Systematic analysis on combined heat and water transfer through porous materials based on thermodynamic energy

Akihito Ozaki, Toshiyuki Watanabe, Tetsuo Hayashi, Yuji Ryu

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

A new thermodynamic energy `water potential' based on the principles of chemical potential of an element of mixed gas is defined as the driving force of gaseous phase water flux. Adhesive power or `capillary action' and a portion of the water potential, is confirmed as the driving force of liquid phase water flux. A numerical model of combined heat and water transfer using the water potential is introduced and influences of forces, such as gravity and pressure on water flux are incorporated from the viewpoint of thermodynamics. A way to estimate diffusivities of gaseous and liquid phase water through porous materials is also shown. Accuracy of the numerical model is demonstrated through a comparison between calculation and experiment for different temperature gradients and water content in a porous material.

Original languageEnglish
Pages (from-to)341-350
Number of pages10
JournalEnergy and Buildings
Volume33
Issue number4
DOIs
Publication statusPublished - Apr 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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