Abstract
Energy saving ordinances requires that buildings must be designed in such a way that the heat transfer surface including the joints is permanently air impermeable. The prefabricated roof and wall panels in lightweight steel constructions are airtight in the area of the steel covering layers. The sealing of the panel joints contributes to fulfil the comprehensive requirements for an airtight building envelope. To improve the airtightness of steel sandwich panels, additional sealing tapes can be installed in the panel joint. The influence of these sealing tapes was evaluated by measurements carried out by the RWTH Aachen University - Sustainable Metal Building Envelopes. Different installation situations were evaluated by carrying out airtightness tests for different joint distances. In addition, the influence on the heat transfer coefficient was also evaluated using the Finite Element Method (FEM). The combination of obtained air volume flow and transmission losses enables to create an "effective heat transfer coefficient" due to transmission and infiltration. This summarizes both effects in one value and is particularly helpful for approximate calculations on energy efficiency.
Highlights
Energy efficient construction has become increasingly important in recent years
The sealing of the component joints contributes to continuing the sealing levels across element and construction section boundaries and fulfilling the comprehensive requirement of the Energy Saving Ordinance for an airtight building envelope
The sandwich panel is examined by means of the Finite Element Method (FEM)
Summary
Energy efficient construction has become increasingly important in recent years. In particular, the requirements for thermal insulation and airtightness of roof and wall systems have a significant impact on the design and execution of building envelopes in lightweight metal construction. In addition to minimizing heat transmission, the airtightness of the building envelope is an essential property for creating energy-efficient and physically perfect buildings. The German Energy Saving Ordinance stipulates "buildings to be constructed must be designed in such a way that the heat transfer surface, including joints, is permanently air-impermeable in accordance with the generally accepted rules of technology". The requirement for airtight building envelopes should help to avoid unnecessary heat transfer and structural damage. The sealing of the component joints contributes to continuing the sealing levels across element and construction section boundaries and fulfilling the comprehensive requirement of the Energy Saving Ordinance for an airtight building envelope. An “effective heat transfer coefficient” can be identify which combines the air volume flow with the transmission losses and enable rough calculations on energy efficiency for the building. The energetic and economic performance is shown for exemplary U-values and joint leakages
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