초록 ▼

In a compressed air powered refrigeration system for aircraft containing a refrigeration turbine and associated heat exchangers for supplying cool air to the aircraft cabin, air is recirculated from the cabin by a recirculation means and combined with the turbine discharge air to simultaneously melt

In a compressed air powered refrigeration system for aircraft containing a refrigeration turbine and associated heat exchangers for supplying cool air to the aircraft cabin, air is recirculated from the cabin by a recirculation means and combined with the turbine discharge air to simultaneously melt ice present in the turbine discharge and provide cooling to the recirculated air. The lack of ice in the turbine discharge allows the use of an ice-free regenerative heat exchanger, in heat exchange relation with the mixture of the turbine discharge air and recirculated cabin air, to condense moisture from the air entering the turbine. The use of heat from the cabin air to melt ice coupled with maximum utilization of the recirculation means supplying the recirculating cabin air enables the turbine to provide air at a temperature below freezing and results in improved cycle efficiency as well as maximum possible ventilation rate to the load.

대표청구항 ▼

In an air cycle refrigeration system for aircraft receiving pressurized air and supplying refrigerated air to an enclosure; a turbine having an inlet and an outlet, said inlet receiving said pressurized air and said turbine expanding and cooling said air through said outlet; means for recirculating

In an air cycle refrigeration system for aircraft receiving pressurized air and supplying refrigerated air to an enclosure; a turbine having an inlet and an outlet, said inlet receiving said pressurized air and said turbine expanding and cooling said air through said outlet; means for recirculating air at a temperature above freezing from said enclosure to a junction downstream from the outlet of said turbine whereby said recirculated air is mixed with the cool air from said turbine to melt ice present in said turbine outlet and to provide cooling to said recirculated enclosure air; a regenerative condenser connecting, through heat transfer surfaces within said condenser, the pressurized air upstream of said turbine inlet with the cooled air mixture downstream of said junction, said cooled air mixture absorbing heat from said pressurized air and cooling said pressurized air below its dewpoint so that moisture in said pressurized air condenses on said heat transfer surfaces and is made available for removal; and means for supplying said cooled air mixture from said regenerative condenser to said enclosure, the quantity of airflow supplied to said enclosure being equal to the sum of the pressurized air and the recirculated air. A method for cooling an aircraft enclosure from a source of pressurized air comprising the steps of: removing moisture from said pressurized air by heat exchange in a regenerative condenser between said pressurized air and a coolant fluid; expanding said pressurized air, after removal of moisture therefrom, through a turbine to cool said air; mixing air recirculated from said enclosure with said cooled air at the outlet of said turbine so that the resultant air mixture prevents ice in said turbine and cools said recirculated air; passing said air mixture through said regenerative condenser as said coolant fluid; and supplying said air mixture from said regenerative condenser to said enclosure, said air mixture being equal to the sum of said pressurized air and said recirculated air.