Paper 14: Volume 5 No.1 June 2006 Edition
Windows and HVAC Operation to Reduce Cooling
Requirement by Means of Cross-Ventilation
Tatsuo
Nagai
Department
of Architecture, Faculty of Engineering,
Tokyo University of Science, Tokyo, Japan
Abstract
Passive cooling by cross-ventilation has been considered to be a key
technology for reducing cooling requirements. While various applications
have been introduced in both domestic and non-domestic buildings, the
strategy of operating windows and air-conditioners to utilize cooling
potential has not been well investigated. This paper illustrates how
occupants’ behaviour related to window operation affects the reduction
of cooling requirements in domestic buildings. By means of simulation
using TRNSYS and COMIS, several ways of operation were tested and compared
to a reference operation that is assumed to be normal. In addition,
optimal operations for reducing cooling loads are presented by employing
optimization techniques. The methodology helps to find a recommended way
of operation, or to develop a control system that operates windows and
air-conditioning automatically.
Key words: cross-ventilation,
cooling load, window operation, air-conditioner operation, optimisation,
occupants’ behaviour, ventilation rate, dehumidification.
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