METHODOLOGY FOR DETERMINING THE DEPTH OF TEMPERATURE WAVE PROPAGATION IN THE CONSTRUCTION OF GEOTHERMAL HEAT PUMP SYSTEMS

• Дата: 2024
• Автори: Zurian, O., Oleynichenko , V.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Institute of Renewable Energy National Academy of Sciences of Ukraine 2024
• Теми: geothermal energy; mathematical modelling; heat wave.
• Онлайн доступ: https://ve.org.ua/index.php/journal/article/view/492
• Назва журналу: Vidnovluvana energetika

The peculiarity of the geothermal heat extraction system is the combination of technical and natural elements of such systems, while the natural object of research is located in the deep layers of the Earth, which are inaccessible for study and observation. In such circumstances, mathematical methods are almost the only method for studying thermal and hydrodynamic processes in the deep layers of the Earth. The main one is mathematical modelling. It is known that soil temperature has a daily and annual periodicity. The degree of soil heating depends on its thermal conductivity, which is the ability of the soil to conduct heat from more heated layers to less heated layers. And the course of soil temperature can significantly depend on the moisture content and vegetation cover of the soil, its nature and height throughout the year. At the same time, heat exchanger-soil systems remain insufficiently studied, the efficiency of which directly depends on the temperature distribution in the soil and the factors that affect this distribution. The basic mathematical apparatus for describing such processes includes differential equations that take into account the dependence of temperature on time and spatial coordinates. This approach allows us to estimate how solar heating of the surface causes heat waves to propagate down into the soil. The purpose of this study is to substantiate the initial data of temperature wave propagation, to substantiate a simplified methodology for determining the heat wave propagation and to calculate the depths of temperature wave propagation depending on the type of bent, humidity and vegetation cover on the surface. The work was performed in accordance with the research plan of the Institute of Renewable Energy of the National Academy of Sciences of Ukraine.