kaz44Вестник Университета Шакарима. Серия технические наукиBulletin of Shakarim University. Technical Sciences2788-79953006-0524«Шәкәрім университеті» КеАҚ10.53360/2788-7995-2025-2(18)-52kaz44-1866Research ArticleТЕХНИЧЕСКАЯ ФИЗИКА И ТЕПЛОЭНЕРГЕТИКАИССЛЕДОВАНИЕ ТЕПЛОФИЗИЧЕСКИХ СВОЙСТВ НАНОЖИДКОСТИ AL₂O₃ НА ОСНОВЕ СМЕСИ ЭТИЛЕНГЛИКОЛЯ И ВОДЫ (40:60) ДЛЯ ГЕОТЕРМАЛЬНОГО ПРИМЕНЕНИЯSTUDY OF THERMOPHYSICAL PROPERTIES OF AL2O3-EG:WATER NANOFLUID FOR GEOTHERMAL APPLICATIONҚұсаинА. К.KusainA. K.

Альмира Қаирболатқызы Құсаин – магистрант образовательной программы 7М07101 «Теплоэнергетика» кафедры «Техническая физика и теплоэнергетика»,

071412, г. Семей, ул. Глинки, 20 А

Almira Kairbolatkyzy Kusain – Master's student of the 7M07101 «Heat Power Engineering»educational program, Department of «Technical Physics and Heat Power Engineering»,

071412, Semey, st. Glinka, 20A

olmeera853@gmail.comhttps://orcid.org/0000-0002-1983-6508КасымовА. Б.KassymovA. B.

Аскар Багдатович Касымов – PhD, Член Правления-Проректор по стратегии и социальному развитию,

071412, г. Семей, ул. Глинки, 20 А

Askar Bagdatovich Kassymov – PhD, Member of the Board – Vice-Rector for Strategy and SocialDevelopment,

071412, Semey, st. Glinka, 20A

askar.kassymov@shakarim.kzШәкәрім университетКазахстанShakarim UniversityKazakhstan20250807202502(18)421426Copyright © Құсаин А.К., Касымов А.Б., 20252025Құсаин А.К., Касымов А.Б.Kusain A.K., Kassymov A.B.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://tech.vestnik.shakarim.kz/jour/article/view/1866

В данной работе представлены результаты экспериментального исследования теплофизических свойств наножидкости Al₂O₃–ЭГ:вода в контексте ее применения в геотермальных тепловых насосах. Эксперимент проводился при температурах от 0 до 10 °C и концентрациях наночастиц 1, 3 и 5 об.%. Измерения показали, что при концентрации 1 об.% теплопроводность увеличивается на 8,2%, при 3 об.% – на 17,4%, а при 5 об.% – на 27% по сравнению с базовым раствором ЭГ:вода (40:60). Однако вязкость при 5 об.% возросла на 45%, что приводит к увеличению гидродинамических потерь. Оптимальная концентрация 3 об.% обеспечивает повышение теплопроводности на 17,4% при росте вязкости всего на 21%, что является компромиссом между эффективностью теплопередачи и насосными затратами. Вычисленный критерий эффективности (PEC) подтверждает, что наилучший баланс достигается при 3 об.% Al₂O₃, где PEC = 0,5. Дальнейшие исследования должны учитывать влияние наночастиц на коррозию, долговременную стабильность и взаимодействие с элементами системы. Полученные результаты могут способствовать разработке более эффективных теплоносителей для геотермального отопления и снижения энергопотребления тепловых насосов.

This work presents the results of experimental investigation of the thermophysical properties of Al₂O₃– EG:water nanofluid for its application in geothermal heat pumps. The experiment was conducted at temperatures ranging from 0 to 10 °C and nanoparticle concentrations of 1, 3, and 5 vol.%. The results showed that at 1% concentration, thermal conductivity increased by 8.2%, at 3% – by 17.4%, and at 5% – by 27%, compared to the base EG:water (60:40) solution. However, at 5% concentration, viscosity increased by 45%, leading to higher hydrodynamic losses. The optimal concentration of 3% increases thermal conductivity by 17.4% while raising viscosity by only 21%, providing a balance between heat transfer efficiency and pumping costs. The calculated performance evaluation criterion (PEC) confirms that the best balance is achieved at 3% Al₂O₃, where PEC = 1.23. Further research should investigate the impact of nanoparticles on corrosion, long-term stability, and interaction with system components. The obtained results may contribute to the development of more efficient heat transfer fluids for geothermal heating and reduction of energy consumption in heat pumps.

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The authors declare that there are no conflicts of interest present.