Anti-icing heat exchanger for aircraft air cycle performance enhancement
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United States of America Patent
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-
Sep 10, 1996
Grant Date -
N/A
app pub date -
Jan 11, 1995
filing date -
Jan 11, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Unconditioned, sub-freezing turbine exhaust air is employed to cool liquid coolant from radar electronics in an aircraft. This is accomplished by utilizing a liquid/air exchanger. However, in order to ensure that the air-cooled heat exchangers do not experience freezing of moisture droplets, sufficient heat is supplied to a liquid/air heat exchanger, located at the turbine exhaust, to maintain all surfaces (fins) above freezing, and also to heat the entire turbine exhaust air stream to a temperature above freezing as it exits that heat exchanger. Use of this anti-icing liquid/air heat exchanger, in conjunction with the proper air and liquid flow controls, will permit savings of total cooling air (i.e., engine bleed air) flow by negating the need for a hot air bypass to reheat turbine exhaust air.
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