Kartering och sammanställning av större geoenergisystem i Sverige – En studie baserad på SGUs brunnsarkiv

Abstract

Sweden is one of the leading countries in the world developing and using ground source heat pump (GSHP) technology. The Geological Survey of Sweden (SGU) is the authority in Sweden that provides open access geological data of rock, soil and groundwater for the population. All wells that are drilled must be registered in the SGU’s Well Database. It is the well driller’s and the consultants, related to the project, liability to submit registration of drilled wells, and although the tendency to register wells has improved considerably this last decade, there is still an estimation of 20 % of wells, mostly from earlier years, missing in the database.     Since 1978 a total of more than 600 000 wells (water wells, GSHP boreholes etc) have been registered in the Well Database, with around 20 000 new registrations per year. Of these wells an estimation of 320 000 wells are registered as GSHP boreholes. The vast majority of these boreholes are single boreholes for single-family houses. The number of properties with registered vertical borehole GSHP installations amounts to approximately 243 000. Of these sites between 300-350 are large GSHP systems with at least 20 boreholes. While the increase in number of new registrations for smaller homes and households has slowed down after the rapid development in the 80’s and 90’s, the larger installations for commercial and industrial buildings have increased in numbers over the last ten years.     This report uses data from SGU’s Well Database to quantify and analyze the numbers of vertical GSHP systems reported between 1973-2015, with special focus on medium sized and large systems. From the new aggregated data, conclusions can be drawn about the development of larger vertical GSHP systems installments in Sweden over the years, how the well depth and size of the system has changed, and geographical distribution in Sweden.     All the results are based on SGU’s Well Database and not from other sources and therefore discussions on error sources are given