The effectiveness of mechanical exhaust ventilation in dwellings

Ventilation systems play an important role in providing a good indoor air quality in dwellings. Mechanical exhaust ventilation systems implement natural vents to supply outdoor air to the dwelling. Natural driving forces, i.e. wind and thermal draught, influence the flow rates through these supply vents. Therefore, the flow rates depend on the weather conditions and vary in time. This study considers the influence of the wind and thermal draught on the operation of a mechanical exhaust ventilation system in a reference dwelling.

Component leakage: potential improvement graphs and classification of airpaths

Last years, interest in airtightness increases among all construction fields and airtightness becomes a major issue in the reduction of energy consumption in buildings. Nevertheless, there is a lack of understanding of air displacements through weak spots in buildings (airpaths). Firstly we develop first the concept of Potential Improvement Graph (PIG chart). These graphs represent the “improvement curves” of a given airpath (airflow indicator against airpath parameter). As an airpath can have multiple significant parameters, PIG charts can be n-dimension graphs.

Study of variants to classical mechanical exhaust ventilation systems by using mechanical exhaust in habitable rooms

Nowadays, due to the higher energy performance of dwellings, ventilation plays an increasing role in maintaining a good indoor comfort. Therefore new ventilation strategies in combination with demand controlled ventilation are needed to accomplish high energy-efficient ventilation (limiting ventilation losses and auxiliary energy consumption) while providing good indoor air quality, thermal and acoustic comfort.

Demand controlled ventilation in school and office buildings: lessons learnt from case studies

Demand controlled ventilation (DCV) refers to a ventilation system with air flow rates that are controlled based on a measurement of an indoor air quality (IAQ) and/or thermal comfort parameter. DCV operates at reduced air flow rates during a large amount of the operation time. Due to this decrease, less energy is needed for fan operation and heating/cooling the supply air. However, uncertainty still exists about the IAQ performance and ventilation efficiency in the room, especially at lower air flow rates.

REHVA Brussels Summit

The REHVA Brussels Summit will launch a new sequence of REHVA meetings offering an intense 2-days event with a new concept and a revamped visual design.

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Register now for the ventilative cooling workshop on Oct-23

The preliminary programme for the workshop "Ventilative cooling in buildings: now & in the future" to be held on Monday October 23, 2017 at the BBRI offices (Boulevard Poincaré 79, 1060) in Brussels, Belgium is now available.

The event will discuss the outcomes of IEA-EBC Annex 62 “ventilative cooling” as well as future challenges and possibilities for international collaboration.

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International workshop on ventilative cooling

The workshop will be held on Monday October 23, 2017 at the BBRI offices (Boulevard Poincaré 79, 1060) in Brussels, Belgium.

The participants will present and discuss the outcomes of IEA-EBC Annex 62 “ventilative cooling” as well as future challenges and possibilities for international collaboration.

The workshop is an initiative of IEA-EBC annex 62 & venticool and is hosted by INIVE-BBRI & KU Leuven.

Participation to the workshop is free.

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23 October 2017, International Workshop, Brussels, “Ventilative cooling in buildings: now & in the future”

The current development in building energy efficiency towards nZEB buildings represents a number of new challenges to design and construction. One of these major challenges is the increased need for cooling in these highly insulated and airtight buildings, which is not only present in the summer period but also in the shoulder seasons and in offices even in midwinter. Ventilative cooling can be an energy efficient solution to address this cooling challenge in buildings.

 

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