Experimental study of a stand-alone earth to air heat exchanger for heating and cooling in arid regions

Earth to air heat exchanger EAHE is a renewable technique based on geothermal source. Arid regions are characterised by hard winter and summer weather conditions, which lead large thermal discomfort for the big part of year. In this paper, we study experiments performance stand-alone earth-to-air without external devices (fans, etc.), but only with local climatic conditions region Bechar (located in Southwest Algeria). The contains PVC pipe 66 meters length 110 mm diameter, it buried at depth 1.5 m an agriculture zone, where annual undisturbed sub-soil 28°C. has capacity raise temperature 10°C heating regime reduce 11.9°C cooling regime. Furthermore, relative humidity raised by19% humidification reduced 27% dehumidification daily working was: 62.5% (from 00h 08h from 18h 23h) 37.5% 09h 17h) regime, 10h hygrometric presents great potential pre-heating, pre-cooling, natural ventilation dwellings buildings arid regions.