Geothermal Exchange System, Basque Country, Spain
Results and impacts
Start Date: 2010
End Date: 2010
Cumulative investment made by
stakeholders in sustainable energy: 774
Economic savings: 101 kEuro/year
Operational costs: 98 kEuro/year
Simple payback time: 5.8 year
Renewable energy capacity installed p.a.:
Energy savings electricity: 300 MWh/year
Energy savings heat p.a.: 1,200 MWh/year
Primary energy savings: 129 toe/year
Reductions of greenhouse gas emissions: 452 t CO2e/year
Aims and objectives of this sustainable energy action
The most immediate goal is to reduce consumption of fossil fuels in a existing building which needed to be refurbished. The alternative system for the geothermal exchange system would be a fuel oil boiler for heating and an air-water heat pump for cooling. The geothermal system also uses the conventional generation for support, to give only the 15% of the total energy demanded by the building.
Technical and financial implementation
The system has a geothermal exchange capacity of 557 kW for heating and 519 kW for cooling, respectively 52% and 41% of
the peak load. It covers 89% of the heating and warm sanitary water needs (1.152 MWh/year) and 80% of the cooling needs
(775 MWh/year). The geothermal circuit has 9,400 linear metres and it is placed below gardens and pavement.
- 2009: First contact and feasibility study.
- 2010: Carrying out pilot survey and TRT. Redesign of the system. Final project design. Planning of works.
Completion of works and commissioning of the installation by the end of the year.
- When promoting geoexchange based heat pumps, it is difficult to convince the technical managers about the advantages of the technology due to the lack of experience. However, facilities of this type are becoming more frequent and the barrier associated with the promotion of a new technology is slowly being outcome.
- The lack of knowledge on the technology in our country and the lack of specialized companies is solved through information and education seminars organized by the Administration. Also, a public-private partnership has been created to provide services in this area.
- The initial investment is higher than a conventional system, although they are amortized over a discrete period of time. Grants help to reduce the initial capital requirements.
How this action could be replicated
This good practice would be replicable in a less costly way in those countries where this technology is more developed,
because they would not have to overcome the lack of knowledge and implementation that this region had in the beginning
of this project.
In addition, it is important to convince the promoters of new buildings or refurbishing old ones about the advantages of the use of this energy and its amortization over a short period of time in a context of high energy prices.
This project is based on an agreement between the University of Deusto and EVE by which EVE subsidizes part of the geothermal installation in one of the buildings of the University, in the process of rehabilitation.