The program is designed primarily for building engineers, HVAC engineers and architects.
Understanding French, German, Italian or English is necessary.
Lesosai includes a wizard that allows to quickly modelling a building, ideal for pre-projects and renovation diagnostics.
Several thousands are sold today, mainly in Switzerland, France, Italy, Luxembourg and United Kingdom.
Building envelope elements dimensions and thermal characteristics. The latter can be entered when known, or calculated on the basis of their structure. Occupancy data (defauld values are provided if necessary)
When needed (e.g. for hourly calculations, energy use for lighting and appliances, or room-by-room calculations) internal walls characteristics.
Meteo data and buildign materials characteristics are included in a database.
Also Lesosai imports gbXML file format and works with the BIM logic (Building information modeling)
Building heat balance, energy use for heating, hot water, lighting and other appliances.
Heating power room by room or for the whole building
Official reports on heating energy use for Switzerland, italy, France and Luxembourg.
The developers of Lesosai continually monitor new regulations and standards, and are constantly incorporating new features. The Lesosai user-experience is constantly being optimized to be as quick and easy as possible. The software was developed with support from several institutions and businesses, notably the Solar Energy and Building Physics Laboratory (LESO-PB) of Ecole polytechnique fédérale de Lausanne (EPFL).
Its user interface is user friendly. The basic uses can be learnt in 30 minutes.