Building Physics - Heat, Air and Moisture (eBook)

Dr. Ir. Hugo S.L.C. Hens is an emeritus professor of the University of Leuven (KULeuven), Belgium. Till 1972, he worked as a structural engineer and site supervisor at a medium-sized architectural office. In 1975, after defending his PhD thesis, he started the building physics research unit within the Faculty of Engineering of the university. He taught building physics from 1975 to 2003, performance based building design from 1975 to 2005 and building services from 1975 to 1977 and 1990 to 2008. He has authored and co-authored approx. 70 peer-reviewed journal papers and 170 conference papers, has helped to manage hundreds of building damage cases and acted as coordinator of the CIB W40 working group on Heat and Mass Transfer in Buildings from 1983 till 1993. Between 1986 and 2008, he was operating agent of the Annexes 14, 24, 32 and 41 of the International Energy Agency's EXCO on Energy in Buildings and Communities. He is a fellow of the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE).

Prof. em. Dr.-Ing. Hugo S. L. C. Hens, Universität Löwen (K.U. Leuven/Belgien), lehrte Bauphysik von 1975 bis 2003, Baukonstruktion von 1975 bis 2005 und Technische Gebäudeausrüstung von 1975 bis 1977 sowie von 1990 bis 2008. Bis 1972 war er als Tragwerksplaner und Bauleiter für Wohnhäuser, Büro- und Geschossbauten in einem Architekturbüro tätig. Er hat als Autor bzw. Koautor ca. 70 wissenschaftliche Aufsätze und ca. 170 Tagungsbeiträge veröffentlicht und hunderte Schadensgutachten erstellt. In der Zeit von 1983 bis 1993 koordinierte er die internationale Arbeitsgruppe CIB W40 "Heat and Mass Transfer in Buildings". Von 1986 bis 2008 war er im Rahmen des Forschungsprogramms "Energy Conservation in Buildings and Community Systems" der Internationalen Energieagentur IEA für die Erarbeitung von Annex 14, Annex 24, Annex 32 und Annex 41 verantwortlich. Er ist Mitglied der American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE).

Introduction
0.1 Subject of the book
0.2 Building physics
0.3 Importance
0.4 History
0.5 Units
0.6 Symbols
1 Heat transfer
1.1 Overview
1.2 Conduction
1.2.1 Conservation of energy
1.2.2 The conduction laws
1.2.3 Steady state
1.2.4 Transient
1.3 Heat exchange at surfaces
1.4 Convection
1.4.1 In general
1.4.2 Typology
1.4.3 Quantifying the concevtive surface film coefficient
1.4.4 Values for the convective surface film coefficient
1.5 Radiation
1.5.1 In general
1.5.2 Definitions
1.5.3 Reflection, absorption and transmission
1.5.4 Radiant bodies
1.5.5 Simple Formulae
1.6 Building-related applications
1.6.1 Surface film coefficients and reference temperatures
1.6.2 Steady state: flat assemblies
1.6.3 Local inside surface film coefficients
1.6.4 Steady state: two and three dimensions
1.6.5 Heat balances
1.6.6 Transient
1.7 Problems and solutions
2 Mass Transfer
2.1 Generalities
2.1.1 Quantities and definitions
2.1.2 Saturation degrees
2.1.3 Air and moisture transfer
2.1.4 Moisture sources
2.1.5 Air and moisture in relation to durability
2.1.6 Link to energy transfer
2.1.7 Conservation of mass
2.2 Air
2.2.1 Overview
2.2.2 Air pressure differentials
2.2.3 Air permeances
2.2.4 Airflow in open-porous materials
2.2.5 Airflow across assemblies with air-open layers, leaky joints, leaks and cavities
2.2.6 Air transfer at the building level
2.2.7 Combined heat and air flow in open-porous materials
2.3 Vapour Transfer
2.3.1 Water vapour in the air
2.3.2 Water vapour in open-porous materials
2.3.3 Vapour transfer in the air
2.3.4 Vapour flow by diffusion in open-porous materials and assemblies
2.3.5 Vapour flow by diffusion and convection in open-porous materials and assemblies
2.3.6 Surface film coefficients for diffusion
2.3.7 The surface film coefficient for diffusion applied
2.4 Moisture
2.4.1 Overview
2.4.2 Water flow in a pore
2.4.3 Vapour flow in a pore that contains water isles
2.4.4 Moisture flow in a pore that contains water isles
2.4.5 Moisture flow in materials and assemblies
2.4.6 Simplified moisture flow model
2.5 Problems and solutions
3 Combined Heat, Air and Moisture Flow
3.1 Introduction
3.2 Material and assembly level
3.3 Whole building level
3.4 Problems and solutions
Postscript


VORWORT
THEORIE DES WÄRMETRANSPORTS
Einleitung
Wärmeleitung
Konvektion
Strahlung
Anwendungsbeispiele und Aufgaben
Literatur
THEORIE DES STOFFTRANSPORTS
Einleitung
Luftströmung
Wasserdampftransport
Feuchtetransport
Anwendungsbeispiele und Aufgaben
Literatur
GEKOPPELTER WÄRME-, WASSERDAMPF- UND FEUCHTETRANSPORT
Einleitung
Annahmen
Lösung
Erhaltungssatz
Strömungsgleichungen
Stationäre Berechnung
Anfangs-, Rand- und Grenzbedingungen
Beispiele für vereinfachte Modellbildung
Literatur