Detta är en Uppsats för yrkesexamina på grundnivå från Mälardalens högskola/Akademin för ekonomi, samhälle och teknik; Mälardalens högskola/Akademin för ekonomi, samhälle och teknik; Mälardalens högskola/Akademin för ekonomi, samhälle och teknik

Sammanfattning: Through calculations as well as a literature study the purpose of this work was to apply modern energy efficiency measures on an old existing building and on the same time take economical aspects and thermal inside climate into account. The work also carries out a case study on the existing building Lådberga 1:78. The calculations that has been carried out acknowledges a change of the building’s thermal transmittance for each measure that has been simulated as well as a change of the buildings active heating. In order to carry out the comparison between the buildings active heating, before and after applying the modern building measures, the buildings current energy consumption was calculated.  To examine the proposed actions from an economical point of view, the payback method was used. When applying actions that include additional interior insulation, diffusion calculations was used. The energy efficiency action that was calculated to be most financially viable for the building was exchange of the heat system. This action included a change from an existing pellet boiler to a more efficient geothermal heat pump as well as the exchange of four radiators.  The second-best alternative was to add insulation to the attic. Also, one simple yet effective action that could be done in the building to improve the thermal inside climate was to mount sealing stripes around the existing windows. The energy efficiency actions that was found to be least financially viable was exchange of windows, doors as well as adding insulation to the walls. Calculations was carried out through derivatives that has been acknowledged for during the current study. The results that has been reported has been chosen regarding the general understanding of the study as well as the relevance it has on the final results in order to clearly answer the questions at issue. Keywords:   Energy efficiency, active heating, passive heating, transmission, total heat loss, building technics, diffusion, solar heat gain.

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