Selected issues related to costs of thermal energy carriers and carbon dioxide emissions for a historic sacral building

The main aim of this article was estimation of the heating energy demand and annual heating costs for a classical sacral building equipped with ground source heat pump or gas boiler.For this purpose, a simulation model was developed in the Matlab Simulink 2022b.Heat losses through the building elements were analysed and elements requiring thermal insulation were indicated.According to the research, the current state of the building (without thermal insulation) requires 241.73 kW of peak thermal power and 227.03MWh of thermal energy annually.Values were calculated for 107 days of the heating season and internal temperature of +12 C.According to the results, it is possible to reduce peak power to 107.78 kW (44.5%), and energy consumption to 70.53 MWh (31.1%) in relation to primary values.Annual heating costs presented as a Variant 4 is 5386 EUR for ground heat pump and 7071 EUR for gas heating with CO 2 emission costs included.Variant 5 presents the possibility of additional reduction of maximum heating power, which affects the final cost of the installation.