Experimental study on solar chimney-earth-air heat exchanger in high temperature and high humidity zones in summer

A full-scale experimental platform is built. By testing the changes of parameters such as ventilation volume, air temperature, air relative humidity, buried pipe cooling capacity, collector surface temperature and solar irradiance within 24 hours, the ventilation and cooling capacity of the coupled system of earth-air heat exchanger (EAHE) and solar chimney in high temperature and high humidity environment is studied. The results show that although the inlet air temperature and relative humidity of EAHE are 27 to 41 ℃ and 42.18% to 95.58%, respectively, the outlet air temperature and relative humidity are relatively stable, which are 27 to 28 ℃ and 90% to 95%, respectively. The maximum temperature drop of the air passing through the EAHE buried pipe is 13 ℃, and the maximum moisture content reduction value is 3.1 g/kg. The maximum total cooling capacity of EAHE is 994 W, the maximum sensible heat cooling capacity is 750 W, the maximum latent heat cooling capacity is 317 W, and the maximum latent heat cooling capacity accounts for about 32% of the total cooling capacity. The maximum ventilation capacity of the system is 166 m3/h, and the corresponding maximum solar irradiance is 1 194 W/m2. The coupled system has good cooling performance in high temperature and high humidity zones.