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Acknowledgements A book reflects the work of many, not only the author, who writes by standing on the shoulders of those who have gone before. Therefore, I would like to thank the thousands of students I have encountered during 38 years of teaching. They gave me the opportunity to test the content. Although I started my career as a structural engineer, my predecessor Professor Antoine de Grave planted the seeds that fed my interest in building physics. The late Bob Vos of TNO, the Netherlands, and Helmut Künzel of the Fraunhofer Institut für Bauphysik, Germany, showed the importance of experimental work and field testing to understand building performance, while Lars Erik Nevander of Lund University, Sweden, taught that solving problems in building physics does not always need complex modelling, mainly because reality in building construction is much more complex than any model could simulate. Several researchers and PhD students have been involved during the four decades at the Laboratory of Building Physics. I am very grateful to Gerrit Vermeir (now Emeritus Professor), Staf Roels, Dirk Saelens and Hans Janssen, who became colleagues at the Department of Civil Engineering, Faculty of Engineering Sciences at KULeuven; Jan Carmeliet, now professor at ETH-Zürich; Piet Standaert, principal at Physibel Engineering; Jan Lecompte at Bekaert NV; Filip Descamps, a principal at Daidalos Engineering and part-time professor at the Free University Brussels (VUB); Arnold Janssens, professor at Ghent University (UG); Rongjin Zheng, associate professor at Zhejiang University, China; Bert Blocken, full professor at the Technical University Eindhoven (TU/e); Griet Verbeeck, now professor at Hasselt University, and Wout Parys, now a principal at BauPhi Engineering and part-time professor at the Faculty of Engineering Technology of KULeuven, who all contributed by their work. The experiences gained as a structural engineer and building site supervisor at the start of my career, as building assessor over the years, as researcher and operating agent of four Annexes of the IEA, Executive Committee on Energy in Buildings and Communities, forced me to rethink the engineering-based performance approach each time. The many ideas I exchanged and received in Canada and the USA from Kumar Kumaran, the late Paul Fazio, Bill Brown, William B. Rose, Joe Lstiburek and Anton Ten Wolde were also of great help. Finally, I thank my family, my wife Lieve, who has managed living together with a busy engineering professor, my three children who had to live with that busy father, and my grandchildren. Hugo S.L.C. Hens Leuven, July 2017 XV


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