The Dübendorfer Urban Energy Systems Laboratory of the Eidgenössische Materialprüfungs- und Forschungsanstalt ( Empa ) has developed measures to reduce the greenhouse gases of the 1.8 million buildings in the country. The laboratory wants to show what the appropriate steps are and in which order they should be taken, it says in a message . The goal is a decisive reduction in CO2 emissions for heating and cooling in order to achieve Switzerland's net zero target by 2050. If the ecological renovation of the building stock progressed at the current pace, it would take another 100 years, Empa calculates.
Led by Kristine Orehounig, the researchers used data mining to divide all residential and commercial buildings in Switzerland into over 100 archetypes, depending on the year of construction, heating type, location and number of users. Then all of them were checked for their suitability for photovoltaics and connection to a heating network.
According to Empa, this sorting work has shown that it is worthwhile to start renovating the roofs and windows of older buildings particularly quickly. This should be followed by the renovation of heating systems in almost all house types. It is important to replace fossil fuels as quickly as possible with photovoltaics on roofs and facades. The research team recommends generating heat using heat pumps and biomass heating. "If the proposed measures are taken," believes Kristine Orehounig, "the greenhouse emissions in Switzerland's existing building stock can be reduced by 60 to 80 percent".
