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Pneumatically driven environmental control system in aircrafts based on a vapor compression cycle.

Number: pap. 2317

Author(s) : GOLLE S., HESSE U., KLIMPEL F.

Summary

The environmental control system is an essential subsystem of an aircraft, which has to achieve some vital tasks. These include the setting of the desired temperature, humidity and cabin pressure, as well as ensuring the fresh air or oxygen supply and air quality. The requirements must be achieved at very different ambient conditions. This refers to the environmental conditions in the flight and ground cases, and also to the different climatic zones. In addition, the existing interfaces to the aircraft must be taken into consideration. State of the art in currently used commercial aircrafts is an environmental control system, which is based on the air cycle and is driven by bleed air from the engine. This technology allows only a significantly lower coefficient of performance for the given boundary conditions compared to a vapor-compression refrigeration system. Therefore the potential application of the vapor cycle in the aircraft air conditioning system is investigated in a research project with the cooperation partner Airbus. The new system has to be developed as a replacement of the existing air cycle system (retrofit). In a detailed simulation model the thermodynamic state variables are calculated for every element and different operating cases. The calculation results are then used to investigate and size the main components, e.g. heat exchangers and turbo-machines. After the optimization of the system parameters and the individual components the new system is compared with the existing system. The benchmark shows a considerable decrease of about 26% bleed air mass flow for the reference case on the ground and 28% for the operating case in flight, both at hot ambient conditions.

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Pages: 9 p.

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Details

  • Original title: Pneumatically driven environmental control system in aircrafts based on a vapor compression cycle.
  • Record ID : 30013307
  • Languages: English
  • Subject: Environment
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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