초록 ▼

In a normal mode, a primary heat exchanger for heated bleed airflow is situated upstream of an aircraft air conditioner compressor. A secondary heat exchanger is located downstream of the compressor. In response to hot and humid environmental conditions, three-way switching valves reposition the pri

In a normal mode, a primary heat exchanger for heated bleed airflow is situated upstream of an aircraft air conditioner compressor. A secondary heat exchanger is located downstream of the compressor. In response to hot and humid environmental conditions, three-way switching valves reposition the primary heat exchanger downstream of the compressor. The result will be the reduction of heat exchange exit temperature, which translates into lower turbine inlet and outlet temperatures at satisfactory airflow rates.

대표청구항 ▼

An air cycle switching apparatus comprising: a bleed source of airflow; first and second heat exchangers for cooling the airflow; means for compressing the airflow; and valve means responsive to temperature for switching the position of the heat exchangers relative to an input of the compressing mea

An air cycle switching apparatus comprising: a bleed source of airflow; first and second heat exchangers for cooling the airflow; means for compressing the airflow; and valve means responsive to temperature for switching the position of the heat exchangers relative to an input of the compressing means wherein a first state of the valve means connects the first heat exchanger upstream of the compressing means while the second heat exchanger resides downstream thereof, and a second state wherein the first and second heat exchangers both exist downstream of the compressing means; turbine means having its intake connected to an outlet of the secondary heat exchanger; and means for delivering cooling airflow from an outlet of the turbine means to a utilization point, the airflow being finally cooled as a consequence of expansion in the turbine means.