Energieffektivisering av ett uppvärmningssystem vid två sameskolor i Karesuando, Norrbotten
Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
Specialfastigheter Sweden AB manages two properties in Karesuando, Norrbotten. The properties are used as Sami schools with children from kindergarten to sixth grade. The properties have a heating system that consists of two oil-fired boilers and a number of water heaters that supplies heat in the form of a warm water heating system. These boilers are located in separated buildings, in event of a stop on one single oil-fired boiler, can in the worst scenario only one oil-fired boiler supply both buildings. This is neither sustainable nor an energy -efficient solution.
An energy- efficient solution to this problem is required to reduce its dependence on oil and the high cost of both transportation and purchasing. The best option that applies to these properties is to convert the current oil-fired boilers to a geothermal heating system when a connection to the district heating or solid fuel boiler is not an option. The purpose of this work is to find alternative energy efficient solutions for replacement of a fossil fuel heating system and reduce the heating costs for two Sami Scholes in Karesuando, Norrbotten.
By calculating the properties total thermal energy losses in the form of heat, using different heat resistance, thermal transmittance and transmission losses, resulted to a energy loss of 217 500 kWh/year. With this information, the dimensioning of the geothermal heating system six main parts could begin. These parts are dimensioning of the drill hole, heat pump, additional heating, water heater, heat emission system or so called radiators, and at last the electric service line.
The geothermal heating system is calculated to cover 60-70 % of the property's maximum heat demand, which result to cover approximately 90% of the property’s annual heat demand. The remaining 30-40 % is additional heating.
An renewed heating system with a geothermal heat pump size of 72 kW and additional heating at 27 kW, giving an annual reduction of heat costs at 162 000 SEK and an annual profit of 111 000 SEK in comparison with the oil-fired boilers heating system.
Place, publisher, year, edition, pages
2013. , 63 p.
IdentifiersURN: urn:nbn:se:umu:diva-79451OAI: oai:DiVA.org:umu-79451DiVA: diva2:641730
Specialfastigheter Sverige AB
Subject / course
Bachelor of Science Programme in Energy Engineering
Östin, Ronny, Universitetslektor
Soleimani-Mohseni, Mohsen, Universitetslektor