GEP  Vol.3 No.6 , August 2015
Demonstration of the Nearly Zero Energy Building Concept
Abstract: Nearly zero energy buildings (nZEB) will become an obligatory energy efficiency standard in Europe. Following to common guidelines in European legislation, the countries investigated technical and economic framework for the preparation of detailed national technical definition of nZEB. Slovenia accepted the nZEB criteria in early 2015. This paper describes the technical and economic background for identification of economically viable concepts of highly energy efficient apartment building. The highrise demonstration building Eco Silver House revealed that meeting nZEB standards was not an easy task, not so much for technical reasons, but mostly due to the processes, inadequate skills, not fully compliant regulation and insufficient possibilities for interaction between the building and energy networks. Analysis of cost effectiveness showed that the Eco Silver House fulfilled minimal requirements of cost-optimal for apartment building with Net Present Value of 272 EUR/m2 and Primary energy use of 79 kWh/ m2?a in line with the Slovenian national cost optimal study of minimum energy performance requirements from the year 2014. At the time, the requirement of 50% share of renewables in final energy use is not fulfilled, but will be easily reached when EU2020 energy efficiency targets set in the Slovenian Energy Act regarding the RES share in district heating systems and public power grid will be gradually implemented. The demonstration project FP7 EE-HIGHRISE confirms that in spite of the barriers, the nZEB minimum requirements defined on profound theoretical studies can be met in practice.
Cite this paper: Zavrl, M. , Stegnar, G. , Gjerkeš, H. (2015) Demonstration of the Nearly Zero Energy Building Concept. Journal of Geoscience and Environment Protection, 3, 45-54. doi: 10.4236/gep.2015.36008.

[1]   Kladnik, D. (2004) Settling and Settlements.

[2]   SI-STAT Data Portal. Statistical Office RS.

[3]   National Energy Efficiency Action Plan 2020 (NEEAP 2020) for Slovenia (2015).

[4]   National Plan to Increase the Number of Nearly Zero Energy Buildings (2015).

[5]   Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the Energy Performance of Buildings (Recast)

[6]   Commission Delegated Regulation (EU) No 244/2012 of 16 January 2012

[7]   Aelenei, L., et al. (2015) New Challenge of the Public Buildings: nZEB Findings from IEE RePublic_ZEB Project. Energy Procedia, 6th International Building Physics Conference, IBPC 2015, Elsevier, Torino, 14-16 June 2015, in Press.

[8]   Marszal, A.J., Heiselberg, P., Bourelle, J.S., Musall, E., Voss, K., Sartori, I. and Napolitano, A. (2011) Zero Energy Building—A Review of Definitions and Calculation Methodologies. Energy and Building, 43, 971-979.

[9]   Aelenei, L., Gon?alves, H., Aelenei, D. (2013) The nZEBs in the Near Future Overview of Definitions and Guidelines towards Existing Plans for Increasing nZEBs. Conference Proceedings of SB13 Guimaraes—Contribution of Sustainable Building to Meet EU 20-20-20 Targets, 2013 SB13, Guimaraes (Portugal) Multicomp 2013, 879-886.

[10]   Kurnitski, J., Saari, A., Kalamees, T., Vuolle, M., Niemel?, J. and Tark, T. (2011) Cost Optimal and Nearly Zero (nZEB) Energy Performance Calculations for Residential Buildings with REHVA Definition for nZEB National Implementation. Energy and Buildings, 43, 3279-3288.

[11]   Kurnitski, J., et al. (2013) REHVA nZEB Technical Definition and System Boundaries for Nearly Zero Energy Buildings. REHVA Report No. 4, 2013.

[12]   (2014) FprEN 15603: 2014 Energy Performance of Buildings Overarching Standard EPBD.

[13]   Climate of Slovenia (in Slovenian: Klimatografija Slovenije).

[14]   ?ijanec-Zavrl, M., Gjerke?, H. and Tom?i?, M. (2012) Integration of Nearly Zero Energy Buildings: A Challenge for Sustainable Building stock. World Engineering Forum, 17-21 September 2012, Ljubljana, Slovenia. Sustainable Construction for People. In?enirska zbornica Slovenije, Ljubljana

[15]   ?ijanec-Zavrl, M. and Gjerke?, H. (2013) Sustainable Energy Networks: A Hub for Nearly Zero Energy Buildings. 3rd International Exergy, Life Cycle Assessment, and Sustainability Workshop & Symposium (ELCAS-3), Nisyros, 7-9 July 2013, ELCAS-3.

[16]   ?ijanec-Zavrl, M., Skubic, M., Raku??ek, A., Gjerke?, H. and Poto?ar, E. (2012) Practical Implementation of Cost- Optimal Regulation for Establishing National Minimum Requirements of Slovenia. Proceedings of World Sustainable Energy Days, Wels, 29 February-2 March 2012. O. ?. Energiesparverband, Linz, Wels, 3.

[17]   Gjerke?, H., ?ijanec-Zavrl, M. and Stegnar G. (2014) Heat Pumps and Cost Optimal Building Performance. Proceedings of 2nd Annual International Interdisciplinary Conference, AIIC 2014, Vol. 3, Azores, 08-12 July 2014.

[18]   IMAD (2014) Institute of Macroeconomic Analysis and Development, Development Report, Indicators of Slovenia’s Development.

[19]   ?ijanec Zavrl, M., et al. (2015) Eco Silver House—A Challenge of Integrated Energy Design and Quality Assurance in Demo EE-Highrise Building. Energy Procedia, 6th International Building Physics Conference, IBPC 2015, Elsevier, Torino, 14-16 June 2015, in Press.