Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
機場捷運車站空調水化學處理設備簡介 Introduction to the Air-conditioning Water Chemical Treatment Equipment in TIAA MRT Station

退伍軍人症第一次被發現於1976年夏天,有4,400位美國賓州退伍軍人協會會員,在貝爾菲史丹佛旅館召開第58屆退伍軍人協會會議時,於該旅館內發生一次大規模呼吸道感染而引起恐慌,此即為「退伍軍人症」之由來。
經研究發現,退伍軍人症之病源體為多形態性短小球桿菌,存在於溫暖潮濕的水或空氣中,例如冷卻水塔、游泳池、飲用水、蓮蓬頭、水龍頭甚至河川、湖泊、沼澤、井水等液體環境皆曾被檢測出。攝氏35-46度為此細菌最佳生長環境,低於攝氏20度即不能增殖,但仍能蟄伏。該桿菌如進入冷卻水塔,除了可在冷卻水塔內繁殖外,在熱交換器內也可生存。在上述案例中,主要污染源為遭細菌污染的大樓空調冷卻水塔,細菌經水蒸氣進入空調系統,再由空氣傳播給會場所有人。
機場捷運車站在規劃時,即設計在水冷式中央空調系統之冷卻水及冰水管路設置水化學處理設備,其功能除了自動監測空調系統水質外,並能在冷卻水及冰水中自動添加化學藥劑,防止微生物及細菌孳生。此設備不但能消滅多形態性短小球桿菌(退伍軍人症病源),亦能防止青苔等微生物滋生,造成管路污染或阻塞,並能將水中各化學成分達到平衡,抑制空調設備管路積垢及腐蝕的發生,以避免降低設備之熱交換率,達到提高空調系統運作效率,減少車站水電支出及延長設備使用壽命與降低維護成本。

The first recognized cases of Legionnaires' disease occurred in the summer of 1976. Among 4,400 attendees of the 58th American Legion Convention held at the Bellevue-Stratford Hotel, the occurrence of a large-scale respiratory tract infection in the hotel caused severe panic. This is the origin “Legionnaires' disease”.
It has been found that the pathogen of Legionnaires' disease is polymorphous bacillus. The bacterium exists naturally in warm and humid water or air, such as cooling towers, swimming pools, drinking water, showerheads and faucets. It is even found in rivers, lakes, swamps, well water and other liquid environments. The bacteria grow best at temperatures between 35 and 46 °C. It cannot proliferate under environment temperature less than 20°C but is still dormant. The bacillus can proliferate in the cooling tower and can even survive in the heat exchanger. In the above case, the main source of bacterial pollution is the cooling tower of the building air conditioning system. The bacteria entered the air conditioning system through water vapor, and were then spread by the air to all the people in the venue.
In the planning stage of the TIAA MRT stations, the water chemical treatment equipment is designed to be installed in the cooling water and ice water pipeline device of the water-cooled central air-conditioning system. In addition to automatic monitoring of air conditioning system water quality, its functions include automatically adding chemicals in the cooling water and ice water to prevent microbial and bacterial proliferation. This equipment not only can eliminate the polymorphic short bacillus (the source of Legionnaires' disease), but also prevents proliferation of moss and other microbial that results in pipeline pollution or obstruction. The equipment can also balance the chemical composition of the water, inhibiting fouling and corrosion occurrences in the air conditioning equipment pipelines in order to avoid reduction of heat exchange rate and to improve the efficiency of air conditioning system operation. This will reduce station water and electricity expenditure and extend equipment life to achieve the purpose of reducing maintenance costs.

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