The airtight building envelope is an important prerequisite for the energy-saving building and for the prevention of building damages caused by moisture in the building construction. This is important both for new buildings as well as for construction projects on existing buildings. Particularly in the case of passive houses, a high value is placed on the airtightness of the building envelope (the air exchange rate (n50) must not exceed 0.6 h-1).
The airtightness of the buildings can be checked with a Blower Door measurement. The tightness of the building envelope is usually defined by a vacuum measurement. During this method, air is withdrawn from the interior of the building. As a result of the negative pressure, the exterior air flows through the flaws into the building. The overpressure measurement can be regarded as a supplement to the vacuum measurement. With the help of a fan, air is blown into the house, which causes a pressure increase there. The air leaves the building through the flaws. Air exchange rates provide information on leaks in the building envelope, which can be located and systematically eliminated during the Blower Door measurement.
The Blower Door measurement has been a recognized rule of engineering since 1998. The airtight building envelope is one of the requirements prescribed by the German Energy Savings Regulation (EnEV): according to DIN EN 13829: 2001-02 by a pressure difference between inside and outside of 50 Pa, the air exchange rate (n50) of buildings without room air-conditioning systems must not exceed 3.0 h-1 and of buildings with air-conditioning systems 1.5 h-1.
Evidence management is part of every sustainability certification and energy monitoring. The sustainability certification according to BNB / DGNB was introduced in 2013 for public buildings.
Rental – Return The Minneapolis Blower Door measuring instrument can be borrowed by Prof. Martin Wollensak in the office 1.402. The length of the borrowing time is according to the agreement.
Usage The borrower confirms that the borrowed object is used exclusively for research purposes as part of the course at the Faculty of Architecture and Design, University of Wismar. The rental object may neither be passed on to, nor rented or sold to, unauthorized third parties.
Care The borrower commits himself to particular care in handling the rental object. The borrowed object is delivered cleanly and functionally and must be returned in this state. No irreversible, technical modifications may be made to the rental object.
Liability If the rental object is damaged by improper handling, the borrower is liable for the resulting damage. This also applies to the case where the rental object is lost. The borrower is obligated to ensure adequate theft protection.