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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ipolytech</journal-id><journal-title-group><journal-title xml:lang="ru">iPolytech Journal</journal-title><trans-title-group xml:lang="en"><trans-title>iPolytech Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2782-4004</issn><issn pub-type="epub">2782-6341</issn><publisher><publisher-name>Irkutsk National Research Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21285/1814-3520-2021-1-80-96</article-id><article-id custom-type="elpub" pub-id-type="custom">ipolytech-467</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЭНЕРГЕТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>POWER ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Аналитический метод решения задачи  потокораспределения тепловой сети</article-title><trans-title-group xml:lang="en"><trans-title>An analytical method for solving the problem  of heat network load flow</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Якшин</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Yakshin</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Якшин Сергей Владимирович,  ведущий инженер</p><p>664033, г. Иркутск, ул. Лермонтова, 130</p></bio><bio xml:lang="en"><p>Sergey V. Yakshin,  Leading Engineer</p><p>130, Lermontov St., Irkutsk 664033</p></bio><email xlink:type="simple">s.yakshin@isem.irk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт систем энергетики им. Л.А. Мелентьева СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Melentiev Energy Systems Institute of the Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>19</day><month>03</month><year>2021</year></pub-date><volume>25</volume><issue>1</issue><fpage>80</fpage><lpage>96</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Якшин С.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Якшин С.В.</copyright-holder><copyright-holder xml:lang="en">Yakshin S.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://ipolytech.elpub.ru/jour/article/view/467">https://ipolytech.elpub.ru/jour/article/view/467</self-uri><abstract><p>Целью исследования является разработка метода аналитического решения задачи потокораспределения шести-, одиннадцати- и двенадцатиконтурной тепловой сети; решение задачи оптимизации многоконтурной тепловой сети, включающей в себя выбор целевой функции и определение ряда варьируемых технических параметров. Для ускорения процесса оптимизации традиционно использовался метод декомпозиции графа тепловой сети, смысл декомпозиции заключается в разрезании графа сети в некоторых узлах для перехода многоконтурной схемы к разветвленной схеме в виде дерева. Оптимизация каждой разветвленной схемы проводилась методом динамического программирования, в результате чего получили новые значения варьируемых параметров на текущей итерации. Далее выполнили возврат к многоконтурной схеме, решили задачу потокораспределения и вычислили значение целевой функции. Итерационная сходимость метода декомпозиции математически не была доказана. Автором предложен метод расщепления графа, который позволяет исключить процедуру декомпозиции при оптимизации тепловой сети. Применены математическое моделирование гидравлической цепи, метод расщепления графа, аналитический метод решения алгебраического уравнения четвертой степени, в результате чего определена схема минимального элемента многоконтурной тепловой сети, показана возможность последовательного и параллельного соединения минимальных элементов, получены аналитические зависимости для задачи потокораспределения тепловой сети указанных схем. Предложенный метод аналитического решения задачи потокораспределения многоконтурной тепловой сети позволяет свести задачу расчета сложной схемы сети к расчету нескольких минимальных элементов, что существенно снижает объем вычислительной работы при моделировании гидравлической цепи. Приведенные примеры показывают, что погрешность расчетов не превышает 3%.</p></abstract><trans-abstract xml:lang="en"><p> The author aimed to develop an analytical solution to the problem of the load flow of a six-, eleven- and twelve-circuit heat network, as well as to solve the problem of optimisation of a multi-circuit heat network, including the choice of the objective function and the determination of a number of variable technical parameters. For accelerating the optimisation process, the method of decomposition of the heat network graph was used. Decomposition involves is cutting the network graph at some nodes for the transition of a multi-circuit scheme to a branched scheme in the form of a tree. Optimisation of each branched circuit was carried out by the dynamic programming method, as a result of which new values