Fejans vandrarhem – En studie om isolering och uppvärmningsalternativ

Sammanfattning: During the last decennium climate issues have become more and more important. Many steps towards an adaption of efficient energy supply systems have been taken all around the world. These steps have been created to ensure the next generation’s energy demand. In EU and Sweden objectives have been set to ensure that the energy consumption decreases by 20% year 2020 and by 50% year 2050 compared with the energy consumption levels of year 1995. The household sector stands for 40% of the total energy consumption in EU and it is therefore important to take measurements to decrease the energy consumption within this sector and to ensure that the objectives are reached.   The job initiator of this project is Skärgårdsstiftelsen in Sweden. Skärgårdsstiftelsen is part of a project on EU level, called Green Island project, which purpose is to create ”greener” environments in the archipelago region of Sweden, Estonia and Finland. One example among others of how this will be achieved by Skärgårdsstiftelsen is the analysis of energy consumption in owned buildings.   Fejans hostel which is an old building built 1892 is part of the Green Island project. The building itself has an inadequate building shell and direct acting electric radiators are currently installed as heating system. These factors lead to high energy costs. Our mission is to analyze which measurements can be taken to increase the hostels energy efficiency. A study visit together with Skärgårdsstiftelsen has been made to the Island where Fejans hostel is located. The visit showed that the windows and the outer walls are the most critical areas which should be investigated while the replacement of the heating system should also be analyzed.   A literature study has been conducted to describe which appropriate methods and materials should be considered when increasing the hostels energy efficiency. The most appropriate methods have then been modeled in a simulation program called Designbuilder where the energy consumption is calculated. The appropriate methods will then be analyzed in a payback calculus and Life Cycle Cost calculus.   The study shows that to preserve the building and its cultural value it is preferable with an insulation of the outer walls combined with window restoration. Among the measures analyzed there is only two measures with a payback time within its lifespan based on yearly heating demand, the measures are window restoration and window restoration combined with 100mm wall insulation. A geothermal heating system would further increase the energy efficiency of the building. However this option will lead to a higher investment cost which without other measures of increased income will lead to an even higher negative net present value and a payback period which is longer than the investments appreciated lifespan.