This study investigates the status and potential of the low temperature district heating system in Lyckebo, focusing on the distribution losses in the culvert system and in the heat exchangers. The Lyckebo system was built in the 1980’s as a test system with heating from a solar field and an electrical boiler. The unique features with this system were a cavern for storage of excess heat combined with a low temperature system. Today, the solar field has been substituted with two pellet boilers, but the cavern is still in service. Low temperature district heating systems are built in order to lower the losses, due to a smaller temperature difference between the medium in the culvert and the soil. This technology is used in newly built energy efficient residential areas, which makes it interesting to investigate the status of a system that was built in the 1980’s, in comparison to the possibilities of low temperature systems today. A simulation model has been developed to calculate the theoretical losses in the culvert system with production data from 2013. The total instantaneous losses in the culvert system were between 210- 280 kW and the highest losses in can be found in the secondary system. There are heat exchangers in the system that has a return temperature of approximately 8°C lower than the return temperature in the system, which leads to the conclusion that many of the exchangers in the system probably have poor energy utilization.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-253800 |
| Date | January 2015 |
| Creators | Bergensund, Andreas, Eriksson, Pontus, Häger, Oskar |
| Publisher | Uppsala universitet, Institutionen för teknikvetenskaper, Uppsala universitet, Institutionen för teknikvetenskaper, Uppsala universitet, Institutionen för teknikvetenskaper |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | TVE ; 15 022 maj |
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