Dynamic Characteristics of Fluid Temperature in a Duct of Air Conditioning Systems

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Abstract

Dynamic characteristics of fluid temperature in a duct is discussed in this paper. For a general case where a duct is imperfectly insulated by a heat insulator having a finite thickness, an exact solution of the frequency response is determined and compared with the experimental results obtained by means of frequency- and step-response methods. The experiment is carried out for the case where heated or cooled air flows in a duct with or without a heat insulator. The comparison shows that the experimental values agree well with the theory for various values of duct length and of air flow rate. The dynamic characteristic of fluid temperature is affected remarkably by the material and thickness of duct wall, but little by those of the heat insulator. Moreover, it is confirmed that the dynamic characteristics becomes worse as the air flow rate is smaller, the duct longer, and the heat capacity per unit lenght of duct larger.

Journal

  • Bulletin of JSME

    Bulletin of JSME 15 (79), 73-80, 1972

    The Japan Society of Mechanical Engineers

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