Cost optimal and nearly zero (nZEB) energy performance calculations for residential buildings with REHVA definition for nZEB national implementation

Jarek Kurnitski*, Arto Saari, Targo Kalamees, Mika Vuolle, Jouko Niemelä, Teet Tark

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

177 Citations (Scopus)

Abstract

This study determined cost optimal and nearly zero energy building (nZEB) energy performance levels following the REHVA definition and energy calculation methodology for nZEB national implementation. Cost optimal performance levels - meaning the energy performance leading to minimum life cycle cost - were calculated with net present value method according to the cost optimal draft regulation. The seven-step procedure was developed to conduct cost optimal and nZEB energy performance levels calculations in systematic and robust scientific fashion. It was shown that cost optimal primary energy use can be calculated with limited number of energy simulations as only four construction concepts were simulated and cost calculated. The procedure includes the specification of building envelope components based on specific heat loss coefficient and systems calculation with post processing of energy simulation results, without the need to use iterative approach or optimization algorithm. Model calculations were conducted for Estonian reference detached house to analyse the difference between the cost optimal and nZEB energy performance levels. Cost optimal energy performance level of Estonian reference detached house was 110 kW h/(m 2 a) primary energy including all energy use with domestic appliances and it was significantly lower than the current minimum requirement of 180 kW h/(m2 a).

Original languageEnglish
Pages (from-to)3279-3288
Number of pages10
JournalEnergy and Buildings
Volume43
Issue number11
DOIs
Publication statusPublished - Nov 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • Cost optimal
  • Energy performance
  • EPBD recast
  • Global cost
  • Nearly zero energy buildings
  • nZEB
  • REHVA nZEB technical definition

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