Final report on common definition for nZEB renovation : ZenN : Nearly Zero Energy Neighborhoods : D.1.2 Report

This report is a delivery of the project Nearly Zero energy Neighbourhoods (ZenN). The project is being implemented 2013 – 2017 and is funded through EU's Seventh Framework Programme (FP7). This report is the deliverable D1.2 connected to WP1, Task 2.1 which has given the premises for how to define nearly zero energy buildings (nZEB) within ZenN. The report is divided into two parts: 1) Part A – Literature review which presents the current knowledge about ZEB definitions. 2) Part B – Common definition of nZEB renovation which presents the definition agreed upon by the ZenN partners. Five main sources have been in identified which contain state-of-art knowledge to aid in defining nZEBr which are: • IEA SHC Task40 / EBC Annex 52: “Towards Net Zero Energy Solar Buildings” (IEA 2013, IEA\SHC 2013) • BPIE report: “Principles for nearly zero-energy buildings” (BPIE 2011) • EPBD – CA (Concerted Action) REHVA papers (Kurnitski 2013) • EC project: “Towards nearly zero-energy buildings – Definition of common principles under the EPBD” (ECOFYS, Politechnico_di_Milano/EERG et al. 2012) • Standard: prEN 15603:2013 Energy performance of buildings - Overarching standard EPBD and related technical reports (TR 2013, prEN15603 May 2013) The structure of both Part A and Part B is based on the structure of IEA SHC Task 40 / EBC Annex 52 “Towards Net Zero Energy Solar Buildings” (IEA 2012), which considers five main criteria: Building system boundary, Weighting system, Net ZEB balance, Temporal energy match characteristics and Measurement and verification. In part B, a last chapter called "Net ZEB evaluation" is included, describing the pilot cases before and after renovation using the common nZEBr definition and IEA net ZEB evaluation tool. The "after-figures" are here based on theoretical values collected through BEST tables included in ZenN Annex I - Description of Work.