Project: Vitosha ART, Multifunctional Complex with Residential Units, Offices, Retail Outlets, Kindergarten, Underground Parking, and Transformer Station

Investor: Vitosha Art EOOD / Phase I: Execution Period: February 2025 – on going

Number of Boreholes: 118 boreholes at a depth of 130 m. The boreholes are executed with a geothermal heat exchanger at a depth of 130m and a borehole radius of 15cm, into which a double U-probe Rehau 4x40mm, PE RC 40 x 3.7mm, SDR11 is inserted. After lowering the probe, the heat exchanger is filled with a thin-layer, heat-conductive, sulphate-resistant concrete mixture Creteo®Inject CC 854 HS.

Drilling for geothermal energy at a depth of 130 meters is a key stage in the construction of geothermal heating and cooling systems. The initial result from the measurements taken shows an average undisturbed ground temperature of 15.16 degrees Celsius. This result indicates a high coefficient of performance for the future heat pump installation and high efficiency of heat supply, which is sufficient for effective heat extraction, making this method extremely suitable for heating and cooling buildings.

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Drilling Process

  • Drilling: The drilling is performed using drilling rigs Klemm KR806 160kW and Geotec Rotomax XL Gti.
  • Probe Installation: Once the borehole is completed, U-shaped geothermal polyethylene pipe kits (Rehau 4x40mm, PE RC 40 x 3.7mm, SDR11) are installed in the opening. Drilling to a depth of 130 meters allows the system to extract the necessary heat even in colder climatic conditions.
  • Connection to the Heating System: After the probes are installed and the borehole is cemented with geothermal sulphate-resistant thermal cement  (ROЕFIX CreteoInject CC 854HS), they are connected to the geothermal pump, which circulates fluid (usually antifreeze) through the borehole. This fluid extracts heat from the ground and transfers it to the building's heating or cooling system. 

How Does the Geothermal System Work?

The system consists of an underground heat exchanger (loop), a heat pump, and an internal distribution system. The loop is a network of pipes buried in the ground, through which a liquid circulates, absorbing heat from the soil. This heat is transferred to the heat pump, which converts and distributes it throughout the building via underfloor heating or fan coils. In the summer, the process is reversed, with heat from the building being conducted back into the ground, providing effective cooling. 

Applications in the Residential Sector:

Heating and Cooling of Premises: Ensuring a comfortable temperature throughout all seasons.

Domestic Hot Water Supply: Constant access to hot water for household needs.

Low Operating Cost: Average monthly costs for heating, cooling, and hot water are around 0.6 BGN/sq.m (VAT included). 

Advantages of Geothermal Systems:

High Energy Efficiency: Geothermal systems can reduce heating and cooling costs by up to 70% compared to traditional systems.

Eco-friendliness: The use of renewable energy from the ground reduces carbon emissions and contributes to environmental protection.

Reliability and Durability: The system's underground components have a lifespan of over 50 years, and the above-ground components around 25 years, with minimal maintenance requirements.

Flexibility: Systems can be adapted for both single-family and multi-family residential buildings, ensuring individual control and comfort.

Our Approach:

Geothron offers comprehensive solutions, including:

Individual Design: Designing systems tailored to the client's specific needs and the building's characteristics.

Professional Installation: Using high-quality materials and equipment to guarantee long-lasting and reliable operation.

Maintenance and Monitoring: Regular maintenance and monitoring of the system for optimal functioning and extended service life.

Investing in geothermal solutions not only leads to significant energy and financial savings but also increases the value and sustainability of your home.