Cost-optimal Analysis of Performance Relation Thermal Insulation – Hydronic Heating System Applied to Romanian Residential Buildings

This article aims to investigate a very common issue that concerns every tenant of a residential building directly affected by the increased energy bills – to consider or not spending money in a building envelope rehabilitation program. In attempting to meet this challenge, we propose a numerical simulations study that have been developed to reveal cost-optimal levels for which the effort to invest in increasing the buildings thermal insulation justifies the effect obtained by reducing operational costs as a consequence of lowering heating load. The analysis is performed according to latest international standards and EU directives.