Study of the behavior of a heat exchanger air/ground: Canadian well

The improvement of the energy performance of buildings and the optimization of their design with respect to summer comfort has nowadays become indispensable. canadian or provencal wells fit into this context. the principle of such a well is to circulate fresh ventilation air in a buried conduit with a fan,before injecting it into the building. the case study focuses on a canadian well that has been achieved in a villa in hay riad (rabat),still under construction. several equipments needed for the study of canadian wells and construction of thermal modeling aspects in air conditioning/heating of the house were installed. a series of experiments were performed on the facility to evaluate the performance of the canadian well over an entire year (heating and cooling) as follows: the measurement of changes in soil temperatures at several levels,the extent of outdoor and indoor temperatures,and the gains generated etc. the modeling of the canadian well showed several important features of the evolution of soil temperature and the blowing inside the building. the average temperature and its period remain unchanged in depth; the amplitude of the temperature variation decreases exponentially with depth,this decrease is even faster than the pulse is high,the phase shift increases with depth,and the energy gains are important (gains of 10°c were achieved for a fan power of 100w). an energy balance has concluded that the canadian well adapted well to the city of rabat which also relies on a favorable water table.