of the variable parameters were obtained at the current iteration. Next, the author returned to the multi-circuit scheme to solve the load flow problem and calculate the value of the objective function. The iterative convergence of the decomposition method was not mathematically proven. The author proposed a method for splitting the graph, which eliminates the decomposition procedure when optimising a heat network. The following methods were applied: mathematical modelling of the hydraulic circuit, graph splitting method and the analytical method for solving the algebraic equation of the fourth degree. The following results were achieved: a scheme of the minimum element of a multi-circuit heat network was determined, the possibility of series and parallel circuits of minimum elements was shown, and analytical dependencies for the problem of load flow of a heat network of these schemes were obtained. The proposed analytical solution of the load flow problem for a multi-circuit heat network allows the problem of calculating a complex network to be reduced to the calculation of several minimum elements, which significantly reduces the amount of computational work when modelling a hydraulic circuit. The provided examples show that the calculation error does not exceed 3%. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>тепловая сеть</kwd><kwd>линеаризация уравнений</kwd><kwd>гидравлический расчет</kwd><kwd>многоконтурность</kwd><kwd>потокораспределение</kwd><kwd>минимальный элемент сети</kwd></kwd-group><kwd-group xml:lang="en"><kwd>heat network</kwd><kwd>linearization of equations</kwd><kwd>hydraulic calculation</kwd><kwd>multi-circuit</kwd><kwd>flow load</kwd><kwd>minimal network element</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Меренков А.П., Хасилев В.Я. Теория гидравлических цепей. М.: Изд-во «Наука», 1985. 278 с.</mixed-citation><mixed-citation xml:lang="en">Merenkov АP, Khasilev VYa. The theory of hydraulic circuits. Мoscow: Nauka; 1985, 278 p. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Сеннова Е.В., Сидлер В.Г. Математическое моделирование и оптимизация развивающихся теплоснабжающих систем. Новосибирск: Изд-во «Наука», 1987. 222 с.</mixed-citation><mixed-citation xml:lang="en">Sennova EV, Sidler VG. Mathematical modeling and optimization of developing heat supply systems. Novosibirsk: Nauka; 1987, 222 p. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Новицкий Н.Н., Аверьянов В.К., Сеннова Е.В., Карасевич А.М., Стенников В.А., Еделева О.А. [и др.]. Развитие методов теории гидравлических цепей для анализа и синтеза свойств трубопроводных систем как объектов управления // Трубопроводные системы энергетики: математическое моделирование и оптимизация. Новосибирск: Наука, 2010. C. 58–73.</mixed-citation><mixed-citation xml:lang="en">Novitsky NN, Aver'yanov VK, Sennova EV, Karasevich AM, Stennikov VA, Edeleva OA, et al. Development of methods of hydraulic circuits theory for analysis and synthesis of properties of pipeline systems as control objects. In: Truboprovodnye sistemy energetiki: matematicheskoe i komp'yuternoe modelirovanie = Energy Pipeline Systems: Mathematical and Computer Modeling. Novosibirsk: Nauka; 2010, p. 58–73. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Токарев В.В., Шалагинова З.И. Методика многоуровневого наладочного расчета теплогидравлического режима крупных систем теплоснабжения с промежуточными ступенями управления // Теплоэнергетика. 2016. № 1. C. 71–80. https://doi.org/10.1134/S0040363616010112</mixed-citation><mixed-citation xml:lang="en">Tokarev VV, Shalaginova ZI. Technique of multilevel adjustment calculation of the heat-hydraulic mode of the major heat supply systems with the intermediate control stages. Teploenergetika = Thermal Engineering. 2016;1:71-80. (In Russ.) https://doi.org/10.1134/S0040363616010112</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Токарев В.В. Разработка методики секционирования кольцевых тепловых сетей закрытых систем теплоснабжения // Теплоэнергетика. 2018. № 6. С. 84–94. https://doi.org/10.1134/S0040363618060103</mixed-citation><mixed-citation xml:lang="en">Tokarev VV. Developing a procedure for segmenting ring heat networks of closed heat supply systems. Teploenergetika = Thermal Engineering. 2018;6:84–94.  (In Russ.) https://doi.org/10.1134/S0040363618060103</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Cross H. Analysis of flow in networks of conduits or conductors. Series/Report: University of Illinois. Engineering Experiment Station. Bulletin; no. 286. 1936. [Электронный ресурс]. URL: http://hdl.handle.net/2142/4433 (25.05.2020).