This report summarizes the work of the initial working phase of IEA Annex 35 "Hybrid Ventilation in New and Retrofitted Office and Educational Buildings". It describes the state-of-the-art of hybrid ventilation technologies, of control strategioes and algorithms and of analysis methods. It provides examples of existing systems and show solutions to specific problems in 22 office and educational buildings locate in different outdoor climates.
In 1998, an international research project entitled "Hybrid Ventilation in New and Retrofitted Office and Educational Buildings" was commenced under the auspices of the International Energy Agency. The fourth forum organized within the framework of this project was held in May 2002 in Montreal, Canada. About 25 papers related to the major outcomes and technologies were presented.
This information dossier describes the general principles of natural ventilation, the calculation of air flows and the strategies for building cooling. It presents case studies of six office buildings, with the lessons learned.
The central subject of this Workshop was the challenge offered by energy performance regulations to find adequate solutions for the integration of innovative technologies in such regulations.
The Airways project was set up to provide design guidance and maintain afficient air duct systems, and to bring to light the energy saving opportunities in parallel with health, safety and comfort issues. The results of this work have been published in a book targeted at decision-makers concerned with inddor climate issues. It provides condensed information on better air duct system design and how this can be achieved.
This paper aims at developing and implementing a fuzzy controller for naturally ventilated building.The first objective of this research was to develop and then validate a rule based controller which can vary the resistance of ventilation opening in order to maximise comfort conditions.
The effect of a solar chimney along with a solar screen on the effectiveness of natural ventilation is investigated in this paper.The benefit of the combination of both systems is that it enhances the natural ventilation flow through the building and improves the environmental comfort.
The second part of the paper deals with the measurements of the indoor thermal environment and the ventilation performance of a commercial kitchen.Measurements were made with a tracer gas (SF6) which is non-toxic and odorless.A smoke machine (ROSCO) was placed on the floor of the middle of the kitchen while operating the ventilated ceiling system. Air inlets near the floor or at the lower parts of the walls brought fresh air in the lower part of the kitchen and pushed the smoke upward.The results almost agreed with the results of the previous numerical simulation ( in part 1).
This paper deals with measurement of the capture efficiency of REEXS (Reinforced Exhaust System). For the experiment a local exhaust hood was designed with the possibility of working either as a traditional circular exhaust hood or as a REEXS. Experimental measurements were done both for the traditional hood and the REEXS, with the same exhaust flow rate. The results were then compared.The results proved that the main weaknesses of the traditional local exhaust hood can be improved by using REEXS hood.
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