AP08857319 — Research on ways to increase the heat transfer characteristics of a vertical type borehole soil heat exchanger to ensure high productivity of heat pumps

The goal of the project is to study a heat transfer enhancement mechanisms of borehole heat exchangers to increase the heat pump performance and develop recommendations. The recommendations will be based on measurements of the ground source heat pump, on fluid dynamics and heat transfer calculations using licensed software and own algorithms.

Relevance of the project: The building sector is one of the largest consumers of energy and a major source of greenhouse gas emissions, which is particularly critical for large cities in Kazakhstan with high levels of air pollution. The use of conventional energy sources for heating and hot water supply exacerbates environmental and public health issues. Therefore, the development and implementation of energy-efficient and environmentally friendly technologies, such as ground-source heat pumps, is highly relevant.

Scientific supervisor: PhD doctor, Yerzhan Belyayev

Results obtained: As a result of the research, a solar ground-source heat pump with a vertical borehole heat exchanger was developed and experimentally validated under the climatic conditions of Almaty and Astana. Advanced 3D numerical models of heat and mass transfer and fluid dynamics were created and verified using experimental data, enabling detailed analysis of system performance. Experimental studies demonstrated that the system achieves a coefficient of performance (COP) in the range of 2.11–2.76, confirming its energy efficiency. Practical recommendations for system design, installation, and operation were developed, including seasonal thermal energy storage in the ground. A techno-economic analysis showed the competitiveness of the technology under favorable conditions such as subsidies and reduced drilling costs. The obtained results demonstrate high scientific novelty and strong potential for practical implementation in heat supply systems.

List of publications with links to them

1. Toleukhanov A., Belyayev Ye., Amanzholov T., Seitov A., Aliuly A., Yerdesh Ye., Mohanraj M., Singh R.M. Thermal performance calculation of solar assisted ground source heat pump // Proceedings of the Fourth International Scientific Conference Alternative Energy Sources, Materials & Technologies (AESMT’21). – Ruse, Bulgaria, 2021. – Vol. 3. – P. 9–10. – URL: https://www.aesmt.lima-city.de/Home_AESMT_21.html
2. Әлиұлы А., Толеуханов А.Е., Беляев Е.К., Калтаев А. Моделирование тепловых процессов солнечного водонагревателя // Сатпаевские чтения. – 2021. – Т. 2. – С. 120–123. – URL: https://official.satbayev.university/ru/materialy-satpaevskikh-chteniy
3. Беляев Е.К., Толеуханов А.Е., Аманжолов Т.Е., Калтаев А. Солнечный грунтовой тепловой насос для теплоснабжения в континентальных климатических условиях // Сатпаевские чтения. – 2021. – Т. 2. – С. 124–127. – URL: https://official.satbayev.university/ru/materialy-satpaevskikh-chteniy
4. Ердеш Е.Б., Беляев Е.К., Толеуханов А.Е., Калтаев А. Оценка производительности теплового насоса «Вода–Вода» // Сатпаевские чтения. – 2021. – Т. 2. – С. 127–131. – URL: https://official.satbayev.university/ru/materialy-satpaevskikh-chteniy
5. Сейтов А., Беляев Е.К., Толеуханов А.Е., Тунгатарова М.С. Численный анализ теплопередачи в системе хранения скрытой теплоты с уплотненным слоем // Сатпаевские чтения. – 2021. – Т. 2. – С. 131–135. – URL: https://official.satbayev.university/ru/materialy-satpaevskikh-chteniy
6. Yang L.W., Xu R.J., Xua N., Xia Y., Zhou W.B., Yang T., Belyayev Ye., Wang H.S. Review of the advances in solar-assisted air source heat pumps for the domestic sector // Energy Conversion and Management. – 2021. – No. 247. – P. 114710. – DOI: https://doi.org/10.1016/j.enconman.2021.114710
7. Amanzholov T., Seitov A., Aliuly A., Yerdesh Ye., Mohanraj M., Botella O., Feidt M., Wang H.S., Belyayev Ye., Toleukhanov A. Thermal response measurement and performance evaluation of borehole heat exchangers in Kazakhstan // Energies. – 2022.
8. Yerdesh Ye., Amanzholov T., Aliuly A., Seitov A., Toleukhanov A., Mohanraj M., Botella O., Feidt M., Wang H.S., Tsoy A., Belyayev Ye. Experimental and theoretical investigations of ground source heat pump system: a case study in Kazakhstan // Energies. – 2022.
9. Беляев Е.К., Толеуханов А.Е., Ердеш Е.Б., Аманжолов Т.Е., Алиулы А., Сейтов А. Солнечный грунтовой тепловой насос с возможностью восстановления теплофизических свойств грунта // Заявка на патент на изобретение РК. – № 2022/0680.1 от 28.10.2022.
10. Yerdesh Ye., Toleukhanov A., Mohanraj M., Wang H.S., Botella O., Feidt M., Belyayev Ye. Air-to-Water Cascade Heat Pump Thermal Performance Modelling for Continental Climate Regions // Entropie thermodynamique – énergie – environnement – économie. – 2022. – Vol. 3. – P. 1–16. – DOI: https://doi.org/10.21494/ISTE.OP.2022.0836
11. Amanzholov T., Belyayev Ye., Mohanraj M., Toleukhanov A. Study of borehole heat exchanger heat transfer enhancement parameters // Journal of Mathematics, Mechanics, and Computer Science. – 2022. – Vol. 115, No. 3. – P. 65–77. – DOI: https://doi.org/10.26577/JMMCS.2022.v115.i3.07