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過于潮濕的空氣會(huì)導(dǎo)致冷凝和身體不適等問題。除濕方法通過冷卻盤管或吸附裝置循環(huán)潮濕空氣。只有在冷卻季節(jié)才需要除濕。在這些應(yīng)用中，冷卻系統(tǒng)可以設(shè)計(jì)為提供除濕和冷卻。對(duì)于除濕，冷卻盤管的容量和表面溫度必須足以將空氣冷卻到露點(diǎn)以下。冷卻空氣使水凝結(jié)，然后收集并排出。當(dāng)濕度達(dá)到臨界值且冷卻系統(tǒng)用于除濕時(shí)，可重新加熱除濕空氣，以保持所需的空間溫度。當(dāng)冷卻盤管不能充分降低含水量時(shí)，應(yīng)安裝吸附裝置。吸附裝置使用硅膠、活性氧化鋁或吸濕鹽的旋轉(zhuǎn)顆粒床（圖12），或氯化鋰鹽水或乙二醇溶液的噴霧。在這兩種類型中，吸附劑材料從空氣中吸收水分，然后飽和吸附劑材料通過裝置的單獨(dú)部分，該部分加熱以去除水分。吸附劑材料將水分釋放到“清道夫”氣流中，然后將其排出。掃氣空氣通常是排氣，也可能是室外空氣。
Air that is too humid can cause problems such as condensation and physical discomfort. Dehumidification methods circulate moist air through cooling coils or sorption units. Dehumidification is required only during the cooling season. In those applications, the cooling system can be designed to provide dehumidification as well as cooling. For dehumidification, a cooling coil must have a capacity and surface temperature sufficient to cool the air below its dew point. Cooling the air condenses water, which is then collected and drained away. When humidity is critical and the cooling system is used for dehumidification, the dehumidified air may be reheated to maintain the desired space temperature. When cooling coils cannot reduce moisture content sufficiently, sorption units are installed. A sorption unit uses either a rotating granular bed of silica gel, activated alumina or hygroscopic salts (Fig. 12), or a spray of lithium chloride brine or glycol solution. In both types, the sorbent material absorbs moisture from the air and then the saturated sorbent material passes through a separate section of the unit that applies heat to remove moisture. The sorbent material gives up moisture to a stream of “scavenger” air, which is then exhausted. Scavenger air is often exhaust air or could be outdoor air.
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