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Environmental Control System for Light Turbo Prop
ISSN: 0148-7191, e-ISSN: 2688-3627
Published July 07, 2003 by SAE International in United States
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Honeywell has developed a unique environmental control system (ECS) for light turbo-prop aircraft applications. The ECS consists of two integrated systems, an Air Cycle System (ACS) and a Vapor Cycle Cooling System (VCCS). A single controller interfaces with both systems, and provides control by monitoring temperatures within the environment. The valves and fans of the ECS are then adjusted to provide the necessary control to minimise the error between the actual and set temperatures. The controller specifically provides the following functions:
ACS control when selected on by the pilot
VCCS control when selected on by the pilot
Automatic ACS or VCCS control when selected by the pilot
System self test
The compressor used in the VCCS is a new generation compressor:
28Vdc power supply current
Hermetical compressor technology
Brush-less DC motor
Analogical driving speed
This paper will present the design of the hybrid ACS/VCCS environmental control system and notably its unique characteristics - the compressor and control system.