Abstract
The current outdated state of many institutional and administrative buildings in the EU region poses a significant burden from the energy sustainability point of view. According to the contemporary EU requirements on the energy efficiency of buildings maintenance, an evaluation of performed improvements is essential for the assessment of expended investments. This paper describes the effect of building envelope reconstruction works consisting in the installation of a thermal insulation system. Here, a long-term continuous monitoring is used for the extensive assessment of the seasonal and daily temperature and relative humidity fluctuations. The obtained results include temperature and relative humidity profiles in the wall cross-section as a response to the changing exterior climatic conditions. The analysis of measured data reveals substantial improvements in thermal stability of the analyzed wall during temperature peaks. While the indoor temperatures exceeding 28 °C are recorded during summer before application of the thermal insulation layer, the thermal stability of the indoor environment is distinctly upgraded after performed improvements. Based on the complex long-term monitoring, a relevant experience is gained for the future work on energy sustainability and fulfilment of the EU directives.
Highlights
Building maintenance represents a substantial part in the total worldwide energy consumption
The average monthly temperature was slightly higher in 2014 compared to 2013, which was more distinct during spring and autumn
Temperature profiles were determined for selected days, which allows year-to-year comparison based on the similar day weather conditions
Summary
Building maintenance represents a substantial part in the total worldwide energy consumption. The buildings designed in previous decades, in many cases, do not provide stable ambient conditions, during seasonal temperature fluctuations They do not meet the requirements on thermal comfort for inhabitants. Regarding the efforts to decrease the energy consumption, these outdated buildings with poor thermal performance require an installation of additional heating/cooling devices [5]. This common temporary solution is beneficial for managing the thermal comfort, but it leads to an energy demanding and noisy service. The installation of the additional external insulation system was done in autumn/winter 2013, in order to improve the indoor environment quality for building inhabitants and decrease of sensitivity of the building to the exterior temperature fluctuations. The performance of the applied insulation systems is evaluated on the basis of the comparison of the long-term monitoring data before and after conducted reconstruction works
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