Nearly zero energy renovation concepts for apartment buildings

Kalle Kuusk,Michele De Carli,Clemens Felsmann,Jens Naumann,Massimo Tonon,Annina Gritzki,Jarek Kurnitski,J Kurnitski,T Kalamees

doi:10.1051/e3sconf/202017218009

Kalle Kuusk, Michele De Carli + Show 7 more

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https://doi.org/10.1051/e3sconf/202017218009

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Abstract

Revised EPBD directive has set ambitious targets for renovation. It is stated that Member States shall establish a long-term strategy facilitating the cost-effective transformation of existing buildings into nearly-zero energy buildings. The long-term strategy should set out a roadmap with a view to the long-term 2050 goal of reducing greenhouse gas emissions in the European Union. This creates the need for cost-efficient renovation solutions which can be implemented in large scale. The impact assessment shows that roughly a doubled renovation rate of 3 % would be needed to accomplish the energy efficiency ambitions in a cost-effective manner. The objective of this study is to specify renovation concepts with adequate heating and ventilation, based on Estonian and German apartment buildings and corresponding local solutions. Energy performance and sizing analyses were conducted for selected multifamily apartment buildings typical for 1960-70es with three different renovation concepts. Energy calculations were conducted with national energy calculation methods and national energy requirements for major renovation. In the renovation, the building envelope insulation, air tightness, and heating and ventilation systems were improved so that the renovated building complies with national nearly zero-energy requirement for major renovation.

Highlights

Revised Energy Performance of Buildings Directive [1] has set targets for renovation including establishing a long-term strategy facilitating the cost-effective transformation of existing buildings into nearly-zero energy buildings
The long-term strategy should set out a roadmap with a view to the long-term 2050 goal of reducing greenhouse gas emissions in the EU by 80-95% compared to 1990
This creates the need for cost-efficient renovation solutions which can be implemented in large scale

Summary

Introduction

Revised Energy Performance of Buildings Directive [1] has set targets for renovation including establishing a long-term strategy facilitating the cost-effective transformation of existing buildings into nearly-zero energy buildings. The long-term strategy should set out a roadmap with a view to the long-term 2050 goal of reducing greenhouse gas emissions in the EU by 80-95% compared to 1990. This creates the need for cost-efficient renovation solutions which can be implemented in large scale. Study [2] conducted about the results obtained from the application of a cost-optimal calculation method for identifying proper retrofit measures to reach cost-optimal renovation levels found that the energy saving potential of retrofit cost-optimal targets are very relevant (36–88% in term of net primary energy). Same study concluded that cost-optimal analyses of energy efficiency measures of buildings are mainly based on the different envelope insulation solutions and the selection of heating generators. IEA EBC Annex 56 concluded that when the target is to reduce the carbon emissions, it is advisable to use renewable energies in addition to the energy saving measures because renewable energies reduce the emissions in a more cost-effective way [4]

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