THE MULTIFACTORIALITY OF THE PROCEDURE FOR OPTIMIZING THE DESIGN OF A TWISTED HEAT EXCHANGER LOCATED IN AN ANNULAR CHANNEL DURING LAMINAR MOTION
Abstract
Cryogenic units that operate on the J-T (Joule-Thomson) cycle have found wide application due to the relatively simple design of the main elements, low operating costs, reliability and long service life. To a large extent, the efficiency of the installation depends on the choice of the coolant, the schematic solution, as well as on the design of the recuperative heat exchanger. The ability to compensate for temperature and mechanical stresses due to the twisted structure ensures long-term and trouble-free operation of the heat exchange equipment. The main goal of many studies was to determine the influence of thermophysical properties of the coolant, its mode parameters and geometric characteristics of the surface on heat exchange and hydrodynamics. On the basis of the results of the research, the optimization of the structure was carried out and empirical dependencies were given for calculating its parameters. The analysis of the presented empirical dependencies does not give a final answer regarding the development of a generalized method of calculating microheat exchangers of the Hampson type used in cryogenic installations. It is proposed to calculate the geometric characteristics of this type of heat exchangers, taking into account the influence on the intensity of heat exchange not only of the mode parameters of the heat carrier and the working fluid, but also of the design characteristics of the equipment, namely: the diameter and length of the pipe, the diameter of the coil, the gap between the heat exchange surface and the outer and inner casings, step characteristics of the coil. The work implements the methodology of calculation and optimization of the design of a twisted heat exchanger located in an annular channel with forced convection and laminar flow regime. The main emphasis is made on taking into account the change in the intensity of heat exchange along the length of the heat exchange surface, the length of the initial heat section is determined. An experimental study of heat exchange processes during forced convection of gas in a coiled heat exchanger in the laminar mode of movement of the heat carrier made it possible to establish the dependence of the heat transfer coefficient aк on the main geometric characteristics of the heat exchanger: the relative pitch of the coil, the gap between the heat exchange pipe and the outer and inner surfaces of the housing. On the basis of research results, dimensionless corrections were determined, with the help of which variational calculations of twisted heat exchanger structures located in annular channels are performed in order to optimize their geometric characteristics. Bibl. 31, Fig. 1.
Downloads
References
Wang G., Wang D., Peng X., Han L., Xiang S., Ma F. Experimental and numerical study on heat transfer and flow characteristics in the shell side of helically coiled trilobal tube heat exchanger. Appl. Therm. Eng. 2018. 149. pp. 772–787. — https://doi.org/10.1016/j.applthermaleng.2018.11.055
Xu X., Zhang Y., Chao L. Experimental investigation of heat transfer of supercritical CO2 cooled in helically coiled tubes based on exergy analysis. Int. J. Refrig. 2016. 67. pp. 190–201. — https://doi.org/10.1016/j.ijrefrig.2016.03.010
Wang C., Shengju L., Wu J., Li Z. Effects of temperature-dependent viscosity on fluid flow and heat transfer in a helical rectangular duct with a finite pitch. Brazilian Journal of Chemical Engineering. 2014. 31 (3). pp. 787–797. — https://doi.org/10.1590/0104-6632.20140313s00002676
Genic S.B., Jacimovic B.M., Jaric M.S. Research on the shell-side thermal performances of heat exchangers with helical tube coils. Int. J. Heat Mass Transf. 2012. 55 (15–16). pp. 4295–4300. — https://doi.org/10.1016/j.ijheatmasstransfer.2012.03.074
Dilevskaya Ye.V. Kriogennyye mikroteploobmenniki. [Cryogenic micro heat exchangers]. Moscow : Mashinostroyeniye, 1978. 165 p. (Rus.)
Zachar A. Analysis of coiled-tube heat exchangers to improve heat transfer rate with spirally corrugated wall. Int. J. Heat Mass Transf. 2010. 53. pp. 3928–3939. — https://doi.org/10.1016/j.ijheatmasstransfer.2010.05.011
Andrzejczyk R, Muszynski T. An Experimental investigation on the effect of new continuous core-baffle geometry on the mixed convection heat transfer in shell and coil heat exchanger. Appl. Therm. Eng. 2018. 136. pp. 237–251. — https://doi.org/10.1016/j.applthermaleng.2018.03.003
Salem M.R., Elshazly K.M., Sakr R.Y. Effect of Coil Torsion on Heat transfer and Pressure Drop Characteristics of Shell and Coil Heat Exchanger. J. Therm. Sci. Eng. Appl. 2016. 8. — https://doi.org/10.1115/1.4030732
Naphon P., Wongwises S. An experimental study on the in-tube convective heat transfer coefficients in a spiral coil heat exchanger, Int. Conmiun. Heat Mass. 2002. 29. pp. 797–809. — https://doi.org/10.1016/S0735-1933(02)00370-6
Wongwises S., Naphon P. Heat Transfer Characteristics And Performance Of A Spirally Coiled Heat Exchanger Under Sensible Cooling Conditions. Jsme Int. J. B-Fluid. 2005. 48. pp. 810–819. — https://doi.org/10.1299/jsmeb.48.810
Moawed M. Experimental study of forced convection from helical coiled tubes with different parameters. Energ. Conversion Management. 2011. 52. pp. 1150–1156. — https://doi.org/10.1016/j.enconman.2010.09.009
Mirgolbabaei H., Taherian H., Domairry G. Numerical estimation of mixed convection heat transfer in vertical helically coiled tube heat exchangers. Int. J. Num. Meth. Fl. 2011. 66. pp. 805–819. — https://doi.org/10.1002/fld.2284
Ghorbani N., Taherian H., Gorji M., Mirgolbabaei H. An experimental study of thermal performance of shell-and-coil heat exchangers. Int. Conmiun. Heat Mass. 2010. 37. pp. 775–781. — https://doi.org/10.1016/j.icheatmasstransfer.2010.02.001
[Thermal calculation of boilers (A Standard Method)]. Eds. S.I.Movchan, G.M.Abryutin. St.-Petersburg : NPO CKTI, 1998. 256 p. — https://djvu.online/file/NgQFv7pUaRpaZ (Rus.)
