The thermal behaviour of a building is often underestimated or neglected during its construction and operation stages. In recent years, the heat flux meter (HFM) method has been commonly used to determine the U-value, a key parameter for assessing the thermal quality of the building envelope in steady-state conditions. However, this non-invasive test takes at least 72 h to execute, the accuracy is
14–28%, and it is not reliable for non-homogeneous building elements. An alternative technique is based on infrared thermography (IRT). Although it is generally used for qualitative analysis, quantitative internal IRT methods may also be adopted for in-situ measurement of the U-value. This research presents
a method for determining in-situ U-values using quantitative internal IRT with a deviation of 1–2% for single-leaf walls and 3–4% for multi-leaf walls. It takes 2–3 h and can be used to provide information about the building envelope for the future refurbishment of existing buildings or to check the thermal behaviour of new building façades according to their design parameters.
Buildings in Europe are responsible of 40% of the final energy consumption. With the aim to
accomplish the European 20/20/20 targets, buildings play an important role. Moreover, public buildings
should exemplify the best practices in terms of energy efficiency. In this context this paper describes an
energy management system for buildings developed in the GESTENSIS project. The system is composed by 5
modules that give tools to building managers to optimize the energy consumption. The building managers
have a set of metrics to understand how their building is working and to know if the building performance is
decreasing. The system also supports building managers in their daily building operation, optimizing the
different types of spaces (corridors, lecture rooms and PC rooms). The system also helps building managers
to carry out maintenance activities. It is expected to reduce 15.26 % of the gas consumption and 37.59 % of
the electricity consumption.