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This paper analyzes the possibility of using the thermal energy of discharged environmentally friendly mine water for the heat supply of a selected locality. There are few cases of industrial use of geothermal water in the Czech Republic, but mine water has never been the source. Based on this fact, an analysis of the usability of mine water at the Rožná I Mine was carried out. The analysis showed that the energy output of this pumped water was sufficient for the selected location of the municipality of Dolní Rožínka, where long-term annual average consumptions are at a level of 4350 GJ. The theoretical maximum output of this source is calculated as 837.4 kW; therefore, it exceeds the output required to satisfy the energy needs of this location several times over. Based on this input information, a technical and economic model of the heating system installation project was developed with three options. The case study aimed to find and propose an optimal alternative solution to replace the current unsatisfactory state of heat supply in the village of Dolní Rožínka. In the final part of this paper, the most optimal option is identified by a comparative method, which replaces the existing central district heating based on the production of heat energy from natural gas, i.e., fossil fuels. This study was motivated by a strategy to replace fossil energy sources with renewable energy sources wherever conditions are suitable.

In most countries, the gas sector is one of the sectors that have a significant impact on the state energy security. After the collapse of the Soviet Union and after the changes of communist rule, the Czech Republic as well as Ukraine began their own battle for energy independence. After political and economic revolution, there was a long and difficult journey which had both positive and negative consequences for the development of the countries. Natural gas consumption in Ukraine amounted to almost 114.95 billion cubic meters in 1991, while in the Czech Republic it was near 5.9 billion cubic meters. [2,4] Accordingly, gas consumption per person reached circa 2.2 thousand cubic meters per year in Ukraine, and 0.57 thousand cubic meters per year in the Czech Republic. Currently, Ukraine has a significant advantage in gas reserves and capacity of underground gas storages. According to the official data, the total gas reserves in Ukraine are about 1050 billion cubic meters, while in the Czech Republic only 4.73 billion cubic meters.

The largest been realized installations of heat pumps in the Czech Republic, where the primary collector of low-potential heat is formed deep wells, is heating complex building of new Auditorium and CIT in campus of VSB Technical University of Ostrava. This building represents two independent functional units (Auditorium with side halls and Information Technology Centre - CIT) with a total floor area of 9234 m2. The original project planned compound heating using district heating as a primary source of heat. Heating the object itself is a combination of floor heating systems and hot-air heaters. During project preparation has changed the project heating and a modern, technically unique and highly cost-effective solution has been designed with heat pump (type rock-water). Currently building heats 10 heat pumps with a total output of 700 kW through 110 wells with a depth of 130 m each. To assess the proportions of individual internal and external sources to the overall heat balance, the verification of systems designed for long-term monitoring of the behaviour of the rock massive around the energy used wells and energy storage options have been proposed and gradually implemented two research measuring polygons. They are located in the area of energy utilized wells. Each of the monitoring wells is instrumented with sensors at a certain depth. This article discusses the implementation of research polygons on experience with the excavation of wells using temperature sensors, a data acquisition system and finally outlines the possibilities of evaluating the measurement data.