Energieffektivisering av gamla herrgården vid Forsmarks bruk : En studie med hänsyn till byggnadens kulturhistoriska värden

Sammanfattning: Reducing energy use in buildings requires extensive action regarding energy effectivization in both modern and old buildings.The old mansion in Forsmark was established 250 years ago and is a building in need of energy effectivization in order to reduce its energy consumption, hence ensuring it’s continued use. In applying said measures special attention must be given to the mansions care requirements. These requirements are governed by the mansions heritage regulations which were established by the National Heritage Board in Uppsala 1975 in collaboration with the former owner Count Ludvig af Ugglas. The requirements clearly state which parts of the building that are to remain unchanged. This study presents how identification and and measurement of the mansion were conducted in order to validate an energy simulation model of the building, how to apply these measures as well as to see if they are economically feasible. It is of importance in this study to map the mansion in order to determine if possible measures can be adapted in order to accommodate its heritage regulations. Difficulties in validating the nominal energy simulation models with measured data have resulted in the conclusion that the mapping has too many uncertain parameters which themselves have an effect on the mansions energy use. The nominal model, based on measured data and U-values assumed for each part of the mansion, gives a value that is double the measured effect acquired from the buildings heating system. The measured effect acquired from the manors heating system was significantly lower than what is to be expected in such an old building. Consequently a sensitivity analysis of the building’s U-values regarding its exterior walls and foundation was conducted. The results of the sensitivity analysis indicated that uncertainty first and foremost in wall material and construction effect the energy use of the mansion, but also that additional parameters were probable to have an impact on the mansion’s energy use. The conclusion of this study is that the old mansion at Forsmark has a relatively low energy use regarding its size, age and that it is possible to take action in order to reduce its energy use. The first of which is to adjust the heating system as it has been discovered that it is incorrectly dimensioned.