Methodology and results of construction company R&D department in energy efficiency in building

To promote the sustainability the building environment is full of opportunities; in particular in Europe with the energy building performance directive and its adaptationin Spain with the new regulation on energy efficiencyin building (Cdigo Tcnico de la Edificacin: CTE). The work on energy efficiency in building could be held since different point of view. In a construction company it exists 2 ways to encourage energy savings:- Studying the basic project during the phase of competition.This approach lets few time and just permits to give advice but they might be not applied at the execution stage.- Analysing the project at the beginning of the work phase. The clients, most of the time, approve some modifications during the execution of the building. So, the changes to save energy can be consented with the approbation of the architects.The studies follow a logical plan: the analysis of the projected design, the analysis of different more energy efficient solutions and the economical-energetic studyof these proposed solutions. To make the energetic analysis, simulation softwares are used.