</mixed-citation><mixed-citation xml:lang="en">Cross H. Analysis of flow in networks of conduits or conductors. Series/Report: University of Illinois. Engineering Experiment Station. Bulletin; no. 286. 1936. Available from: http://hdl.handle.net/2142/4433 [Accessed 25th May 2020].</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">LaViolette M. On the history, science, and technology included in the Moody diagram // Journal of Fluids Engineering. 2017. Vol. 139. Iss. 3. https://doi.org/10.1115/1.4035116</mixed-citation><mixed-citation xml:lang="en">LaViolette M. On the history, science, and technology included in the Moody diagram. Journal of Fluids Engineering. 2017;139:3. https://doi.org/10.1115/1.4035116</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Todini E., Pilati S. A gradient algorithm for the analysis of pipe networks // Computer applications in water supply / eds. B Coulbeck, Chun-Hou Orr. London: John Wiley &amp; Sons Research Studies Press, 1988. [Электронный ресурс]. URL: https://www.researchgate.net/profile/Ezio_Todini/publicati on/221936261_A_gradient_method_for_the_analysis_of_ pipe_networks/links/0046351c42430e1178000000.pdf (25.05.2020).</mixed-citation><mixed-citation xml:lang="en">Todini E, Pilati S. A gradient algorithm for the analysis of pipe networks. In: Coulbeck B, Orr Chun-Hou (eds.). Computer applications in water supply. London: John Wiley &amp; Sons Research Studies Press; 1988. Available from: https://www.researchgate.net/profile/Ezio_Todini/publicati on/221936261_A_gradient_method_for_the_analysis_of_ pipe_networks/links/0046351c42430e1178000000.pdf [Accessed 25th May 2020].</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Brkić D., Ćojbašić Ž. Evolutionary optimization of Colebrook's turbulent flow friction approximations // Fluids. 2017. Vol. 2. Iss. 2. https://doi.org/10.3390/fluids2020015</mixed-citation><mixed-citation xml:lang="en">Brkić D, Ćojbašić Ž. Evolutionary optimization of Colebrook's turbulent flow friction approximations. Fluids. 2017;2(2). https://doi.org/10.3390/fluids2020015</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Praks P., Brkic D. Choosing the Optimal Multi-Point Iterative Method for the Colebrook Flow Friction Equation // Processes. 2018. Vol. 6. Iss. 8. https://doi.org/10.3390/pr6080130</mixed-citation><mixed-citation xml:lang="en">Praks P, Brkic D. Choosing the optimal multi-point iterative method for the Colebrook flow friction equation. Processes. 2018;6(8). https://doi.org/10.3390/pr6080130</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Praks P., Brkic D. Advanced iterative procedures for solving the implicit Colebrook equation for fluid flow friction // Advances in Civil Engineering. 2018. Vol. 2018. https://doi.org/10.1155/2018/5451034</mixed-citation><mixed-citation xml:lang="en">Praks P, Brkic D. Advanced iterative procedures for solving the implicit Colebrook equation for fluid flow friction. Advances in Civil Engineering. 2018;2018. https://doi.org/10.1155/2018/5451034</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Medhi Das B., Sarma B., Mohan Das M. Error Analysis of Friction Factor Formulae with Respect to ColebrookWhite Equation // International Journals of Science and Research. 2017. Vol. 6. Iss. 3. Р. 2105–2109.</mixed-citation><mixed-citation xml:lang="en">Medhi Das B, Sarma B, Mohan Das M. Error analysis of friction factor formulae with respect to Colebrook-White equation. International Journals of Science and Research. 2017;6(3):2105–2109.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Новицкий H.H., Токарев В.В. Релейная методика расчета потокораспределения в гидравлических цепях с регулируемыми параметрами // Известия Российской академии наук. Энергетика. 2001. № 2. С. 88—98.</mixed-citation><mixed-citation xml:lang="en">Novitsky NN, Tokarev VV. Relay method of calculation of flow distribution in hydraulic circuits with adjustable parameters. Izvestiya Rossijskoj akademii nauk. Energetika. 2001;2:88–98. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Баранчикова Н.И., Епифанов С.П., Зоркальцев В.И., Куртин А.В., Обуздин С.Ю. Потокораспределение в системах подачи и распределения воды с автоматическими регуляторами давления // Водоснабжение и санитарная техника. 2017. № 4. С. 55–62.</mixed-citation><mixed-citation xml:lang="en">Baranchikova NI, Epifanov SP, Zorkal'tsev VI, Kurtin AV, Obuzdin SYu. Flow distribution in water supply and distribution systems with automatic pressure regulators. Vodosnabgenie i sanitarnaya texnika = Water supply and sanitary technique. 2017;4:55–62. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Корельштейн Л.