Transport phenomena through porous screens and openings : from theory to greenhouse practice

A.A.F. Miguel

Research output: Thesisexternal PhD, WU

Abstract

The study of transport phenomena in multi-zone enclosures with permeable boundaries is fundamental for indoor climate control management. In this study, aspects concerning the air exchange through porous screens and openings, and heat transfer between the enclosure surface and inside air, were analysed. Basic physical laws were the starting point during the construction of the models. To illustrate the practical side of the research performed, the formulation developed was applied to the study of convective heat exchange within screened greenhouses, as well as to the study of airflow through greenhouse screens and window apertures.

Concerning the airflow through porous screens and window openings, the results obtained thoroughly demonstrate the importance of inertia and viscous effects, as well as window openings' geometry effects, on fluid flow. The airflow characteristics of porous screens and the structure of fluctuation of wind velocity, were quantified.

Regarding the study of free convection heat transfer within a screened greenhouse, the convective heat transfer coefficients between the air and the downward and the upward surfaces of the screen were obtained, among other results.

The results obtained from this study can greatly contribute, in general, to a better climate control management of multi-zone enclosures, and specifically, to an improved application of porous screens and window apertures.

Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • Bot, G.P.A., Promotor, External person
  • Silva, A.M., Promotor, External person
Award date25 Feb 1998
Place of PublicationWageningen
Publisher
Print ISBNs9789054858478
DOIs
Publication statusPublished - 25 Feb 1998

Keywords

  • thermodynamics
  • heat
  • heat transfer
  • thermal conductivity
  • transmission
  • mass transfer
  • greenhouses

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