Determining the expenses for heating of a residential building using different energy sources

The heating of residential and industrial buildings is important for creating a good microclimate in them and for their normal functioning. This article defines the thermal losses of an energy model of a residential building according to the energy efficiency legislation in force in the Republic of Bulgaria. The advantages and disadvantages of using different energy sources for buildings heating are considered. Various types of energy sources- conventional and alternative (electricity, pellets, HHO gas, LPG, natural gas – CNG, gas oil) are used. Comparison and analysis of the expenses, energy and environmental impact of their implementation has been done. (paper)