TY - CONF A1 - Marszal, Anna Joanna A1 - Bourelle, Julien S. A1 - Musall, Eike A1 - Heiselberg, Per A1 - Gustavsen, Arild A1 - Voss, Karsten T1 - Net Zero Energy Buildings - Calculation Methodologies versus National Building Codes T2 - EuroSun Conference 2010, Graz, 28.9-30.9.2010 N2 - The international cooperation project IEA SHC Task 40 / ECBCS Annex 52 “Towards Net Zero Energy Solar Buildings”, attempts to develop a common understanding and to set up the basis for an international definition framework of Net Zero Energy Buildings (Net ZEBs). Th e understanding of such buildings and how the Net ZEB status should be calculated differs in most countries. This paper presents an overview of Net ZEBs energy calculation methodologies proposed by organisations representing eight different countries: Austria, Canada, Denmark, Germany, Italy, Norway, Switzerland and the USA. The different parameters used in the calculations are discussed and the various renewable supply options considered in the methodologies are summarised graphically. Thus, the paper helps to understand different existing approaches to calculate energy balance in Net ZEBs, highlights the importance of variables selection and identify possible renewable energy supply options which may be considered in calculations. Finally, the gap between the methodology proposed by each organisation and their respective national building code is assessed; providing an overview of the possible changes building codes will need to undergo in the coming years. KW - Label Y1 - 2010 UR - https://opus4.kobv.de/opus4-hs-duesseldorf/frontdoor/index/index/docId/1986 UR - https://www.researchgate.net/publication/266247323_Net_Zero_Energy_Buildings_-_Calculation_Methodologies_Versus_National_Building_Codes CY - Graz ER -