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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">probener</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. ПРОБЛЕМЫ ЭНЕРГЕТИКИ</journal-title><trans-title-group xml:lang="en"><trans-title>Power engineering: research, equipment, technology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1998-9903</issn><issn pub-type="epub">2658-5456</issn><publisher><publisher-name>Kazan State Power Engineering  University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.30724/1998-9903-2026-28-4-126-138</article-id><article-id custom-type="elpub" pub-id-type="custom">probener-4003</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>ЭНЕРГЕТИЧЕСКИЕ СИСТЕМЫ И КОМПЛЕКСЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ENERGY SYSTEMS AND COMPLEXES</subject></subj-group></article-categories><title-group><article-title>Влияние поперечного оребрения на кинетику зарядки цилиндрического аккумулятора тепла фазового перехода</article-title><trans-title-group xml:lang="en"><trans-title>The effect of transverse fins on the charging kinetics of a cylindrical phase transition heat accumulator</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>Пономарев</surname><given-names>Р. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ponomarev</surname><given-names>R. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Пономарев Роман Андреевич – ассистент кафедры «Промышленная теплоэнергетика и системы теплоснабжения»</p><p>г. Казань</p></bio><bio xml:lang="en"><p>Roman A. Ponomarev</p><p>Kazan</p></bio><email xlink:type="simple">romanponomarevich@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ваньков</surname><given-names>Ю. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Vankov</surname><given-names>Yu. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ваньков Юрий Витальевич – д-р. техн. наук, профессор, заведующий кафедрой «Промышленная теплоэнергетика и системы теплоснабжения»</p><p>г. Казань</p></bio><bio xml:lang="en"><p>Yurij. V Vankov</p><p>Kazan</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Казанский государственный энергетический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kazan State Power Engineering University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>15</day><month>09</month><year>2026</year></pub-date><volume>28</volume><issue>4</issue><fpage>126</fpage><lpage>138</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Пономарев Р.А., Ваньков Ю.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Пономарев Р.А., Ваньков Ю.В.</copyright-holder><copyright-holder xml:lang="en">Ponomarev R.A., Vankov Y.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://www.energyret.ru/jour/article/view/4003">https://www.energyret.ru/jour/article/view/4003</self-uri><abstract><p>АКТУАЛЬНОСТЬ исследования обусловлена необходимостью интенсификации теплообмена в аккумуляторах тепла фазового перехода (АТФП) на основе парафиновых теплоаккумулирующих материалов. Низкая теплопроводность парафинов (0,15–0,30 Вт/(м·К)) приводит к недопустимо большому времени зарядки аккумулятора. Поперечное оребрение является одним из наиболее технологичных пассивных методов интенсификации, однако в литературе отсутствуют однозначные рекомендации по выбору оптимального количества ребер для АТФП цилиндрической геометрии.</p><p>ЦЕЛЬ работы — экспериментальное определение оптимального количества поперечных ребер цилиндрического АТФП с применением парафина в качестве теплоаккумулирующего материала, обеспечивающего минимальное время зарядки.</p><sec><title>МЕТОДЫ</title><p>МЕТОДЫ. Исследования проводились на прозрачной модели цилиндрического АТФП с медным трубчатым теплообменником и поперечными ребрами. Испытаны три конфигурации: с 6, 8 и 10 ребрами. Регистрация процесса плавления выполнялась методом оптической визуализации с последующей цифровой обработкой изображений в среде MATLAB по адаптивному пороговому алгоритму. Для каждой конфигурации проведено четыре повторных эксперимента.</p></sec><sec><title>РЕЗУЛЬТАТЫ</title><p>РЕЗУЛЬТАТЫ. Установлено, что процесс плавления характеризуется тремя стадиями: прогрев твердого парафина (0–60 мин, средняя скорость плавления 0,22 %/мин), интенсивное плавление с развитой естественной конвекцией (60–180 мин, 0,55 %/мин) и завершающая стадия (180–220 мин, 0,26 %/мин). Конфигурация с 10 ребрами обеспечивает наименьшее время достижения 50% расплава (127,8 мин), однако по времени достижения 80% расплава практически не отличается от конфигурации с 8 ребрами (162,0 и 162,7 мин соответственно). Максимальную пиковую скорость плавления демонстрирует конфигурация с 8 ребрами — 1,52 %/мин, что на 55% выше, чем у 6 ребер.