TEMPO

Thermal Exchange Modelling and Power Optimization

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 Obiettivo del progetto (Objective)

'In the frame of the proposed project, a comprehensive Modelica library for the modelling of aircraft air conditioning and thermal management will be developed, covering all relevant fluid domains as well as mechanical, electrical and control aspects. The developed library will cover: Vapour cycle system, including valves, heat exchangers (two phase – two phase, two phase – liquid, two phase – air), reservoirs and refrigerant compressors Air cycle system, including compressor, turbines, air – air heat exchangers, water extractors and sprayers, fans, jet pumps, valves and scoops Liquid loop systems, including piping, pumps, valves, air – liquid heat exchangers and reservoirs 1-D aircraft cabin model, covering 3-D effects backed by experimental validation Air distribution system models e.g. ducting and mixing chamber Electrical and mechanical models including motor drives, bearing losses and mechanical connections System control capabilities and linking the models to external tools The library will be developed using the latest features of the Modelica language for more robust and efficient simulation. Object-oriented modelling and a user-oriented library structure will allow efficient future development and extension of the library. The developed models will fully support multilevel modelling, allowing an easy switching between dynamic and steady state modelling for different design phases. On the basis of this library, a multi-objective optimization strategy will be developed, making full use of the newly created capabilities to model the multi-domain system interdependencies. The multi-objective optimization strategy shall help to find optimum system architectures with respect to the targets of the Clean Sky JTI i.e. minimum environmental impact at minimum overall cost and maximum passenger comfort.'

Introduzione (Teaser)

With the advent of electric aircraft, the thermal management of their equipment has become an imperative consideration. EU researchers are developing an open-source library that will contain components for designing efficient air conditioning and thermal management systems.

Descrizione progetto (Article)

Modelica is an object-oriented language that allows engineers to model complex physical systems including mechanical and electric components. Using the latest features of the Modelica language, the EU-funded 'Thermal exchange modelling and power optimization' (TEMPO) project is developping a library that will support scalable models for aircraft environmental control and cooling systems.

The TEMPO library covers aircraft air conditioning and thermal management systems. Models of these systems can be scaled and modified in order to be used in different phases of the design cycle, without the need to rebuild them or use another software tool.

In the Modelica library, all relevant fluid, mechanical, electrical and control aspects are covered. Considering vapour, air, liquid cycle and loop systems, focus is laid on designing an optimisation strategy to effectively model system interdependencies.

TEMPO members have already defined the requirements for the library structure and introduced the basic design principles. Furthermore, a thin layer of code has been written (in C/C++ programming languages) in order to wrap the fluid data library.

The second reporting period has been devoted to developing dynamic model components to extend the static library. Ultimately, the library will fully support multi-level modelling of systems, and allow easy switching between dynamic and steady-state modelling in different phases of the development process.

Development of an aircraft cabin model has been rescheduled for the next reporting period. TEMPO should result in new software that assembles a scalable model of a basic aircraft environmental control system and configures it for different settings.