Abstract
The renovation of historic buildings is essential to meet the Swiss objectives for energy consumption in 2050. These buildings offer a great saving potential, however, the heritage preservation has to be considered in the renovation scenarios. While essential for the historic conservation, this consideration restricts the renovation possibilities to achieve the heating demand requirements according to the SIA 380/1 standard. This study introduces a framework for identifying the suitable historic buildings’ renovation schemes considering life cycle costs, energy and life cycle environmental impacts. With a case study, the feasibility of achieving the energy performance SIA 380/1 standard is then discussed.
Highlights
The reduction of energy consumption in the existing building stock is a crucial element of the Swiss Energy Strategy 2050 since it accounts for more than 44% of the final energy use in Switzerland [1]
The energy-related renovation of historic buildings is a complex process aiming at the preservation of the architectural value of the external façade while improving the building energy consumption
The historic buildings have a large potential for energy savings since they are almost not insulated
Summary
The reduction of energy consumption in the existing building stock is a crucial element of the Swiss Energy Strategy 2050 since it accounts for more than 44% of the final energy use in Switzerland [1]. Breaking down the existing residential building stock into two parts, there are about 32% of residential buildings built before 1945 [2] These buildings, identified as historic buildings in the RIBuild Horizon 2020 European project [3], present a substantial useful energy consumption estimated at about 115 kWh/(m2.an) for MFH and 130 kWh/(m2.an) for SFH which represents 31% of the total demand of the residential building stock [4]. Some of them present an architectural value and a degree of protection defined at the cantonal level (in particular exterior façade protection) leading to a more difficult process for energy-related refurbishment. The energy-related renovation of historic buildings is a complex process aiming at the preservation of the architectural value of the external façade while improving the building energy consumption. Thereby, in many cases, to improve the building thermal envelope, interior insulation is preferred to preserve the exterior façade
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