| Title | Utilization of Low Temperature Geothermal Systems at Dalvík, N-Iceland, and Egilsstadir and Fell, E-Iceland |
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| Authors | Svanbjörg Helga HARALDSDÓTTIR and Guðni AXELSSON |
| Year | 2015 |
| Conference | World Geothermal Congress |
| Keywords | Geothermal central heating, monitoring, evolution, low-temperature-field, temperature, pressure, drawdown, Dalvík, Hamar, Brimnesborgir, Egilsstadir, Fell, Urridavatn, Iceland |
| Abstract | The evolution of low temperature geothermal systems due to domestic utilization in two different parts of Iceland is introduced. The geothermal system at Urridavatn provides the villages Egilsstadir and Fell and their surroundings in E-Iceland with geothermal water for heating and domestic use and two separate low temperature geothermal systems, Hamar and Birnunesborgir, provide the same to Dalvík, a village in N-Iceland and the surroundings. In each of the systems two wells are the main production wells, or one well and a reserve well. These systems have been monitored for several decades, such as their production, drawdown and the temperature of the water entering the distribution systems. These geothermal systems in two different parts of the country have managed to provide sufficient geothermal water to the communities in spite of increasing needs. New wells have been drilled to meet increased needs of the customers and expanding distribution systems and group of customers. In Urridavatn the newest well was connected to the distribution system in 2007 and has with the previous main well provided sufficient water to the community at Egilsstadir-Fell and the temperature in the system has been stable from 2007. The production from Hamar provided geothermal water for Dalvík and surroundings from 1969 and in 1997 production stared at Birnunesborgir for the communities south of Dalvík. The two systems were partly joined when in 2006 the increasing needs for Dalvík were met by adding a little of the 10°C warmer water from Birnunesborgir to the water from Hamar, thereby also increasing the temperature of the water to Dalvík by 2°C and keeping the necessary flow rate. Water from Birnunesborgir has since 2007 also been used for distribution to Svarfadardalur, south and west of Dalvík. |