Б. Существование, единственность и монотонность решения задачи потокораспределения в гидравлических цепях с зависящими от давления замыкающими соотношениями // Математические модели и методы анализа и оптимального синтеза развивающихся трубопроводных и гидравлических систем: тр. XVI Всерос. науч. семинара (г. Иркутск, 26 июня – 2 июля 2018 г.) Иркутск: Изд-во ИСЭМ СО РАН, 2018. С. 55–83.</mixed-citation><mixed-citation xml:lang="en">Korel’shtein LB. Existence, uniqueness and monotonicity of the solution of the flow distribution problem in hydraulic circuits with pressure-dependent closing relations. In: Matematicheskie modeli i metody analiza i optimal'nogo sinteza razvivayushchihsya truboprovodnyh i gidravlicheskih sistem: trudy XVI Vserossijskogo nauchnogo seminara = Mathematical Models and Methods of Analysis and Optimal Synthesis of the Developing Pipeline and Hydraulic Systems: Proceedings of XVI AllRussian scientific seminar. June 26 – July 2 2018, Irkutsk. Irkutsk: Melentiev Energy Systems Institute of the Siberian Branch of the Russian Academy of Sciences; 2018,  p. 55–83. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Brkic D. Discussion of «Economics and Statistical Evaluations of Using Microsoft Excel Solver in Pipe Network Analysis» by I.A. Oke, A. Ismail, S. Lukman, S.O. Ojo, O.O. Adeosun, and M.O. Nwude // Journal of Pipeline Systems Engineering and Practice. 2018. Vol. 9. Iss. 3. https://doi.org/10.1061/(ASCE)PS.1949-1204.0000319</mixed-citation><mixed-citation xml:lang="en">Brkic D. Discussion of «Economics and statistical evaluations of using Microsoft Excel solver in pipe network analysis» by I.A. Oke, A. Ismail, S. Lukman, S.O. Ojo, O.O. Ade-osun, and M.O. Nwude. Journal of Pipeline Systems Engineering and Practice. 2018;9:3. https://doi.org/10.1061/(ASCE)PS.1949-1204.0000319</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Hoyo Arce I., Herrero Lopez S., Lopez Perez S., Rama M., Klobut K., Febres J.A. Models for fast modelling of district heating and cooling networks // Renewable and Sustainable Energy Reviews. 2018. Vol. 82. Part 2. Р. 1863–1873. https://doi.org/10.1016/j.rser.2017.06.109</mixed-citation><mixed-citation xml:lang="en">Hoyo Arce I, Herrero Lopez S, Lopez Perez S, Rama M, Klobut K, Febres JA. Models for fast modelling of district heating and cooling networks. Renewable and Sustainable Energy Reviews. 2018;82(2):1863–1873. https://doi.org/10.1016/j.rser.2017.06.109</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Якшин С.В. Метод расщепления графа и принцип аддитивности тепловой сети // Вестник Иркутского государственного технического университета. 2017. Т. 21. № 4. С. 127–138. https://doi.org/10.21285/1814-35202017-4-127-138</mixed-citation><mixed-citation xml:lang="en">Yakshin SV. The method of graph splitting and the principle of heating network additivity. Vestnik Irkutskogo gosudarstvennogo tehnicheskogo universiteta = Proceedings of Irkutsk State Technical University. 2017;21(4):127–138. (In Russ.) https://doi.org/10.21285/1814-3520-2017-4-127-138.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Якшин С.В. Применение метода расщепления графа при оптимизации параметров тепловой сети // Вестник Иркутского государственного технического университета. 2018. Т. 22. № 10. С. 129–140. https://doi.org/10.21285/1814-3520-2018-10-129-140</mixed-citation><mixed-citation xml:lang="en">Yakshin SV. Application of graph splittance method when optimizing heating network parameters. Vestnik Irkutskogo gosudarstvennogo tehnicheskogo universiteta = Proceedings of Irkutsk State Technical University. 2018;22(10):129–140. (In Russ.) https://doi.org/10.21285/1814-3520-2018-10-129-140</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Каганович Б.М., Стенников В.А., Зароднюк М.С., Якшин С.В. Равновесное экологическое моделирование интегрированных энергетических систем // Математические модели и методы анализа и оптимального синтеза развивающихся трубопроводных и гидравлических систем: тр. XVI Всерос. науч. семинара (г. Иркутск, 26 июня – 2 июля 2018 г.). Иркутск: Изд-во ИСЭМ СО РАН, 2018. С. 34–43.</mixed-citation><mixed-citation xml:lang="en">Kaganovich BM, Stennikov VA, Zarodnyuk MS, Yakshin SV. Equilibrium ecological modeling of integrated energy systems. In: Matematicheskie modeli i metody analiza i optimal'nogo sinteza razvivayushchihsya truboprovodnyh i gidravlicheskih sistem: trudy XVI Vserossijskogo nauchnogo seminara = Mathematical Models and Methods of Analysis and Optimal Synthesis of the Developing Pipelines and Hydraulic Systems: Proceedings of XVI All-Russian scientific seminar. June 26 – July 2 2018, Irkutsk. Irkutsk: Melentiev Energy Systems Institute of the Siberian Branch of the Russian Academy of Sciences; 2018, p. 34–43. (In Russ.)</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
