Prefacedoi: 10.1088/1757-899X/826/1/011001pmid: N/A
The 9th International Conference “Refrigeration and Food Technologies in the 21st Century” 13 – 15 November, 2019 in the School of Biotechnology and Cryogenic Systems of ITMO University. The conference has been held biennially since 2001 and has become a significant event for the Russian and European professional community in the last decade. The traditional format of the event is presentations and discussions of scientists and engineers working in the field of low-temperature and food technologies, as well as reports by specialists in the field of innovations in the food industry.The purpose of the conference is to present modern approaches and methods for solving current scientific problems, and to exchange the latest research results obtained by Russian scientists working in higher education institutions, research institutes (including the Russian Academy of Sciences) and leading industry organizations, as well as scientists from universities in Ukraine, Kazakhstan, the Czech Republic and Finland.In 2020, the conference was held under the auspices of the Saint Petersburg Committee of science and higher education and the Ministry of science and higher education of the Russian Federation. The organizing Committee of the conference includes representatives of leading academic organizations and industrial enterprises in Russia, as well as representatives of specialized foreign organizations. The conference sessions were prepared by the staff of the School of Biotechnology and Cryogenic Systems. The information and organizational sponsor of the conference was the International Academy of Refrigeration.Within the framework of eleven sections, reports were presented on a wide range of issues in the following areas: low - temperature equipment and low-grade energy systems; reliability of materials for biotechnological equipment and low-temperature systems; automation of processes and production; cryogenic equipment and technologies of liquefied natural gas; air conditioning and life support systems; heat and cold engineering for the food industry, industrial ecology and technosphere safety, economic and administrative aspects of food quality assurance.The conference was attended by 365 participants, including 125 representatives from 27 institutions of higher education, 16 participants from 7 research institutes (including the Russian Academy of Sciences) and leading sectoral organizations. During the conference, 193 reports were heard: 4 at the plenary session; 189 at the sessions of sections.The conference helped Russian specialists to get acquainted with research works carried out in many regions of the country and abroad. In this collection, the best of the reported works were selected based on the results of the single-blind review. The main criteria for selecting articles were the relevance of the problem, the originality of the results obtained and their reliability.With the kind regards,Chair of the CommitteeIgor V. Baranov
Peer review statementdoi: 10.1088/1757-899X/826/1/011002pmid: N/A
All papers published in this volume of IOP Conference Series: Materials Science and Engineering have been peer reviewed through processes administered by the proceedings Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.
On the issue of calculating the force factors acting on the working bodies of a single rotor screw compressorPronin, V; Zhignovskaia, D; Minikaev, A; Yerezhep, D
doi: 10.1088/1757-899X/826/1/012001pmid: N/A
The subject of research is a single rotor screw compressor. For the proper compressor design, the forces and moments must be calculated. The cutter’s teeth have a circular shape, therefore, the calculation is reduced to the determination of a torque. This power calculation is based on the law of pressure change in closed cavities of a single rotor screw compressor depending on the angle of a screw rotation and the law of change in the horizontal projection area of a cutter’s tooth meshed with a screw, depending on the angle of a cutter rotation. The term “flat closed figure” in our task means the horizontal projection of the disk cutter’s tooth part meshed with a screw, which takes the form of a triangle or trapezoid. The work shows a horizontal projection of the engagement rotor screw with a disk cutter. To determine the torque acting on the central screw, it is necessary to calculate the circumferential forces acting on the screw and the shoulders of the application forces. The calculation method described above allows one with a sufficient degree of accuracy to determine the forces and moments acting on the working bodies of a screw single-rotor compressor, and therefore, to calculate the deformation of the parts of a screw single-rotor compressor.
Geo-ecological assessment of job-related diseases in mono-cities of the Russian FederationZinovyeva, E G; Koptyakova, S V; Balynskaya, N R; Chuprin, V V; Luntsova, A I
doi: 10.1088/1757-899X/826/1/012002pmid: N/A
The relevance of the study is due to the importance of the health state and the quality of life among the population in connection with the adverse influence of a number of factors (environment, emission from large enterprises, food quality, and natural resources).In the list of these factors affecting the health of employees working in industrial enterprises, harmful factors of the working environment are very important, the impact of which under certain conditions leads to high morbidity with temporary disability, to the development of work-related diseases. The results of a study investigating the level of work-related morbidity suggest that the number of employees in hazardous and harmful working conditions at industrial enterprises in Magnitogorsk increased to 42.95%. In 2017, the ratio of workplaces of industrial enterprises that do not meet sanitary and hygienic requirements for noise increased; the same variable (ratio) according to the standards of vibration, microclimate, lighting decreased; no deviations were detected in electromagnetic fields (EMF). Chronic work-related pathology in 2017 more often arose due to imperfection of technological processes (36.65% of cases), imperfection of workplaces (30.0%), structural shortcomings of labor facilities (16.65%) and sanitary facilities (6.65%), labour (working) contact with an infectious agent (10.0%). The results of the study can be used to improve programs at the federal and regional levels to improve the environmental situation.