</p></sec><sec><title>ЗАКЛЮЧЕНИЕ</title><p>ЗАКЛЮЧЕНИЕ. По совокупности критериев (время зарядки, пиковая скорость плавления, материалоемкость, полезный объем) оптимальной признана конфигурация с 8 поперечными ребрами. Увеличение количества ребер до 10 не приводит к дальнейшему сокращению времени зарядки из-за частичного подавления естественной конвекции в узких межреберных каналах (межреберное расстояние 15–17 мм). Полученные результаты могут быть использованы при проектировании цилиндрических АТФП для систем горячего водоснабжения, а также для верификации численных моделей.</p></sec></abstract><trans-abstract xml:lang="en"><p>RELEVANCE of the study is due to the need to intensify heat transfer in phase change heat accumulators (PCHA) based on paraffinic heat storage materials. Low thermal conductivity of paraffins (0.15–0.30 W/(m·K)) This leads to an unacceptably long battery charging time. Transverse finning is one of the most technologically advanced passive intensification methods, however, there are no clear recommendations in the literature on choosing the optimal number of ribs for the cylindrical geometry of accumulator.</p><sec><title>THE PURPOSE</title><p>THE PURPOSE. experimental determination of the optimal number of transverse ribs of a cylindrical PCHA with a paraffin heat storage material, which ensures a minimum charging time while maintaining a sufficient useful volume.</p></sec><sec><title>METHODS</title><p>METHODS. The research was carried out on a transparent cylindrical PCHA model with a copper tubular heat exchanger and transverse fins. Three configurations have been tested: with 6, 8 and 10 ribs. The melting process was recorded using optical imaging followed by digital image processing in MATLAB using an adaptive threshold algorithm. Four repeated experiments were performed for each configuration.</p></sec><sec><title>RESULTS</title><p>RESULTS. It was found that the melting process is characterized by three stages: heating of solid paraffin (0-60 min, average rate of 0.22%/min), intensive melting with developed natural convection (60-180 min, 0.55%/min) and the final stage (180-220 min, 0.26%/min). The 10-rib configuration provides the shortest time to reach 50% of the melt (127.8 minutes), however, the time to reach 80% of the melt is practically the same as the 8-rib configuration (162.0 and 162.7 minutes, respectively). The maximum peak melting rate is demonstrated by the configuration with 8 fins — 1.52%/min, which is 55% higher than that of 6 fins.</p></sec><sec><title>CONCLUSION</title><p>CONCLUSION. According to a set of criteria (charging time, peak melting rate, material consumption, useful volume), the configuration with 8 transverse ribs is considered optimal. Increasing the number of ribs to 10 does not lead to a further reduction in charging time due to partial suppression of natural convection in narrow intercostal channels (intercostal distance 15-17 mm). The results obtained can be used in the design of cylindrical PCHA for hot water supply systems, as well as for verification of numerical models.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>аккумулятор тепла</kwd><kwd>фазовый переход</kwd><kwd>интенсификация теплообмена</kwd><kwd>оребрение</kwd><kwd>парафин</kwd><kwd>свободная конвекция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>heat accumulator</kwd><kwd>phase transition</kwd><kwd>intensification of heat exchange</kwd><kwd>finning</kwd><kwd>paraffin</kwd><kwd>free convection</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа, по результатам которой выполнена статья, проведена в рамках Государственного задания №075-03-2025-458 от 17.01.2025 года.</funding-statement><funding-statement xml:lang="en">The work that resulted in this article was carried out as part of State Assignment No. 075-03-2025-458 dated January 17, 2025.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Faraj K., Khaled M., Faraj J., Hachem F., Castelain C. 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