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Problem to success of excess energy at geothermal well ÆR3

Meistaravarnir Vélaverkfræði  

  • 2.6.2017, 10:00 - 12:00

Verkefni: Problem to success of excess energy at geothermal well ÆR3

Nemandi: Olaf Garðar Garðarsson

Leiðbeinendur: Einar Jón Ásbjörnsson og  Indriði Sævar Ríkharðsson Háskólinn í Reykjavík

Meðleiðbeinandi: Kristján Þórhallur Halldórsson Hitaveita Öxarfjarðar.

Prófdómari: María Sigríður Guðjónsdóttir.

Abstract: The district heating company Hitaveita Öxarfjarðarhérðas is getting to hot water out of their well at around 116°c and is looking for solutions on what to do with this excess energy. The company is paying high electric bills to cool down the water with external heat exchangers and is looking for a less expensive solution.

Few methods are available either to harvest the energy or look for a less expensive option. By harvesting the energy it is possible to send the hot water forward to the costumer where it will be cooled closer to cold water sources or to produce electricity with an ORC system, Organic Rankine Cycle. The technology behind ORC is not new but the popularity of the solution is increasing and has become more visible over past years.

The ideas put forward must consider that the well is located on a site where there is low availability of cold water and electricity for cooling is an expensive solution. It is a possibility to get cold water from a well located 9,5 km away that would not need to be pumped.

But that water could not be mixed with the well water since it contains many minerals that might fall out.

The company has been having problems with corrosion when the well water gets into contact with oxygen along with scaling when the water gets exposed to sudden pressure drop. For this reason it was tried to find a solution that would consider these properties of the water and try to keep the water in a closed system.

The results show it is possible to improve the current setup without taking a big step into other expensive solutions and give more time to collect more data about the well performance.

With more data it would be easier to estimate how much an ORC unit could produce of electricity. It is a plausible solution to lengthen the pipeline although since it becomes so long it will need an additional pump to get the water from the well to the pump house. Last option would be to send the water at this temperature forward but plastic is not an optional material in a pipeline carrying this hot water. The pipeline would have to be completely out of steel.


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