o the filler cap this space, this section of the water temperature is higher, so still could be used to transmit heat to the air.?(2) packing water and air heat exchange.?(3) packing and collecting basin space pour water, cooling water in the section called "end effect". In which is 1-2 ℃ lower water temperature in the north of China. Above all, reflux than cross-flow towers in the same situation, packing small volume by abou 20%, countercurrent tower more reasonable cold high efficiency heat