Jämförelse mellan hybridelement och halvsandwichelement

Sammanfattning: To consider the climate and strive to reduce greenhouse gas emissions is a current issue in today's society. The outer wall hybrid sandwich wall is a new, more environmentally friendly wall type that is being researched for use in the market. The purpose of this study is to analyze whether the hybrid sandwich wall is a better choice for future construction projects and to compare it to the semi-sandwich wall. The study is limited to examining LCA module A (A1-A5) and module C (C1-C4), as well as how the pile foundation is affected by the use of the hybrid sandwich wall. To conduct this investigation, literature studies, quantitative, and qualitative methods were used. The quantitative method involved climate calculations performed both manually and using the Bidcon and BM Tools software. With the assistance of the company Sigma Civil, a reference project was provided where the hybrid element could be tested. The qualitative method consisted of an interview study with Håkan Arnebrant, Sales Development Manager at Metsä Wood, who works with Kerto LVL and has background information on the hybrid sandwich wall. The software used to conduct the study was FEM-Design for load calculations, BM and Bidcon for LCA analysis. The results of the study showed that the LCA analysis of module A indicated a reduction in carbon dioxide emissions by 28 000 kg Co2e when using the hybrid sandwich wall. For module C, emissions decreased by 1 000 kg Co2e. Additionally, during the element exchange, the self-weight of the outer wall decreased by 1,8 MN, which corresponded to the replacement of only six out of the total 27 piles along the facade with RD140. This resulted in a reduction of carbon dioxide emissions by only 1 600 kg Co2e for module A and 20 kg Co2e for module C. The cost savings for piles after the element exchange amounted to 15 600 SEK, and the total cost savings for the entire building during the element exchange were 235 000 SEK. Despite this, the hybrid sandwich wall also contributed to a 9% lower energy consumption. However, in conclusion, the hybrid element is considered a better, more environmentally friendly alternative for future construction projects.