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A task ahead for Sweden: Renovation of more than a million dwellings in apartment buildings!
August 17, 2015

A task ahead for Sweden: Renovation of more than a million dwellings in apartment buildings!

To fulfill the demands by the directives of the European Union 2020 [1] and 2050 [2], Sweden must retrofit its current building stock in order to achieve a lower energy output. The multifamily buildings in need of renovation consist of more than a million dwellings. These were built from 1950 to 1975, and are in need of renovation or retrofitting mostly due to the building materials and building services having reached, or even passed, the end of their lifespan.

With new regulations in Sweden, renovated buildings must fulfill the same requirements as new buildings which means that they usually have to be retrofitted to a higher standard regarding moisture, energy and ventilation. In order to renovate effectively and properly, new solutions must be developed to solve common issues that arise during and after the renovation process. These solutions must also be properly evaluated for optimization of energy efficiency and a healthy indoor environment. One such solution is a new ventilation system that has been designed especially for alleviating common issues that arise during the renovation process. The new system is a demand controlled ventilation (DCV) system for multifamily houses, which automatically regulates the air change rate (ACR) for each dwelling. This paper aims to evaluate the set point for the moisture supply of this new DCV.


[1] European Comission, 2014-12-11, The 2020 climate and energy package, http://ec.europa.eu/clima/policies/package/index_en.htm.
[2] European Comission, 2015-06-03, EU Action on climate, http://ec.europa.eu/clima/policies/brief/eu/index_en.htm.

Excerpt from the paper on “Moisture supply Set Point for avoidance of moisture damage in Swedish multifamily houses” by Abdul Hamid A., Wallentén P., Johansson D.