Kartläggning av energianvändning under byggfasen vid nyproduktion av flerbostadshus

Sammanfattning: The energy consumption in the sectors of residential and public buildings is 40 % of the total energy consumption in Sweden. The main part, 85 %, of the energy use in these sectors is for operation of the buildings. The rest is used in the building process. When energy-efficiency measures are taken the energy use during the operation time decreases and the fraction of energy consumption during the building time increases. This project is carried out in cooperation with JM AB and concerns the energy use during the building time of production of blocks of flats at the building site. The main part of the electricity that is used during the production of apartment buildings goes into the heating of portacabins and illumination of the building during the construction phase. These together use about 70 % of the total energy during the building phase. The rest is used by cranes, containers, fan heaters, tools etc. The dominant part of the energy, 98 %, used only for production (portacabins excluded) is used during the frame construction, fit out and finishing work. The simulations performed in this study show that the amount of energy needed to heat the cabins can be reduced by 54 % in the short term by insulating the cabins towards the ground and between the cabins. Increasing the insulation in the construction of the cabins combined with better regulating systems for inside temperature would reduce the energy use by 70 %. The most profitable measure is the use of low-energy lamps instead of bulbs which decreases energy consumption for lighting by 82 %. In the long term it is expected that the suggested measures could decrease the use of electicity for construction of buildings by 44 %. Tryckt av: