An experimental campaign was organized during the summer period 2002 in Athens, in the framework of the European RESHYVENT Project. The main purpose was to indicate the impact of the urban environment on the natural and hybrid ventilation air flow process in urban canyons. Field and indoor experimental procedures were carried out in two urban canyons, presenting different geometric and urban features. The experiments were organized for more than three consecutive days within three different periods in summer and on a 24-hour basis.
The hygrothermal behavior of a building component exposed to weather is an important aspect of the overall performance of a building. Today the hygric transport phenomena through a building envelope are well understood and a realistic assessment of all relevant effects can be carried out by one of the numerous models and computer programs, that have been developed in different countries over the last years. The calculation of the hygrothermal performance of a part of the envelope is state-of-the-art, but until now, the total behaviour of the actual whole building is not accounted for.
Dynamic simulation calculations were operated using TRNSYS software applied to a low energy house. This article is the second one of a serie of two. The first one was dealing with ventilation. This one mainly concerns heating system and domestic hot water production through a gas boiler. It also gives general conclusions, some of them dealing with ventilation.
This article compares the requirements for mechanical ventilation systems in the new German regulation on energy savings (EnEV 2002) with those contained in the previous regulation (named WSchV 1995). It also gives information about the way to test and certify mechanical ventilation components according to this new regulation.
There is a relationship between geometric room parameters and the air flow patterns produced by mechanical ventilation systems. Experimental measurements of indoor air flows in a one-tenth sub-scale model room were made and compared to numerical simulations. The results show how obstructions can influence the air flow and contaminant transport in a room.
Dynamic simulation calculations were operated using TRNSYS software applied to a low energy house, fitted with a balanced mechanical ventilation system with heat recovery.
This booklet summarizes the work of IEA ECBCS Annex 35 'Hybrid ventilation in new and retrofitted office buildings' and is based on the research findings from the participating countries. It describes the principles of hybrid ventilation technologies, control strategies and algorithms, as well as analysis method. The 13 case studies include both new-built and retrofitted designs. The booklet is accompanied by 21 technical reports and 13 case study reports from various authors.
The main aim of the Tip-Vent project was to provide a contribution o the creation of improved boundary conditions for the application of mechanical ventilation systems with good levels of performance. The project has led to a better understanding of the true performance of ventilation systems, why they perform as they do and what improvements are achievable. The Tip-Vent source book synthetises the findings of the projects participants.
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.
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