| 摘要 |
A cooling system for an underground transit system utilises liquid oxygen as the medium in a heat exchanger 3 with unwanted oxygen vented to atmosphere, so as to provide cool oxygen enriched air. The cooled air may be stored under pressure in a pressurised air storage tank 1 for distribution at a pressurised service head 12 where it may be mixed with another gas by means of a servo or computer controlled mixer valve 13. The pressurised oxygen enriched air may be made available at air delivery units that are statically mounted along the length of a transit tunnel. The air delivery units being controlled by a statically mounted computer or dynamically mounted infrared signal sources (16, figure 2/2) upon trains. The air is delivered directly to the carriages of trains via receiver units (15, figure 2/2) when the receiver units (15, figure 2/2) are aligned with corresponding tunnel mounted air delivery units. The receiver units (15, figure 2/2) may feature filters and fan and baffle arrangements (17, figure 2/2) to redirect air flow. There may be 300 air delivery units per kilometre of track. Air may be delivered to train carriages when the train is stationary or moving. Within train carriages there may be provided sensors for monitoring the climate, these may include an oxygen sensor (18, figure 2/1) and a temperature and humidity sensor (19, figure 2/1). The energy used to bring about the transition of liquid oxygen to its gaseous state may be put to use. |
