The invention discloses a passive evaporative cooling and ventilation cooling
system combined with a building. The
system comprises multiple downward ventilation type evaporative cooling towers located in the building. Each downward ventilation type evaporative
cooling tower is vertically arranged, and the top of each downward ventilation type evaporative
cooling tower penetrates out of a roof ofthe building. An air inlet is arranged on the segment, penetrating out of the roof of the building, of each downward ventilation type evaporative
cooling tower by a circle. A spraying device and a direct
evaporative cooler are sequentially arranged on each downward ventilation type evaporative cooling
tower located in the building from top to bottom. An air supply opening is formed in the wall, corresponding to the corresponding direct
evaporative cooler, of each downward ventilation type evaporative cooling
tower. According to the passive evaporative cooling and ventilation cooling
system, the
passive ventilation cooling technology and the evaporative cooling technology are combined with the building, indoor ventilation can be enhanced, and meanwhile the processes of cooling, humidification and purification can be effectively achieved on air; the indoor temperature is adjusted to a proper temperature through low
energy consumption, and environment protection is achieved; and the manufacturing cost and the
operating cost are low, and
natural energy is reasonably utilized.