Assessment of thermo-modernization in a multifamily building

¹ Faculty of Civil and Environmental Engineering, Institute of Environmental Engineering, Poznan University of Technology, 4 Berdychowo St., Poznan 60-965, Poland
² Mercury Engineering Polska Sp. z o.o., 87 Promienista St., Poznan 60-101, Poland

^* Corresponding author: malgorzata.basinska@put.poznan.pl

Abstract

This paper presents an evaluation of thermo-modernisation improvements applied over the years in the multi-family residential building. Those improvements have included the civil and mechanical activities. The civil activities were as follows: the application of the thermal insulation on the external walls and replacement of the windows. The mechanical activities were mainly focused on an adjustment of the heating system to the new reduced heating demands of the building. The heating system in the building was modified - the radiators were replaced with the new ones, the heating central unit was modernised. Moreover the local gas water heaters were eliminated. Then the building’s energy performance characteristics, prepared according to the valid Polish methodology, were compared with the real consumption. It was found that after the application of thermo-modifications the heating demand was reduced, twice. The economy efficiency of the thermo-modernisation was evaluated by means of a method of the annual costs. The annual costs include the heating system exploitation costs, DHW preparation system and the auxiliary devices electricity costs.