Energy consumption in a multi-family residential building

Properly performed calculations of heat consumption in a building are important for the climate and environment due to the increasing emphasis on energy saving aspects. The article analysed the temperatures inside a building, heat consumption, division into individual elements of the heat balance, internal heat gains and relative air humidity in relation to the existing multi-family residential building. The considered building has been thermally modernised and is heated from the municipal heating network. The simulations were conducted using DesignBuilder 7.0 and EnergyPlus software for weather data for Lublin (Poland) in 2024. Thermal comfort requirements have been met, and the total amount of thermal energy for heating purposes is 73,122 kWh. The largest share in the building’s heat balance is external infiltration. The average relative air humidity in the building is 38.02%. Although thermal comfort has been maintained, the relative humidity during winter season is insufficient.