Single-Family Residential Building Energy Retrofit: A Case Study

Single-Family Residential Building Energy Retrofit: A Case Study

Michał Pierzchalski (Warsaw University of Technology, Poland)
Copyright: © 2018 |Pages: 27
DOI: 10.4018/978-1-5225-4105-9.ch011


This chapter is a case study for the energy retrofit of an existing single-family residential building. The main assumption of the project was creating a model example for an energy retrofit with the aim of achieving the nZEB standard in existing residential building. The discussed building was built between the 1960s and the 1970s. The building was built using mixed technologies. The flooring on the ground floor was replaced; the foundation, external walls, and roof were thermally insulated. The windows and doors were replaced with higher parameter ones. Moreover, a modern biomass boiler was installed in the building along with the installation of a mechanical bidirectional ventilation unit with a heat recovery. Before the renovation, the building used about 133.4 GJ final energy for heating annually. After the renovation, the building uses about 8.89 GJ annually. The author describes all the stages of the renovation, the technical solutions, the calculations of economic and environmental benefits of the conducted renovations.
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Single-family detached houses are by far the most commonly found buildings in Poland. Single-family and multi-family residences constitute 88% of Poland’s residences, and as much as 94% of all residential buildings when taking into account net usable area (Building Performance Institute Europe, 2012).

According to statistical data (Ministry of Infrastructure and Development, 2014a) and analyses by Żurawski (2012) these are primarily buildings with poor thermal insulation and low quality windows, which is connected to the high amounts of energy required to heat these buildings. Table 1 presents a comparative list of existing buildings in Poland. It is important to note that according to Żurawski (2012) the real demand could be higher than the one calculated and presented below by as much as 60%.

Table 1.
Comparative list of residential buildings in Poland (up to 2014) with their respective per unit of energy demand indicators
Year of Construction (Year)Number of BuildingsPer Unit Energy Demand for Final Energy FE (kWh/m2/year)Per Unit Demand for Primary Energy PE (kWh/m2/year)
Before 1918404.77.3>300>350
Under construction27.70.5--

Adapted from Ministry of Infrastructure and Development (2014a).

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