ENERGY EFFICIENCY OF THE SHALLOW AQUIFERS UTILIZATION FOR THE DISTRICT HEATING AND COOLING

• Дата: 2019
• Автори та афіліації: Yu. Morozov — Institute of Renewable Energy of the National Academy of Sciences of Ukraine 02094, Kyiv, st. Hnat Hotkevich, 20A; A. Barylo — Institute of Renewable Energy of the National Academy of Sciences of Ukraine 02094, Kyiv, st. Hnat Hotkevich, 20A; D. Chalaev — 1Institute of Renewable Energy of the National Academy of Sciences of Ukraine 02094, Kyiv, st. Hnat Hotkevich, 20A, 2Institute of Technical Thermophysics of the National Academy of Sciences of Ukraine 03057, Kyiv, st. Maria Kapnist (Zhelyabova), 2a; M. Dobrovolskyi — Institute of Technical Thermophysics of the National Academy of Sciences of Ukraine 03057, Kyiv, st. Maria Kapnist (Zhelyabova), 2a
• Ключові слова: keywords
• Автори: Morozov, Yu., Barylo, A., Chalaev, D., Dobrovolskyi, M.
• Формат: Стаття
• Мова: Українська
• Опубліковано: Institute of Renewable Energy National Academy of Sciences of Ukraine 2019
• Теми: shallow aquifers; heat pump; heat supply; cold supply; energy efficiency
• Онлайн доступ: https://ve.org.ua/index.php/journal/article/view/204
• Назва журналу: Vidnovluvana energetika

The energy efficiency of the groundwater ustilization from the shallow s to obtain heat and cold in the heating and cooling systems of residential buildings and public buildings was determined. The calculations are based on the operational data from two wells drilled on the territory of the International Renewable Energy Center. Experimental wells are located at a distance of 11.5 m from each other, the depth of which is 50 and 57 m, respectively. During the holding of the test pumping, the main preliminary operational aquifer characteristics were obtained. The static level is set at a depth of 32.0 m, the flow rate of wells is 2-3 m3/h., the initial temperature of groundwater is 12 °C. The following aquifers and complexes were discovered: the alluvial-deluvial horizon of the first above-flood terrace terrain, consisting of quartz sand with lenses and layers of loam and lying at a depth of 8 to 12 m; the aquiferous complex in the sediments of the Mezhigorskaya, Berek and Novopetrovsky formations of the Oligocene-Miocene (Poltava and Kharkiv series), which lies at a depth of 32 to 50 m and consists of fine-grained sand; Buchak-Kanev aquifer, occurring at a depth of 90 to 117 m and consisting of fine and fine-grained sand. In order to evaluate the possibility of groundwater using  for geothermal heat and cold supply, an aquifer of Poltava and Kharkiv age is used, since this horizon is isolated from surface and groundwater by a thick layer (up to 20 m) of dense clays, provides it with a permanent filtration mode and stable hydrogeological parameters. The work shows that the use of groundwater as a source of low-potential energy for heat pumps makes it possible to obtain from the well 7...10 times more thermal power compared to traditional heat pump systems based on ground probes. A scheme of operation of heat pump units with stepwise activation of the temperature potential of groundwater from +12 °С to +1 °С is proposed, which makes it possible to increase the energy efficiency of the thermal energy generation process by almost one and a half times. The effectiveness of the use of groundwater for air conditioning in the summertime has been evaluated. It is shown that for these wells, the COP value of the «passive» conditioning process exceeds 25. The temperature in the room can be reduced by 5 degrees. The amount of «cold» that can be obtained from one well is more than 10 kW. Based on the analysis of hydrogeological characteristics and filtering mode of the first aquifers from the surface, the most suitable complex for creating geothermal heat and cold supply systems was the water complex and calculations were carried out that showed the feasibility of using the aquifer in the oligoran, berek and novopetrovsky suite deposits. Ref. 3, tabl. 3, fig. 4