Earth-Air Heat Exchangers for Passive Air Conditioning: Case Study Burkina Faso

An earth-air heat exchanger (eahx), also known as an earth tube heat exchanger or canadian well, is a system for cooling and heating buildings using the ground as a heat sink/source. this study examines the ground temperature gradient and the performance of an eahx performance in burkina faso. ground temperature measurements were made at depths of 0.5 m, 1.0 m and 1.5 m. at the hottest time of the day, 15:00, the average outside temperature was 39.0°c, but the average temperature 1.5 m underground was 30.4°c. a clear phase shift was observed between the maximum outside temperature and the maximum ground temperature: the time of the day when the outside temperature is highest corresponds to the time when the underground temperature was lowest. the eahx was 25 m long, 1.5 m underground and used a 95 m3/hr ventilator. it was able to cool the air drawn in from the outside by 7.6°c.