Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
桃園機場捷運電聯車空調系統簡介 Introduction to the Air Conditioning System of TIAA MRT EMUs

在正常操作模式下,其控制系統依據車廂內熱負荷要求控制車廂內4個壓縮機啟閉,因此每個車廂中製冷能力分為25%、50%、75%、100%,共四級,用以調整車內至所需的 25±1°C 及相對濕度60%舒適環境。控制系統並有執行所有特定控制與自我測試功能,可將故障與診斷資料可以下載至筆記型電腦,便於維修人員判讀故障及維修。
每組空調單元設有2個新鮮/緊急空氣擋板及1個回風擋板,正常操作模式下新鮮/緊急空氣擋板部份開啟,回風擋板完全開啟,當列車失去牽引供電或因2部空調單元高壓跳脫時,將進行緊急通風模式,此時緊急空氣擋板完全開啟,回風擋板完全關閉,以強制使100% 的新鮮空氣進入車廂內,為了避免車廂內部產生過高風壓,車體之排氣風門會同時打開,將過量的新鮮空氣排出。若車外起火,則進入煙霧模式,新鮮/緊急空氣擋板及車體排氣風門將關閉,回風擋板完全開啟,避免煙霧自車外進入車廂內。

The TIAA MRT Project adopted the Roof-mounted Air Conditioning System for A/C in the EMUs. Every passenger coach is equipped with two A/C units which are located respectively in the front and back end of the ceiling. The A/C unit is weighed 685 kg, equipped with two horizontal compressors and operated through an electrical control panel. The system is installed with normal operation mode, emergence ventilation mode, and smoke mode. It is also equipped with air cooling, air purification, system self-check and system protection functions. Under normal operation mode, A/C power is provided through auxiliary power supply. When encountering power failure, the emergency inverter converts power supply into 110V DC battery power which can perform emergence ventilation for at least 30 minutes.
There are four compressors in each coach which can be controlled to operate according to interior thermal loads. Under normal mode operation, the cooling capability can be adjusted to 25%, 50%, 75% or 100% level by controlling the compressors to provide a most comfortable environment of 25±1°C and R.H. 60%. The control system can also perform all specific controls and self-test functions and auto-save malfunction/ diagnosis records accordingly. The maintenance crew can download the malfunction/ diagnosis records onto their laptops for trouble shooting and maintenance actions.
Every A/C unit is equipped with two Fresh/ Emergence Air Dampers and one Return Air Dampers. Under normal operation mode, Fresh/Emergence Air Dampers are partially opened and the Return Air Dampers is fully opened. When train loses traction power supply or when two A/C units encounter high pressure trip, the system switches to Emergency Ventilation Mode in which Fresh/ Emergence Air Dampers are fully opened and the Return Air Dampers is fully closed to force 100% fresh air into the coach. During Emergency Ventilation Mode, the Exhaust Air Outlet at car body will automatically open to emit excessive air and avoid excessive wind pressure in the coach. When there's a fire outside the coach, the system switches to Smoke Mode in which Fresh/ Emergence Air Dampers and Air Extraction Doors are fully closed and the Return Air Shield is fully opened to avoid smoke into the coach.
The TIAA MRT EMUs adopted R407C refrigerant for the A/C System which is in accordance with Montreal Protocol regulations. The modular design of the A/C system results in faster replacement/maintenance actions and shorter suspension periods for train maintenance. Moreover, the multiple operation modes can provide better service quality and traveling environment for passengers.

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