Measurement of ground temperature for cooling houses in the locality of hêvié in abomey-calavi (Benin)

The present work consists of determining the geothermal resource of the locality of Hêvié, in the municipality of Abomey-Calavi, in the Republic of Benin, for the conditioning of individual houses. The study area is characterized by a hot and humid climate. To do this, the evolution of the temperature in the underground between 0m and 10m depth was determined. Three sites were then chosen for temperature measurements. At each site, ten holes of depth 1m, 2m, 3m, 4m, 5m, 6m, 7m, 8m, 9m, and 10m were drilled. Temperature sensors were installed in the different holes to measure the temperature every hour for 8 months (February to September). The results of these various measurements show on the one hand that the temperature at each depth remains practically constant all the time. On the other hand, the temperature varies according to the depth. From 0m to 5m depth, the temperature decreases from 32 °C to 28.2 °C with a gradient of -0.78 °C/m. From 5m to 10m, the temperature begins to increase but does not appear monotonous. From these results, it is then possible to use the geothermal resource at 5m depth to condition the air of the premises in the locality for the thermal comfort of the users while taking into account the effect of air speed on the perceived temperature.