Energihushållning och varsamhet för äldre byggnader : Chefsbostaden i Strömsholm, ett timmerhus från 1900-talets början
This report is the result of a degree project in building engineering, at an advanced level. The project evaluated a building from a technical and historical point of view, and focused on its energy consumption, particularly the energy used for heating. The building in question was a small apartment building in Strömsholm, Sweden. It was made in 1902, from vertical logs, a not so common form of the traditional log house. The goal of the project was to evaluate if the energy consumption could be reduced in accordance with building preservation regulations, that is without damaging any of the building’s cultural or historical values.
The building was surveyed with the help of archive and literature studies, interviews and inspections. Based on these findings, supplementary insulation on the inner side of the climate screen was decided on. The program IDA Indoor Climate and Energy was used to make computer simulations of the energy consumption of the building for five different alternatives of supplementary insulation. Part of the project was also to investigate whether IDA Indoor Climate and Energy was suitable for energy simulations of old buildings. The moisture balance of the outer walls was calculated manually to see if the supplemental insulation constituted a risk when it came to the moisture sensitivity of the construction.
The result of the computer simulations, combined with building physics, shows that the energy consumption for heating could be reduced, especially if the roof was to be insulated. However, these results cannot and should not be seen as anything but indications, because of the uncertainty of the input data. The data on ventilation and air flows was considered to be one of the main sources of error. Furthermore, there were signs that the design of the computer models was far from optimal. The result of the moisture calculations shows that the moisture sensitivity is indeed increased.
IDA Indoor Climate and Energy was judged as more suitable for simulations of new buildings than of old ones, due to the complexity of the latter, but the program can still be used as an aid for energy evaluations of old buildings if it is used in the right way.
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