Multifunctional building parts to increase the use of solar thermal heat in residential buildings – Mechanisms, saving potentials and application under real conditions. (1st July 2022)

• Record Type: Journal Article
• Authors: Gauer, Tillman; Pahn, Matthias
• Is Part Of: Journal of building engineering. Volume 51(2022)
• Publication Date: 2022-07-01
• Subjects: Multifunctional precast building elements of concrete -- Thermally activated building system -- TABS -- Thermal building envelope -- Heat storage technologies -- SmallHouse IV; eHP Electric heat pump -- GHG Greenhouse gas -- MBP Multifunctional building part -- RE Renewable energy -- ST Solar thermal collector -- TABS Thermally activated building system -- PMV Predictive mean vote -- SPF Seasonal performance factor -- PHPP Passive house; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2022.104278
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: To reach international goals on climate protection, greenhouse gas emissions (GHG) of the building sector must be reduced significantly. Besides further insulation, renewable heat must be used, which require storage to utilise fluctuating heat generation. This storage can be gained by integrating thermal activations into solid external walls and thus converting them into multifunctional building parts (MBP). Using MBP as part of a heating system of a single-family dwelling in a temperate climate to store solar heat reduces the demand for net energy by 25% and increases thermal comfort. These energy savings can be found during the whole heating period and are based on the more efficient and extensive utilisation of solar radiation. The heat generated is mainly stored in the MBPs. In addition, the use of external building components also leads to a reduction of the residual heat demand due to the elimination of transmission losses. Those account for about 20–25% of the savings found. In conclusion, the concept is compared to other building concepts and shows that the MFB lead to similar results as using a buffer storage of 3 m³ and is beneficial compared to the passive house concept. Graphical abstract: Image 1 Highlights: External walls can be used as thermal storage by using thermal activations. In combination with solar heat, ab.25% of electric energy can be saved. 72 m 2 of external wall saves as much electric energy as a 3 m³ buffer storage. Similar savings achievable alike passive house and 'Sonnenhaus' concept.