The choice of the optimal level of the primary energy index for the collective residential buildings

This paper presents an optimal method of choosing a primary energy ratio, depending on the solutions regarding the building's technical equipment. A global cost method was used in the analysis, as that method allows for determining the requirements in relation to the type of the building and the way of energy supply. Analysis regards five –storey building, where 4 floors were repetitive. The building represents a standard of the collective residential buildings. 4 chosen scenarios were analysed: basic one (thermal protection requirements following the requirement valid in Poland in 2008 – SEB), presently valid (including a modernisation helping to fulfil the actual building rules) – SEB*, low energy building – LEB and passive building standard – VLEB. (paper)