# 逆流跟橫流的英文翻譯第三段(急)

The counterflow tower requires an additional 4 to 6 ft of pumping head for the low-pressure water distribution spray system；however, the total pumping head requirement is still significantly less than it is for crossflow designs.

Recirculation－The fan draws air through the entire louver face of a crossflow tower; therefore, a pressure differential is created along the vertical plane of the structure. Air entering the upper sections is closer to the fan and travels through the tower at a higher velocity than air at lower levels. Bernoulli’s theorem states that when the velocity of a fluid(air) is increased, its pressure is decreased; this effect produces negative pressure at the upper levels of the cooling tower and, under typical atmospheric wind conditions, sets up air recirculation, Fig.5 Hot moist air with a high wet-bulb temperature is pulled back into the cooling tower, which greatly reduces its performance.

The air-intake louvers of a counterflow tower are near the base, a considerable distance from the fan discharge plume, so it is difficult for air to recirculate under normal conditions. Counterflow towers can have recirculation problems if the discharge plume hits a barrier adjacent to the fan outlet, which forces the hot moist air downward. This problem can be avoided by installing an elevated fan cylinder to discharge the air above the barrier.

### 1 個解答

• NENE
Lv 4
1 0 年前
最佳解答

The counterflow tower requires an additional 4 to 6 ft of pumping head for the low-pressure water distribution spray system；however, the total pumping head requirement is still significantly less than it is for crossflow designs.

為讓低壓的水分配噴灑系統在逆流塔需要一個額外的4至6英尺的泵頭，但總需求泵頭抽水仍大大低於它的橫向設計。

Recirculation－The fan draws air through the entire louver face of a crossflow tower; therefore, a pressure differential is created along the vertical plane of the structure. Air entering the upper sections is closer to the fan and travels through the tower at a higher velocity than air at lower levels. Bernoulli’s theorem states that when the velocity of a fluid(air) is increased, its pressure is decreased; this effect produces negative pressure at the upper levels of the cooling tower and, under typical atmospheric wind conditions, sets up air recirculation, Fig.5 Hot moist air with a high wet-bulb temperature is pulled back into the cooling tower, which greatly reduces its performance.

再循環，風扇透過橫流塔的整個百葉窗表面抽取空氣; 因此，壓差沿著結構的垂直平面而產生。空氣進入上層部份而更接近風扇，並且比在較低的水平下穿過塔而速度更高。伯努利定理指出:當速度的流體（空氣）增加，其壓力下降;這一效應產生的負面壓力，在冷卻塔較上方的高度，並根據典型大氣風的條件下，建立了空氣再循環(逆環流)，圖5: 具有高濕真空管溫度的熱濕空氣會回落到冷卻塔，可大大降低其性能。

The air-intake louvers of a counterflow tower are near the base, a considerable distance from the fan discharge plume, so it is difficult for air to recirculate under normal conditions. Counterflow towers can have recirculation problems if the discharge plume hits a barrier adjacent to the fan outlet, which forces the hot moist air downward. This problem can be avoided by installing an elevated fan cylinder to discharge the air above the barrier.

逆流塔的空氣通風口百葉窗板靠近基部，離風扇放電柱有相當的距離，因此空氣很難在正常情況下逆循環。逆流塔有可再循環的問題，如果放電柱撃中鄰近柵欄的風扇出口，迫使熱潮濕的空氣下降。可藉由安裝高架風扇柱，而從柵欄上方排放空氣，以避免這個問題。

參考資料： 自己 請求不要輕易的移除問題,拜託囉!!!