Cost-Optimal Plus Energy Building in a Cold Climate

Szymon Firląg


The main objective of this article is to propose possible requirements for cost-optimal plus energy building in a cold, heating dominated climate. The open question is what is more cost-effective: reduction of energy demand or increase of production from renewable energy sources. The target of the research was to check which solution has the lowest investment and maintenance costs. The analysis was made for a single-family house located in central Poland, including three different energy standards: WT2021 with energy need for heating ≤100 kWh/(m² year), NF40 with energy need for heating ≤40 kWh/(m² year) and NF15 with energy need for heating ≤15 kWh/(m² year)). Air and ground source heat pumps were used as a heat source and a photovoltaic system for the production of the electrical energy. For each case the investment and running costs were calculated very precisely, taking into account heating, ventilation, domestic hot water and auxiliary systems. Global cost for a 30-year period showed that house variants with air source heat pumps are more cost effective. The investment, replacement and maintenance cost related with energy systems have the biggest share in the global cost. Reaching the plus energy standard was possible only in the case of low-energy standard NF40 and NF15. Based on this research the proposed requirements for plus energy single-family residential buildings in central Poland are the following: the final (delivered) electrical energy demand (including heating, ventilation, domestic hot water and auxiliary systems) <45 kWh/(m² year) and the on-site electrical energy production >45 kWh/(m² year
Author Szymon Firląg (FCE / ICE)
Szymon Firląg,,
- The Institute of Civil Engineering
Journal seriesEnergies, [ENERGIES], ISSN 1996-1073
Issue year2019
Keywords in English plus energy; cost-optimal; single family house; renewable energy sources; heat pump
ASJC Classification1700 General Computer Science
Languageen angielski
energies-12-03841.pdf 1.77 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 13-07-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; GS Citations = 2.0; Scopus Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.156; WoS Impact Factor: 2018 = 2.707 (2) - 2018=2.99 (5)
Citation count*2 (2020-08-30)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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