Abstract
Analysis of competing options for the implementation of the system is a key task at the stage of conceptual design of aviation air conditioning systems as these systems have a great impact on the fuel efficiency of the entire aircraft. The decision about choice of competing options regarding not only the appearance of the system, but also a lot of different parameters including technical, technological and so on. In case of conceptual design missing parameters for a complex criterion can be replaced by an alternative risk level estimate. This article shows an example how to compare competing variants of the air management system at the stage of conceptual design and provides a methodology for selecting the key parameters of the comparison criterion. As a result, it is shown that vapor cycle cooling is more promising due to the wide possibilities of reducing the mass of components and increasing the overall cooling efficiency. For the air cycle, most of the possible solutions to increase efficiency have already been implemented now.
Highlights
The flights of modern aircrafts occur at high altitudes and speeds that forms high demands to safety and comfort of crew and passengers
The decisions which, determine energy efficiency of system should already be developed at the stage of the conceptual design (Gate 2 according to the model Stage-Gate)
Achievable level of efficiency increment is a parameter that considers the possibility of improving the efficiency of the option due to its optimization. The value of this parameter will objectively be at vapor cycle due to the wide possibilities to reduce the mass of components and to increase the overall efficiency of the cooling installation
Summary
The flights of modern aircrafts occur at high altitudes and speeds that forms high demands to safety and comfort of crew and passengers. One of the ways to achieve safety and comfort records is to improve on-board environmental control system (ECS) [1]. Modern aircraft consists of many subsystems that influence on its flight characteristics. The environmental control system is one of the main on-board systems in terms of this influence. The ECS‘s installation mass reaches 2% of aircraft take-off mass, the ESC‘s fuel consumption is up to 4-6% of aircraft‘s fuel reserve [2,3]
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