Hybrid ventilation

a design guide

Peter J.W. Engel

Hybrid ventilation

paperback/ gebrocheerd: € 12.50

ISBN: 978-90-5269-000-1, geïllustreerd, 63 blz., September 2019, Engels
Gewicht: 280 gram.

better connection of the outdoor climate

The aim of the book is to give an overview of the advantages, history and principles of hybrid and mixed mode ventilation. Natural ventilation plays a key role to improve comfort and reducing energy. In order to make natural ventilation successful, an early integration in the design‐process is necessary. In the long term fully natural ventilated buildings are expected to become the standard, even in high rise buildings (Wood 2013).

However, much more scientific development is necessary in order to guarantee that these buildings will behave as expected. The book is not an advertising book for natural ventilation. In many cases natural ventilation alone for climate control is not possible. However, in most of the cases hybrid or mixed mode types can be applied and these options need more attention. Adaptive thermal comfort is closely related to hybrid and mixed mode buildings in which a wide range of temperatures are possible, with substantial options of saving energy (Humphreys 2015). A key success factor is always the degree of user satisfaction. This is not only related to dissatisfaction, but also to thermal satisfaction. The highest level of thermal satisfaction is called thermal delight. About thermal comfort, air quality and spaces there is still much to learn, especially because it is strongly related to psychology. Knowledge about comfort is generally only available after the period in which the building is built. In some naturally ventilated buildings there have been more problems than expected, due to a lack of knowledge of physical reality or usage of the building.

Mostly it could be solved by adaptations of the original concept. Nevertheless, many naturally ventilated buildings did not need significant adaptations. Moreover, many fully mechanical ventilated buildings have comfort‐problems as well, which are generally not deeply analysed. From both naturally as well as mechanical ventilated buildings we can learn. The development of insight in naturally and hybrid ventilation will also contribute to better mechanical ventilation, as to air quality, thermal comfort and energy consumption. For instance, at the moment the air resistance of mechanical systems becomes lower and the combination with (smart) operable windows is considered as a quality in building certification systems like LEEDS, WELL and BREEAM. Designing natural, hybrid or mixed mode buildings requires a complete other way of thinking about design. It is partly a mixture of mechanical, building physical and architectural engineering, but it is also more. Knowledge about natural air flows and designing with natural air flows is in fact a new profession, for which this book gives a general, and sometimes detailed, outline.

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