FORECASTING THE PRODUCTIVITY OF CLUSTERS HEAT EXCHANGERS FOR GEOTHERMAL HEAT HIGH POWER PUMPS

A technical solution for setting up an alternative energy source by using the heat of the near-surface layers of the earth's crust by placing vertical geothermal probes, which form cluster heat exchangers for high-capacity heat pump installations, is proposed. According to the results of the analysis of the existing methods of determining the potential productivity of geothermal heat exchangers, the method of installing a test geothermal probe or a group of them on the construction site with the subsequent "thermal response test" (TRT) was chosen as the most reliable in the long term. The design of the geothermal probe and the technological scheme of the installation for field tests were developed, the research parameters were determined. According to their results, graphical dependences of the change in the average temperature of the coolant during the test period for each of the 4 probes of the proposed heat exchanger were constructed. Their analysis demonstrated the presence of a partial thermal effect of the probes on each other. In our opinion, this effect is caused by the movement of water in the soil layer due to filtration. The main interest of the research is conducting multi-year modeling to accurately determine the temperature of the extraction fluid for a given sequence of heating and cooling loads on a geothermal heat exchanger. In this study, modeling by the method of aggregation of heat loads was performed in the software product Earth Energy Designer 4.0, which demonstrated a high level of accuracy in calculations for very long periods (>50 years) and with an absolute error of the value of the average temperature of the heat carrier of 0.039 K. Based on the calculation of energy consumption of a separate building and drawing up an energy balance, one of the possible ideas for maintaining operational efficiency in conditions of sustainable development is the installation of a hybrid source of heat energy, which is built on a combination of geothermal and air heat pump installations.