Ytterväggars energiflexibilitet och klimatpåverkan : En jämförande studie

Sammanfattning

The transition to renewable energy for heating of buildings is limited due to load peaks during the heating season which also requires fossil energy during peak hours. Increased energy flexibility by utilizing building thermal mass is considered as a cost-effective solution to this problem by storing energy from off-peak hours to be used during peak hours. This study evaluates how five different types of external walls (concrete, lightweight concrete, light expanded clay aggregate, cross laminated timber and wooden frame) enables energy flexibility by simulating the thermal autonomy for a multi-storey building depending on U-value and climate conditions in Sweden, while also considering their environmental impact from the production process through a life cycle assessment during stage A1-A3. The result shows that a concrete wall has the biggest flexible potential and wooden frame the lowest, while there is no significant difference between the rest. Considering the combination of the actual required thermal autonomy, in this case 15 hours, and environmental impact for each case, walls of cross laminated timber and wooden frame can be seen as the overall best option for southern Sweden. Despite the biggest environmental impact, concrete can be seen as the best option for northern Sweden.