Environmental control system holds vital importance as it is responsible for passenger's ventilation and comfort. This paper presents an analytical design of environmental control systems and represents the estimated design in three-dimensional. Knowledge-based engineering application serves as the base for designing and methodology for the environmental control systems. Flexibility in the model enables the user to control the size and positioning of the system and also sub-systems associated

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... th it. The number of passengers serves as the driving input and three-dimensional model gives the exact representation with respect to the volume occupied and dependencies on the number of passengers. It also provides a faster method to alter the system to user needs with respect to the number of air supply pipes, number of ducts and pipe length. Knowledge-based engineering gives the freedom to visualize various options in the conceptual design process.