The Laboratory for the study of Thermal and Energy Systems (LESTE) is a research laboratory of the National Engineering School of Monastir located on the university campus of Skanes-Monastir. The laboratory brings together researchers in the fields of Heat and fluid flows, Energy Systems, Energy and Environment and Hydrogen. 

The fields of expertise of LESTE are:

1. The development of means of study (means of measurement, numerical codes) adapted to the various problems of fluid mechanics and energy.
2.  Innovation and advancement in fluid mechanics and heat and mass transfer-related subjects.
3. The creation of a competencies center in the fields of fluid mechanics and energy.
4. Training of the trainers.

Two annual seminars, monthly internal seminars, team meetings, and involvement in the planning of scientific events are significant pillars of integration that increase the laboratory's visibility on a national and international level.