Tuz V.O., Lebed N.L. [Thermohydraulic distribution in twisted micro heat exchangers mounted in annular channels]. Energy Technologies and Resource Saving. 2021. No. 4. pp. 71–79. — https://doi.org/10.33070/etars.4.2021.07 (Ukr.)
Lobunets Yu.M. [Application of cryogenic thermoelectric generators in energy storage systems]. Energy Technologies and Resource Saving. 2022. No. 1. pp. 69–73. — https://doi.org/10.33070/etars.1.2022.07 (Ukr.)
Khalatov A.A., Avramenko A.A., Shevchuk I.V. Teploobmen i gidrodinamika v poljah centrobezhnyh massovyh sil. [Heat transfer and hydrodynamics in centrifugal force field]. Kyiv : Vipol, 1999. 3. 476 p., ISBN 5-77-02-1067-2. (Rus.)
Ujhidy A., Nemeth J., Szepvolgyi J. Fluid flow in tubes withhelical elements. Chem. Eng. & Processing. 2003. 42. pp. 1–7. — https://doi.org/10.1016/S0255-2701(01)00194-5
Elan EI.Z., Li B.X., Yu B.Y. Numerical study of flow and heat transfer characteristics in outward convex corrugated tubes. Int. J. Heat Mass Transf. 2012. 55. pp. 7782–78021. — https://doi.org/10.1016/j.ijheatmasstransfer.2012.08.007
Dravid A.N., Smith K.A., Merrill E.W. Effect of secondary fluid motion on laminar flow heat transfer in helically coiled tubes. Aiche J. 1971. 17. pp. 1114–1122. — https://doi.org/10.1016/j.ijheatmasstransfer.2012.08.007
Salimpour M.R. Heat transfer coefficients of shell and coiled tube heat exchangers. Exp. Therm. Fluid Sci. 2009. 33. pp. 203–207. — https://doi.org/10.1016/j.expthermflusci.2008.07.015
Naphon P., Wongwises S. Investigation of the Performance of a Spiral — Coil Finned Tube Heat Exchanger under Dehumidifying Conditions. J. Eng. Phys. Thermophys. 2003. 76. pp. 83–92. — https://doi.org/10.1023/A:1022967208737
Pawar S.S., Sunnapwar V.K. Experimental and CFD investigation of convective heat transfer in helically coiled tube heat exchanger. Chem. Eng. Research & Design. 2014. 92. pp. 2294–2312. — https://doi.org/10.1016/j.cherd.2014.01.016
Duan J., Xiong Y., Yang D. Study on the effect of multiple spiral fins for improved phase change process. Appl. Therm. Eng. 2020. 169. Article 114966. — https://doi.org/10.1016/j.applthermaleng.2020.114966
Majidi D., Alighardashi H., Farhadi F. Experimental studies of heat transfer of air in a double-pipe helical heat exchanger. Appl. Therm. Eng. 2018. 133. pp. 276–282. — https://doi.org/10.1016/j.applthermaleng.2018.01.057
Wu J., Zhao J., Sun X., Liu S., Wang M. Design Method and Software Development for the Spiral-Wound Heat Exhanger with Bilateral Phase Change. Appl. Therm. Eng. 2020. 166. Article 114674. — https://doi.org/10.1016/j.applthermaleng.2019.114674
Moradi H., Bagheri A., Shafaee M., Khorasani S. Experimental investigation on the thermal and entropic behavior of a vertical helical tube with none-boiling upward air-water two-phase flow. Appl. Therm. Eng. 2019. 157. Article 113621. — https://doi.org/10.1016/j.applthermaleng.2019.04.031
Wu J., Liu S., Wang M. Design Process calculation method and optimization of the spiral-wound heat exchanger with bilateral phase change. Appl. Therm. Eng. 2018. 134. pp. 360–368. — https://doi.org/10.1016/j.applthermaleng.2018.01.128
Wang S., Jian G., Xiao J., Zhang Z. Optimization investigation on configuration parameters of spiral-wound heat exchanger using Genetic Aggregation response surface and Multi-Objective Genetic Algorithm. Appl. Therm. Eng. 2017. 119. pp. 603–609. — https://doi.org/10.1016/j.applthermaleng.2017.03.100
Tuz V.O., Lebed N.L., Lytvynenko M.P. [Particularity of Heat Exchange of Twisted Heat Exchangers in External Flow]. NTU “KhPI” Bulletin: Power and Heat Engineering Processes and Equipment. 2021. No. 3. pp. 12–17. — https://doi.org/10.20998/2078-774X.2021.03.02 (Ukr.)
Tuz V.O., Lebed N.L., Lytvynenko M.P. [Heat transfer in coil heat exchangers with varying geometric characteristics]. POWER ENGINEERING: economics, technique, ecology. 2021. No. 4. pp. 71–78. — https://doi.org/10.20535/1813-5420.4.2021.257272 (Ukr.)
Copyright (c) 2023 Energy Technologies & Resource Saving
This work is licensed under a Creative Commons Attribution 4.0 International License.
ISSN 
ISSN 
