題組內容

Problem 3 (20 points)
In India, water coolers are a common alternative to air conditioners. The simplest version of such a cooler, as illustrated in the right figure, is by forcing the warm air through a box filled with straw wetted by water. The temperature of air passing through the box can be lowered for more than 10℃ at appropriate condition.
6202303e331c8.jpg

(1) Please explain the working principle of this cooler. (5 water out points)