ACCOUNTING OF THE TEMPERATURE DEVIATION AT THE WATER-SOIL BOUNDARY OF AN OPEN BODY OF WATER IN THE CONSTRUCTION OF HYDROTHERMAL HEAT PUMP SYSTEMS

• Дата: 2024
• Автор: Zurian , O.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Institute of Renewable Energy National Academy of Sciences of Ukraine 2024
• Теми: heat pump; soil storage; heat supply; conversion factor; periodicity; freezing layer.; гідросфера; відкрита водойма; тепловий насос; гідротермальна система; енергоефективність.
• Онлайн доступ: https://ve.org.ua/index.php/journal/article/view/449
• Назва журналу: Vidnovluvana energetika

In the process of solving the tasks of extracting low-potential environmental heat from open bodies of water when using heat pump systems with collectors immersed in the body of water, there is a need to obtain information about the depth of temperature changes in the body of water, which determines the layer of water that actively interacts with the Earth’s atmosphere. In the cold season, the temperature in it drops, and in the warm season it rises. It is known that the efficiency of the heat pump system depends on both the temperature difference at the outlet of the heat pump condenser and the inlet to its evaporator, and the stability of the temperature of the heat energy source. The temperature at the inlet to the heat pump evaporator is determined by the temperature of the medium at the place of installation of the thermal energy collector. And taking into account the fact that the collector of the hydrothermal system usually sinks to the bottom of the reservoir, the task of determining not so much the change in water temperature in the reservoir itself as the temperature at the water-soil boundary, at the bottom of the reservoir, that is, the study of thermo physical processes occurring in water under the influence of both exogenous and and endogenous factors. The main feature of the hydrothermal thermal energy production system is the combination of technical and natural elements of such systems. At the same time, the natural source of thermal energy is located in an environment that is not easily accessible for observation. The paper provides a description of the developed experimental hydrothermal heat pump system and the research methodology. Field studies were conducted to analyze the influence of bottom heat flows on the daily regime of a small open water body. Changes in the temperature of water and the bottom of open water bodies in the city where the experimental system is located are practically determined. It is shown that as a result of taking into account the heat exchange with the bottom, the temperature at the depth of the reservoir increases and decreases near the surface. This leads to an increase in the turbulent flow from the atmosphere and a decrease in heat output due to long-wave radiation, as a result of which the average temperature of the reservoir increases. The mathematical apparatus for analytical calculation of the depth of temperature wave propagation in water during the construction of hydrothermal heat pump systems is described. The basic mathematical apparatus for describing such processes includes differential equations that take into account the dependence of temperature on time and spatial coordinates.