Nearly Zero Energy Buildings as a Standard of 21st Century – Velux RenovActive

Abstract

Most residential buildings in Slovakia, built in the 20th century, do not meet current requirements for energy efficiency. Therefore, nationwide remedial measures have been taken to improve the energy efficiency of these buildings and reduce their energy consumption. That is why Velux has created a RenovActive project to make this possible. The goal of renovations is to ensure today´s strict conditions for the energy consumption of buildings and thus achieve nearly zero energy buildings. In this article, we focused on the reconstruction of an old family house, which was built in 1960. The family house has been uninhabited for decades and was in a desolated state. We created three different options of reconstruction for the family house, each with different materials and technical equipment. Part of the article is also a comparison of the need for energy in each variant of reconstruction. We also processed a comparison of investment costs required for individual variants. The article also describes the current state of the family house. Currently, the house is inhabited by a young family and measurements of the basic quantities of internal well-being take place in the house. The aim of this project was to turn an old family house into a nearly zero energy building and ensure the required internal well-being at the level of 21st century.