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Plenty of steam around extractors Press Release 2 May 2019 The Passive House Institute closely examined different extractor hood systems especially in airtight buildings. The scientists also examined the minimum extract air volume that is necessary for collecting a specific amount of vapours (fumes). Picture: Pixabay Plenty of steam around extractors Passive House Institute examines extractor hood systems in energy efficient buildings Darmstadt, Germany. In a new study, the Passive House Institute focuses on systems for vapour extractors, with the research report also resulting in a handbook for extractor hoods in Passive House buildings. This contains the key principles for a compatible system and its dimensioning. Research findings will be presented during the Passive House Conference "Achieve Better Buildings!" on 3 and 4 May 2019 in Heidelberg. The Institute will also present the findings at the 23rd International Passive House Conference in China in autumn 2019. In view of greater energy efficiency of buildings and increased demand for thermal comfort by occupants, the scientific focus has shifted to extractor hoods particularly in airtight buildings. Oliver Kah and Kristin Bräunlich of the Passive House Institute evaluated the various extractor hood systems together with the ITG Institute for Building Systems Engineering in Dresden, the IHD Dresden Institute for Wood Technology, and the company Naber GmbH. The interaction of the extractor systems with the building was also studied. The experimental setup for vapour collection in the kitchen studio. Picture: PHI Wall mounted hoods take precedence "The design of the extractor hood and its position in the room have considerable influence on the amount of vapours collected and the volume flow rate that is necessary for this purpose", explains Oliver Kah of the Passive House Institute. The results indicate for example that already at lower operating stages the amount of fumes captured by extractor hoods mounted on the wall (recirculation air and extract air) is comparable to that of cooktop extractors. This series of photographs visualises the differences between the capture of vapours (fumes) at different operating stages. The type and quality of the extractor system also has an effect on the amount collected. The ventilation system shown here collects the vapours completely already at the operating stage 3. Series of photographs: Passive House Institute Circulation air is preferable In buildings with a very small heating demand, such as Passive Houses, the Passive House Institute recommends the installation of recirculation air hood systems. Exhaust air hood systems may increase the heating demand of energy efficient buildings significantly; in addition, it is usually easier to integrate recirculation air systems. The tests also showed that in combination with a home ventilation system, the results achieved by good recirculation air hood systems are almost similar to those obtained with exhaust air systems with reference to the reduction of odours. Removal of moisture Unlike exhaust air extractor hoods however, recirculation air hoods do not remove the moisture arising during cooking. Basic ventilation is therefore recommended for the adequate removal of moisture in kitchens. "In Passive House buildings and frequently also in other energy efficient buildings, controlled ventilation constitutes a part of the building concept in any case. Thus adequate basic air exchange is already ensured in these buildings, due to which the moisture loads are removed", explains Kristin Bräunlich of the Passive House Institute. Hardly any cost differences There are hardly any differences when consider- ing the overall costs for the exhaust air and recirculation air systems: while annual costs for replacing the active carbon filter are incurred with the recirculation air systems, exhaust air systems cost slightly more due to the installation costs and incur higher heating energy costs caused by the additional ventilation heat losses. Exhaust air situation / Recirculation air situation. © Naber GmbH Essential for exhaust air hood systems For buildings with extremely low heating demands such as Passive House buildings, the Passive House Institute recommends the installation of recirculation air hood systems. However, if an exhaust air system is installed, then attention should be given to the following points: o Solutions should be provided for incoming air flow. o The exhaust air outlet and air inlet must be equipped with airtight seals. Non-return valves are usually insufficient. o Preference should be given to systems which ensure adequate air capture using moderate exhaust air flows. o In smaller homes the additional ventilation heat loss may increase the specific area- related heating demand and also the heating load significantly. Exhaust air extractor hood systems are therefore not advisable in buildings with mainly smaller dwelling units. This research on extractor hood systems in energy efficient buildings was funded by the research initiative "Future Building" of the German Federal Institute for Research on Building, Urban Affairs and Spatial Development (reference number : SWD-10.08.18-7-17.27). Presentation in Heidelberg The research report on extractor hoods in combined kitchen and living areas and the handbook resulting from this will soon be available on the Passive House Institute homepage to download free of charge. The latest research results will also be presented by the Passive House Institute at both their upcoming Passive House conferences. During the Passive House Conference "Achieve Better Buildings!" on 3 and 4 May 2019 in Heidelberg, the presentation on extractor hood systems in the English language will be held on Saturday, 4 May 2019 starting at 11:00 a.m. https://heidelberg.passivhaustagung.de/en/ Presentation in China In addition, analyses of the extractor hood systems in energy efficient buildings will be presented at the 23rd International Passive House Conference from 9 to 11 October 2019 in Gaobeidian in China. https://passivhaustagung.de/en/ Contact person: Katrin Krämer / Press Officer / Passive House Institute E-mail: presse@passiv.de / Tel: +49 (0)6151 / 826 99-25 |
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