The article analyses energy supply alternatives for a partially renovated residential building. In addition to the existing district heating (base case) alternative systems, gas boilers, heat pumps (air-water and ground-water), solar collectors, solar cells, and combinations of these systems have been examined. Actual heat consumption of the building and electricity demand determined by the statistical method are used for simulating the systems. The process of simulation is performed using EnergyPro software. In order to select an optimal energy supply option, the life cycle analysis of all systems has been carried out throughout a life span of the building, and the estimated results of energy, environmental and economic evaluation have been converted into non-dimensional variables (3E) using multi–criteria analysis.

Article in Lithuanian