Heat and moisture transfer in fibrous thermal insulation with tight boundaries and a dynamical boundary temperature |
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| Authors: | Uro? Leskov?ek Sa?o Medved |
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| Affiliation: | 1. TRIMO d.d., Prijatljeva 12, 8210 Trebnje, Slovenia;2. Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia;1. LGCB-LTDS, UMR 5513 CNRS, ENTPE, Université de Lyon, 3 Rue Maurice Audin, F-69518 Vaulx-en-Velin, France;2. LTDS, UMR 5513 CNRS, ENISE, Université de Lyon, 58 Rue Jean Parot, F-42023 St-Etienne, France;1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;2. Laboratory I2M, UMR 5295, CNRS, University of Bordeaux, Talence, 33400, France;3. Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai, 200093, China;1. Université de Rennes, Laboratoire de Génie Civil et Génie Mécanique, Axe Ecomatériaux pour la construction, 3 rue du Clos Courtel, BP 90422, 35704 Rennes, France;2. PROGETIC, Ramon Turró 100-104, 5-7, 08005 Barcelona, Spain;3. Department of Architecture & Civil Engineering, BRE Centre in Innovative Construction Materials, University of Bath, United Kingdom |
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| Abstract: | Prefabricated, lightweight building elements are widely used in the building construction sector. Such elements consist of fibrous thermal insulation encapsulated between two metal sheets. Under various circumstances, moisture can appear in the insulation matrix. Since the temperature of the boundary metal sheets changes dynamically with meteorological conditions, heat and mass transfer between boundaries appear in this case. This paper presents a transient model of the heat and mass transfer, including the sorption and condensation processes. A numerical model considers the dynamical changing of the boundary temperatures. A parametric study considering different amplitudes of temperature change, different moisture masses and different thicknesses of the insulation matrix was made. It was found that a relatively small mass of water in the insulation matrix can result in a significantly increased average heat flux during a periodic cycle. The numerical code was verified with experiments, which showed good agreement with the numerics. |
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