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Analytical characterisation of amplitude-dampening and phase-shifting in air/soil heat-exchangers.

Author(s) : HOLLMULLER P.

Type of article: Article

Summary

This article presents the complete analytical solution for the heat diffusion of a cylindrical air/soil heat-exchanger with adiabatic or isothermal boundary condition, submitted to constant airflow with harmonic temperature signal at input. It was shown that, depending on its thickness, the soil layer will induce either one of two kinds of amplitude-dampening and phase-shifting regimes of the periodic input signal. In particular, for a thin layer submitted to adiabatic boundary condition, it is possible to completely phase-shift the periodic input while barely dampening its amplitude, a phenomenon apparently unexploited until now, which might give rise to interesting energy handling techniques. Analytical results were validated against a finite-difference numerical simulation model as well as against an experimental setup.

Details

  • Original title: Analytical characterisation of amplitude-dampening and phase-shifting in air/soil heat-exchangers.
  • Record ID : 2004-1651
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 46 - n. 22
  • Publication date: 2003/10

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