This contribution is focused on the issue of the application of energy-saving measures in the construction of new residential properties and their optimal combinations with regard to the life-cycle costs of these buildings. The aim of the research is to create a methodological basis for considering the economic and financial impacts of various combinations of energy-saving measures, aiming at the optimization of these measures and the sustainability of developer projects. The research methodology is based on the principle of building life-cycle costs, which serve as a key criterion for the process of choosing the optimal combination of energy-saving measures and for comparing a conventional solution with an innovative solution including the application of energy-saving measures. The result of the research is the methodological approach for the design of technologically proven combinations of energy-saving measures, which will lead to optimization of the life-cycle costs with regard to the reference variant represented by a conventional solution. This approach is subsequently verified on three case studies of residential properties with a proposal for the optimal combination of energy-saving measures in the form of photovoltaic panels and a water-air heat pump. The added value of the paper consists of the possibility of optimizing the building construction project from the point of view of energy-saving measures already in the design phase.
The paper deals with the refinement of the Cost-Benefit Analysis methodological procedure for the assessment of the economic effectiveness of large-scale transport infrastructure projects. The basic input is economic Cash Flow which consists of investment costs, operating income, operating expenses, societal benefits, and harms as well as the investment residual value. According to the methodological guidelines, the currently evaluated project period is considered to be 30 years including the investment phase starting in the first year of the construction, the relevant part of the operational phase, and the residual value of the project in the last year of the assessed period. The evaluation of the economic effectiveness of projects is largely influenced by the determination of the construction economic life. A procedure for calculating the residual value of the project while respecting the gradual implementation of partial constructions was established as part of the research. A case study based on the research sample of several investment construction projects of the highway sections in the Czech Republic demonstrates how this methodological procedure affects the economic effectiveness of the project.
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