Utvärdering av system för ersättningsluft vid spiskåpeforcering Tekniktävling - Ventilation i energieffektiva flerbostadshus - Etapp 2

Report, 2023

The present report presents a continuation of a technology competition on ventilation in energy-efficient residential buildings. The first stage of the competition was conducted during 2019 - 2020 in collaboration between the trade organizations/networks Svensk Ventilation and BeBo with the overall aim of stimulating new and innovative solutions to ventilation problems in energy efficient residential buildings. The problem addressed in this report is linked to the need to supply replacement air in conjunction with operation of the range hood to avoid disturbing under-pressure in the apartment.

The solutions were tested in a test chamber with low leakage through its envelope. It has smaller dimensions than real apartments. The smaller size means that the pressure changes that occur in the chamber will be faster than they would be in a real apartment. Thus, the technology solutions have been tested under slightly stricter conditions than is normal in real buildings.

The measurements show that both solutions are able to limit the negative pressure indoors so that it becomes higher than 10 Pa just briefly. The solutions are considered robust and long-term stable as they were tested for at least 200 cycles without any malfunction being observed. Over time, however, dust will accumulate on the dampers, which could affect their functioning; that they get stuck and/or that they do not close tightly in the closed position. However, this has not been tested in the current project. Regular inspection and cleaning will be required, especially of the solution installed as an outdoor air valve/supply air radiator, as the damper in that case is exposed to unfiltered outdoor air. The rather slow change in the damper position contributes to the solutions being judged as robust