Ventilation system for a passenger transit vehicle

摘要

A ventilation system for a passenger transit vehicle that comprises a passenger compartment. The ventilation system comprises a variable speed fan for providing outside air to the passenger compartment, wherein within a given ambient temperature range, the speed of the variable speed fan is controlled such that the air speed produced by the variable speed fan increases with increasing ambient temperature. The ventilation system further comprises a duct system fluidly connecting the variable speed fan to an air diffuser that directs the air from the variable speed fan towards the passengers within the passenger compartment. The cross sectional area of the duct system decreases along its length for providing substantially constant air pressure along its length. The ventilation system is able to provide outside air into the passenger compartment at an air flow speed of greater than 0.15 m/s.

主权项

1. A ventilation system for a passenger transit vehicle, the passenger transit vehicle comprising a passenger compartment, the ventilation system comprising:
a) a variable speed fan for drawing outside air from an air intake located on an exterior surface of the passenger transit vehicle and providing the outside air to the passenger compartment, the speed of the variable speed fan being controlled based at least in part on an ambient temperature and a passenger load, wherein within a given ambient temperature range, the speed of the variable speed fan is controlled such that the air speed produced by the variable speed fan increases with increasing ambient temperature or passenger load; b) an air diffuser positioned within an upper portion of the passenger compartment, the air diffuser comprising a plurality of air outlets directed into the passenger compartment for directing air from the variable speed fan towards passengers that travel within the transit vehicle; c) a duct system fluidly connecting the variable speed fan and the air diffuser, the duct system having a length and a cross sectional area, wherein the cross sectional area decreases along the length of the duct system for providing substantially constant air pressure along the length of the duct system, the air diffuser running substantially along the length of the duct system of decreasing cross sectional area, the length of the duct system of decreasing cross sectional area being positioned within the upper portion of the passenger compartment.