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Registration Number

0215U009188, 0113U000746 , R & D reports

Title

Investigation of heat transfer in combined systems of evaporation-condensing type and optimization of systems performances

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Head

Pysmennyy Eugen Nikolaevich,

Registration Date

18-11-2015

Organization

Faculty of аircraft and space systems NTUU "KPI"

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The object of study - combined heat transfer systems of evaporation-condensing type. The purpose of the study - to gain the regularities of heat transfer processes in complex combined systems of evaporation-condensing type, basic promising scientific and technological solutions for their creation and development of the recommendations for the rational design of these systems on this basis. Research methods are the analysis of the current state of the work subject, theoretical and experimental study of the processes characteristics in the systems under consideration, optimization of system characteristics, development of basic scientific and technological solutions for such systems creation. The study of thermophysical factors limiting heat transfer capacity of the combined heat transfer systems of evaporation-condensing type, resulted in finding the dependences for determination of the maximum heat flows value. For the identified heat transfer mechanisms within the respective ranges of the influencing parameters, properties and characteristics of the processes estimated dependencies are proposed to determine heat transfer coefficients that satisfactorily generalize the experimental data. The methodology of calculation and analytical determination of thermal resistance of the fin-carrier pipe contact in consideration of the technological process peculiarities of finned tubes manufacturing is developed. Methods to improve the heat transporting capacity of combined heat transfer systems based on efficient capillary-arterial system creation and separation of the channels for the steam and condensate flow passing are ascertained and investigated. Sufficiently high capillary-transporting capability of metal fine-fiber capillary structures is obtained, especially when working against gravity. Methods to amend the heat transporting capacity of combined heat transfer systems are researched and analyzed that are based on the application of heat transfer elements packages, using the principle of heat transfer contour elements, creating an effective porous material, separation of the channels for the steam and condensate flow passing. Reviewed and solved the optimization problem of achieving the maximum heat transfer capacity for the most typical ways of interaction between capillary forces and gravity. Based on the analysis of the regularities of the heat transfer and aerodynamics processes, the dependences are obtained to determine the optimal correlations of the zones lengths in which the combined system of heat transfer has the best technical and economic indicators. The basic points of thermal calculation of combined heat transfer systems of evaporation-condensing type are worked out in accordance with distinctive thermal schemes of heat transfer process. As a result of the comparative analysis of heat transport ability the comparison characteristics of traditional heat transfer systems and heat transport systems of evaporation-condensing type are got. Titanium heat-transmitting element with copper-fibrous capillary structure on the evaporation area is designed, manufactured and tested, that is meant for operation in vertical position (evaporation area is below condensation area) and two arterial titanium heat-transfer elements with copper-fibrous capillary systems that are meant for operation in horizontal position and at small angles of inclination. Scientific production created in this work is a necessary base for subsequent implementation of research and development works, development of appropriate design and technological documentation for standard construction of combined heat transfer systems of evaporation-condensing type with different functional purpose and industrial engineering of such systems. Scientific and technical level of the work is according to international standards. The work results will be used by design, construction, and industrial organizations and enterprises operating in nuclear, thermal, alternative energy sector, industrial heat engineering, instrument engineering and so on. Implementation of this work results will be carried out on the terms of contracts, the subject of which will be protected technical and scientific products, modified according to specific technical requirements and submitted either in the form of completed research work, or in the form of research and development work including technical documentation and prototypes.

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Гершуні О.Н.
Ніщик О.П.
Розумовський В.Г.

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2020-04-02