This paper describes some of the unique challenges in balancing the thermal loads in High Altitude Long Endurance (HALE) aircraft. HALE aircraft operate in a low density and a low velocity environment making heat rejection difficult. HALE aircraft must also operate through several diurnal cycles, each creating a unique thermal environment. An optimal HALE aircraft's thermal system requires several novel concepts to overcome these challenges. The paper describes some concepts of minimizing heat loads and of rejecting waste heat effectively. Heat rejection concepts such as; surface heat exchangers, fuel tank heat sinks, and conventional radiators, are discussed relative to their respective merits and weaknesses. Heat sources such as; reciprocating engines, turbochargers, and avionics, are discussed relative to their impact on vehicle performance. Some relative measures of performance are derived that allow HALE system designers to describe sensible integrated concepts.


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    Title :

    HALE thermal balance


    Additional title:

    HALE (Grosse Hoehe-Langzeit-Flugtechnik) thermisches Gleichgewicht


    Contributors:

    Published in:

    AIAA-Papers ; Jul ; 1-7


    Publication date :

    1987


    Size :

    7 Seiten, 12 Bilder, 3 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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