The porous pipes with high water soaking-up ability have been combined for evaporative cooling wall. Due to the influences of the temperature and humidity outside

the evaporative cooling occurs on the porous pipe surface

which connects with the temperature and its gradient as well as the moisture content and its gradient in the porous pipe

and the temperature drop of 5—8℃ can be achieved in the experiment. The water sucked up by the porous pipes causes the continuation of the evaporative cooling. As the wind speed coupled with the relative humidity influences the evaporative cooling

the temperature drop of 2℃ on the pipe surface can be obtained at 2.5 m·s-1 than that at 1 m·s-1. The rise of gaseous phase in the porous pipe leads to the reduction of the evaporative area. The experiments have also been conducted to study the water soaking-up performance of the porous pipe and the influence of the porous pipe arrangement on the cooling of the combined wall.