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Heat and air flow in low energy buildings

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Abstract:
In this talk we will introduce some physical models for the heat and air flow in low energy buildings, using a combination of natural ventilation, thermal mass and night cooling. We will describe the balance between the ventilation flows and the heat loads or cooling loads required in a building. Using this model, we will explore how some of the non-linearities of the convection can lead to multiple steady state regimes under identical conditions. The talk will be illustrated with laboratory experiments as well as simplified theoretical models. Emphasis will be placed on the implications of the modelling for control, and some examples of simple control strategies will be presented.

http://www.bpi.cam.ac.uk/
Type of Seminar:
Public Seminar
Speaker:
Prof. Andy W. Woods
BP Institute for Multiphase Flow, Cambridge University
Date/Time:
Jul 06, 2006   17:15
Location:

ETH Zentrum, Gloriastrasse 35, Building ETZ, Room E6
Contact Person:

Prof. M. Morari
No downloadable files available.
Biographical Sketch:
Professor Andy Woods has research interests in a variety of fluid flow processes many including phase changes. The character of the work includes both theoretical analysis and experimental modelling. Since receiving his BA in Mathematics in Cambridge (1985; St Johns College) and PhD in 1989, from DAMTP in Cambridge, he has worked in Scripps Institute of Ocenaography (La Jolla California : Green Scholar 1989-1990), the Institute of Theoretical Geophysics, Lecturer, Cambridge 1990-1996; School of Mathematics, Bristol as a Professor of Applied Mathematics,1996-2000; and now he is the BP Professor, Cambridge, 2000-present, as well as a Professorial Fellow of St Johns. He was the recipient of the Marcello Carapezza Prize, 1997; the Italgas Prize, 1997 and the Wager Medal, 2002, as well as being the Bullerwell Lecturer 2000, the Stewartson Lecturer 1999, and he gave the GFD Lecture, 2003. His research has explored a wide variety of problems including (i) the dynamics of explosive volcanic systems: both subsurface and atmospheric processes associated with such volcanism, and the related topic of two phase flow in pipelines; (ii) geothermal systems, especially superheated systems, in which there is continual water- vapour phase change, and fluid-mineral dissolution; (iii) natural ventilation flows in buildings, work which has recently led to the energy saving e-stack system, as well as new strategies for combining thermal mass with natural ventilation, to achieve both comfort and energy efficiency; (iv) models of traffic flow dynamics; (v) oil-water-gas flows in porous rocks and problems asssociated with residual oil recovery.