Turbine engine with anti-ice valve assembly, bleed air valve, and method of operating

A gas turbine engine comprising:

• an engine core having an inner housing containing a fan assembly, a compressor section, a combustion section, and a turbine section;
• a nacelle anti-icing system configured to tap compressed air from the engine core to a portion of a nacelle to define a flow of hot bleed air, wherein the hot bleed air is a first temperature;
• and
• an anti-ice valve assembly comprising:
• a valve element housing defining a flow path;
• a valve element disposed in the flow path configured to control the flow of hot bleed air to the nacelle;
• and
• a servo controller comprising:
• a servo housing forming a portion of the servo controller;
• a muscle air passage extending through the servo housing and fluidly coupled to the flow of hot bleed air;
• a cooling air passage extending through the servo housing, wherein a cooling air is at a second temperature that is less than the first temperature;
• and
• a heat exchanger located within the servo housing, and having heat transfer surfaces in thermal communication with the muscle air passage and the cooling air passage and wherein heat is transferred from muscle air within the muscle air passage to cooling air in the cooling air passage by the heat transfer surfaces to effect a cooling of the muscle air and define a third temperature muscle air stream, wherein the third temperature is less than the first temperature and greater than the second temperature, wherein the servo housing defines a cavity that houses the heat exchanger, and wherein the cavity is formed at least by a first wall of the servo housing extending from a second wall of the servo housing to a third wall of the servo housing, the second and third walls being horizontal walls.

A method of operating an anti-ice valve, the method comprising:

• supplying a flow of hot compressed air to the anti-ice valve;
• diverting a portion of the flow of hot compressed air to form a flow of muscle air;
• and
• passing the flow of muscle air through a compact heat exchanger having dense finned surfaces, while supplying cooling air to a portion of the compact heat exchanger that is fluidly separate from the flow of muscle air to extract heat from the flow of muscle air to define a flow of cooled muscle air;
• wherein the compact heat exchanger is located within a servo housing of the anti-ice valve, the servo housing forming a portion of a pneumatic servo controller, wherein the servo housing defines a cavity that houses the heat exchanger, the dense finned surfaces being inside the cavity, and wherein the cavity is formed at least by a first wall of the servo housing extending from a second wall of the servo housing to a third wall of the servo housing, the second and third walls being horizontal walls.