AIR CYCLE COOLING SYSTEMS

摘要

An open loop air cycle system (10) for delivering a flow of cooling air to an enclosure (11) is described. The system (10) comprises means for delivering a variable flow of cooled air for mixing with recirculated enclosure air in an enclosure air recirculation loop. The system (10) further comprises means for supplying a variable flow of air at ambient temperature and pressure to the enclosure air recirculation loop and means (40) for controlling the flow of cooled air for mixing with the recirculated enclosure air and for controlling the flow of ambient air to the enclosure air recirculation loop such that in operation, substantially constant volume flow of cooling air is delivered to the enclosure (II).