IIR document

A state-space representation of the dynamic model of air temperature distributions.

Summary

Knowing the dynamic behaviour of the air temperature in air-conditioned rooms is important. The steady-state flow field and temperature distribution can be calculated by computer fluid dynamics (CFD) programs. To study the dynamics (in order to control the temperature or to know the response with time in different places) is prohibitively time consuming if CFD programs are to be used. For certain ranges of inlet temperature, the flow field could be considered as fixed. The output of CFD (the static flow field) can be used to achieve a state space model of the dynamic response of the air temperatures at various places in the room. The dynamic calculations can be then carried out much faster. In fact, this idea is accomplished through combining two softwares, PHOENICS for the CFD and MATLAB for control. Moreover, a lot of programs (toolboxes) specially designed for system analysis and controller design are available in MATLAB.

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Pages: 790-796

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Details

  • Original title: A state-space representation of the dynamic model of air temperature distributions.
  • Record ID : 1996-1094
  • Languages: English
  • Source: For a Better Quality of Life. 19th International Congress of Refrigeration.
  • Publication date: 1995/08/20
  • Document available for consultation in the library of the IIR headquarters only.

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