Applied Building Physics: Boundary Conditions, Building by Hugo S. L. C. Hens

By Hugo S. L. C. Hens

The power crises of the Nineteen Seventies, persisting moisture difficulties, lawsuits approximately ill constructions, thermal, visible and olfactory soreness, and the movement in the direction of extra sustainability in development building have driven development Physics to the vanguard of creating innovation. The societal strain to decrease strength intake in constructions with no impairing usability acted as a set off to turn on the complete inspiration of functionality established layout and building. as with any engineering sciences, construction Physics is orientated in the direction of program, that is why, after a primary e-book on basics this moment quantity examines functionality intent and function requisites. outside and indoor weather stipulations are defined and calculation values are mentioned, the functionality idea is designated on the development point and on the construction envelope point, and heat-air-moisture fabric homes are defined.
The publication accommodates 35 years of training construction Physics to architectural, construction and civil engineers, strengthened through forty years of expertise, study and consultancy.

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14. 14. 9). 15. Uccle, month-based time function. 90 These values have to be corrected for surfaces with different shortwave absorptivity. 41) Te′ and Te′ equal the annual mean equivalent temperature for condensation and drying and its amplitude for a north oriented surface with slope 45°. 9. 9 °C. 16. 7°). 012%. Hour Cold winterday Temp. °C Direct sun, A W/m2 Hot summerday Diffuse sun, hor. surface W/m2 Temp. °C Direct sun, A W/m2 Diffuse sun, hor. 9 °C . 44) with pe de annual mean and pe the amplitude.

Water vapour release, in general. 25. Water vapour release in residences, depending on the number of family members. 1 2 3 Number of family members Low water usage1 Average water vapour release in kg/day Average water usage2 1 3 to 4 6 9 2 4 6 11 3 4 9 12 4 5 10 14 5 6 11 15 6 7 12 16 Dwelling frequently unoccupied Average families with children Teenager kids, frequent showers, laundry dried indoors, etc. 26. Water vapour release for an average family, no kids, the two partners working. 4 Vapour release in g/h Cooking Hygiene Total Laundry 120 720 1080 360 0 1680 120 120 1440 1200 4320 Indoor climate classes The indoor/outdoor water vapour pressure excess is such important parameter when it comes to moisture tolerance that buildings have been grouped in indoor climate classes with the excess as pivot.

4] BRE (1971). An index of exposure to driving rain. Digest 127. 5] Hens, H. (1975). Theoretical and experimental study of the hygrothermal behaviour of buildingand insulating materials by interstitial condensation and drying, with application on low-sloped roofs. Doctoral thesis, KU-Leuven (in Dutch). 6] Dogniaux, R. (1978). Recueil des données climatologiques exigentielles pour le calcul des gains solaires dans l’habitat et l’estimation de la consommation de l’énergie pour le chauffage des bâtiments.

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