Материал: Методика расчета характеристик теплообменных аппаратов типа «Труба в трубе»
Известия Томского политехнического университета. Инжиниринг георесурсов. 2017. Т. 328. № 8. 75–82 Голдаев С.В., Радюк К.Н. Методика расчета характеристик теплообменных аппаратов типа «труба в трубе»
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Информация об авторах
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Поступила 16.06.2017 г.
Голдаев С.В., доктор физико математических наук, профессор кафедры теоретической и промышленной те плотехники Энергетического института Национального исследовательского Томского политехнического уни верситета.
Радюк К.Н., аспирант кафедры теоретической и промышленной теплотехники Энергетического института, ас систент кафедры транспорта и хранения нефти и газа Института природных ресурсов Томского политехниче ского университета.
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Goldaev S.V. et al. / Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering. 2017. V. 328. 8. 75–82
UDC 621.1.016.4.001.24:51
METHODOLOGY FOR CALCULATING THE PIPE|IN|PIPE HEAT EXCHANGER CHARACTERISTICS
Sergey V. Goldaev1, svgoldaev@tpu.ru
Karina N. Radyuk1, radyuk@tpu.ru
1National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia.
Relevance of the discussed issue is caused by inaccuracy of calculation methods for pipeAinApipe heat exchangers using various simpliA fications. The heat exchangers are used in various industries: chemical, food, geothermal power systems, hot water supply systems. The main aim of the study is to develop the improved methodology for calculating thermal and geometric characteristics of pipeAinApiA pe heat exchangers without using simplifications and to estimate errors.
The methods used in the study: the calculation using the criterion equation for the flow in circular pipe, logarithmic mean temperature difference, the heat transfer coefficient for cylindrical wall, an iterative method for determining correction for nonisothermicity.
The results. The authors have calculated the pipeAinApipe heat exchanger with specified parameters and analyzed the calculation results is comparison with other methods using various simplifications, their errors were estimated.
Conclusions. It was found, the replacement of the cylindrical wall by a flat one, the use of the arithmetic mean temperature difference instead of the logarithmic one and calculating the heat transfer coefficient from the heated wall to the heating liquid without gap thicA kness correction result in underestimated values of the surface area by 30–47 %. The proposed method allows calculating the heat tranA sfer coefficient more accurately in the cylindrical section, the temperature difference between primary and secondary water, taking inA to account the curvature of the pipe walls and the casing. The automation of the methodology by implementing on Turbo Pascal faciliA tates the calculation. The use of the implemented methodology for operation of the pipeAinApipe heat exchangers at the design stage will reduce material costs.
Key words:
Heat exchanger, heat calculation, criterial equation, heat transfer, heat flow, cylindrical wall, flat wall, logarithmic mean temperature difference.
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Received: 16 June 2017.
Information about the authors
Sergey V. Goldaev, Dr. Sc., professor, National Research Tomsk Polytechnic University.
Karina N. Radyuk, postgraduate, assistant, National Research Tomsk Polytechnic University.
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