Respirable cold air supplying device for person moving in e.g. transfer tunnel, has primary circuit supplied with cold air, and secondary circuit with outlet supplying respirable cold air flow at pressure greater than atmospheric pressure

摘要

The device (18) has a heat exchanger (34) composed of a primary circuit and a secondary air passage circuit (36), where the device is in the form of a small backpack or bag. The secondary air passage circuit has an inlet supplied with cold air by a pressurized air source. The primary circuit is supplied with the cold air by a cold outlet (32) of a Ranque tube (30). An outlet of the secondary circuit supplies a respirable cold air flow at the pressure greater than the atmospheric pressure.