Study of convective heat transfer in small-diameter channelsGerasyutenko, V V; Sharkov, A V; Korablev, V A; Kayalajnen, A V; Minkin, D A
doi: 10.1088/1757-899X/826/1/012003pmid: N/A
This paper investigates the convective heat transfer in a tube made of stainless steel 12X18H9T with outer diameter of 2 mm and inner diameter of 1.5 mm. For the research an experimental setup has been designed and assembled. The experimental setup consists of a fluid pumping system and flow-measuring device, working area, electrical power system and temperature measuring system. The experiment studies of heat transfer intensity in small diameter channels are performed. The study compares experimental data obtained with the theoretical ones. The paper presents the graphs of the Nusselt criterion dependence on the Reynolds criterion and the dependence of the convective heat transfer coefficient on the Reynolds criterion.
Choice and justification of the optimum cooling temperature for HTS cableGlushaev, A V; Sokolova, E V; Kravchenko, D V; Kirilov, D N; Khrustovskaia, D A; Ivanov, L V
doi: 10.1088/1757-899X/826/1/012004pmid: N/A
At the first stage of designing a high-temperature superconducting (HTS) cable and its cryogenic refrigeration system (CRS), it is necessary to choose the optimum cooling temperature. The operating temperature is selected not only according to the critical parameters of the HTS conductor, but also taking into account other design and operational characteristics - geometry, length, operating current and the need to have subcooled nitrogen to prevent the occurrence of steam inclusions. Normally the range of cooling temperatures is limited by the critical temperature of the HTS conductor (THTS≤ 104К) and the triple point temperature of nitrogen (TLN≥ 63.15K). The choice of a certain temperature value will enable us to approximately evaluate the parameters of the CRS and overall characteristics of the cable. The article presents an analysis of the dependence of the electric power magnitude consumed by the CRS on the choice of the cooling temperature value and cable geometry. The analysis may be useful for determining the characteristics of the HTS cable operating at different temperature levels.
Mathematical model of compressor-condenser unitTatarenko, I V; Mitropov, V V; Nikitin, A A
doi: 10.1088/1757-899X/826/1/012005pmid: N/A
The article aims to consider a mathematical model of a compressor-condenser unit, based on the piston compressor with frequency control. The accepted initial data are temperatures and relative humidity of environment and a cooled room, geometrics of the main unit elements. CoolProp library was used for calculation of thermodynamic and thermophysical parameters. The flowchart of calculation of the compressor-condenser unit is provided in the article. The evaluation of the impact of change in environmental relative humidity on the heat transfer coefficient of the condenser has been made.
Investigation of the influence of 3D printing modes with ceramics and sintering on the shrinkage process of thin-walled modelsPiterskov, P; Egorov, S; Boyko, E; Grigoriev, M
doi: 10.1088/1757-899X/826/1/012006pmid: N/A
The subject of this study focuses on the effect of 3D printing and heat treatment of thin-walled models made of ceramic paste. The plates with dimensions of 20*5*40 mm were used as the models. The methodology includes the creation of ceramic objects using 3D printing by the SLA method (stereolithography) and their further heat treatment. The surface quality and the shrinkage percentage of samples printed in different modes and thermally processed under different conditions are compared. It was found that with a decrease in layer thickness and particle size, as well as an increase in the duration of heat treatment, the surface quality of the samples improves and the percentage of shrinkage decreases approximately 2 times. Using new modes and improved heat treatment conditions, samples with the least number of cracks and a lower percentage of shrinkage were obtained, which allows using this process to create ceramic products of higher quality. The method of creating ceramic products used in the work in the future can be applied in such industries as aircraft manufacturing, medicine, biotechnology and other fields.