The BMS-707035 consumption of buildings accounts for approximately 40% of the total amount of energy used in a country. This energy is mainly used in the heating, ventilation and air conditioning systems. Thus, installing devices based on the renewable sources of energy available for buildings is an interesting alternative to reduce the consumption of electricity and conventional fuels, and therefore to lower emissions of greenhouse effect gases.
Solar energy has been used traditionally throughout solar collectors, converting the solar radiation absorbed in thermal energy using a storage fluid or in electricity using photovoltaic panels. Solar energy is also usually transferred to the inner spaces directly through the building windows and through the façade walls by conduction heat transfer. However façades walls are traditionally designed to insulate the inner space from the environment in the winter so the solar radiation that is absorbed by the external surface of the façade is normally transferred to the ambient air by convection and long wave radiation interchange. The traditional way of using the solar energy to heat indoor spaces in the winter is by letting the solar radiation go in through transparent layers, mainly windows or glazed panels. However, high glazed façades have a high risk of overheating in the summer season, mainly in hot and dry climates.