进风口面积 meaning in Chinese

air-admitting surface

When temperature changed , in order to keep the outlet temperature of the cooling water stable , we can change the areas of draught deflectors , so the speed and area of the draught is changed , which will improve the safety and economy of the running assembling sets with the assumption of economizing water in winter
当外界温度发生变化时，为保证出塔水温不发生变化，可通过改变挡风板面积的方法，使进风口面积及进塔风速发生改变，进而保证出塔水温，保证冷却塔在冬季的正常运行。