Techno-Economic Evaluation for the Application of Heat-Reflective Coatings in the Structure of Building Walls

Abstract

Strengthening regulations for the thermal protection of buildings provided by building envelopes (particularly exterior walls) compels design and construction companies to apply new heat-insulating materials. The widespread application of such materials is hindered by the high cost and long payback period. Material characteristics such as durability, minimum installation cost during construction, and the consequent economic effects are equally important. Aim. This study analyzes the problem of insufficient returns when installing heat insulation in building envelopes (exterior walls). Results. It is well established that strengthening regulations for the thermal protection of buildings results in higher costs of heat insulation and consequently longer payback periods. Conventional methods using glass wool, polystyrene foam, and polyurethane can be applied for the heat insulation of building walls-provided the technoeconomic substantiation is sufficiently balanced. This study shows that the payback period for the additional heat insulation of building walls can be up to 25-30 years. Therefore, it is advisable to improve thermal protection of buildings during renovation or refurbishment. This study proposes other approaches to improve the thermal protection of residential and public buildings at minimum cost and to ensure greater returns and shorter payback periods for energy conservation measures.