Paper 11: Volume 5 No.1 June 2006 Edition
Achieving Natural and Hybrid Ventilation in Practice
Martin
Liddament1, James Axley2, Per Heiselberg3,
Yuguo Li4 and Ted Stathopoulos5
1VEETECH Ltd., 7a
Barclays Venture Centre,.University
of
Warwick
Science
Park
,
Sir
William Lyons Road,
CV4 7EZ
,
UK
.
2
School of Architecture,
Yale
University
,
New Haven
,
CT
,
USA
.
3Hybrid Ventilation Centre, Department of Civil Engineering,
Aalborg University
,
Denmark
.
4Department
of Mechanical Engineering, The
University
of
Hong Kong
,
Pokfulam Road
,
Hong Kong
, SAR.
5 Centre for Building Studies, Department of Building, Civil and
Environmental Engineering,
Concordia
University, Montreal, Quebec, Canada.
Abstract
Case studies provide essential evidence about the
performance of buildings. They also illustrate the methods by which a
technology can be implemented as well as highlighting problems. Various
case study buildings (both new and retrofit) that incorporate mixed mode,
natural ventilation and low energy cooling are reviewed in this paper. An
outline of the tasks that ventilation is required to perform is also
presented. The results show that many buildings perform well and can
provide good thermal comfort and air quality for much of the occupied
period. Various solutions have been introduced to extend the range and
climate in which such buildings can operate. These include pre
conditioning the air using underground labyrinths or buried pipes, the
inclusion of pre-heating and cooling coils, and the use of thermal mass
combined with night cooling. Design and operational faults include
incorrect assumptions about heat gains, the failure of components,
inaccessible components, structural failures and problems with outdoor air
quality. These aspects are described in more detail in the paper.
Key words: case studies, natural ventilation, mixed mode
ventilation, hybrid ventilation, passive cooling, new buildings, existing
buildings, ventilation problems.
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