conducting joint research work. ABSTRACT Introduction . Machines and equipment in its composition may contain hydraulic systems to ensure the functioning of the main and auxiliary systems. It is known that a common disadvantage of hydraulic systems and drives is the dependence of the viscosity of the applied fl uids on temperature. A noticeable part of technological machines and equipment is located in unheated or poorly heated industrial premises and a change in the viscosity of working fl uids with a decrease in the ambient temperature can signi fi cantly affect the parameters of technological processes. An important factor in ensuring the stability of the technological processes parameters is the degree of preparation of machines and equipment for operation at low temperatures or in conditions of fl uctuating temperature conditions. In this regard, the question arises of ensuring the required temperature of technical fl uids before turning on machines and equipment, and maintaining the required thermal regime during the operation of its units and assemblies. One way to solve this problem is to use external heat sources. Various heat exchange devices can serve as such sources. In the heat exchange device, the heat carrier is heated, which is then fed into the heat exchange jacket of the machinery and equipment units. Both liquid and gaseous media are used to heat the coolant in the heat exchanger. In the latter case, the heat exchanger is called a recuperator . The ef fi ciency of the recuperator is determined by its design and fl ow characteristics. There are methods for the analytical determination of both the design and fl ow characteristics of the recuperator, but these methods are quite laborious. The use of computer simulation of thermal processes makes it possible to successfully solve the calculation problem, and also signi fi cantly reduces the design time of heat exchangers. The aim of the work is to substantiate the fl ow characteristics of the recuperator for maintaining the thermal regime through computer simulation. The research method is computer simulation of thermal processes, which is implemented using the SolidWorks software package from Dassault Systems and its Flow Simulation application for simulating thermal processes in scienti fi c research and engineering. Results and discussio n. Simulation carried out in stationary and non-stationary modes made it possible to determine the effect of pump performance on the temperature of the coolant at the outlet of the recuperator. It is found that when the heat carrier fl ow rate is more than 20 l/h, its temperature does not reach the required values, despite the fact that the gases leaving the recuperator have a signi fi cant residual temperature. The ef fi ciency of the recuperator is assessed by determining the exergy ef fi ciency. Based on the data obtained, the most preferable are the pump productivity values lying in the range from 4 to 20 l/h. For citation: Chernukhin R.V., Dolgushin A.A., Kasimov N.G., Ivancivsky V.V., Lobanov D.V., Vasiliev S.A., Martyushev N.V. Justi fi cation of the fl ow characteristics of the recuperator for the thermal preparation of machinery and equipment units. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2020, vol. 22, no. 4, pp. 82–93. DOI: 10.17212/1994-6309-2020- 22.4-82-93. (In Russian). ______ * Corresponding author Roman V. Chernukhin , Ph.D. (Engineering), Associate Professor Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Tel.: 8 (383) 346-17-97, e-mail: Chernuxin@corp.nstu.ru