Numerical Study on Self-insulated Gas-to-gas Heat Exchanger

DOI HANDLE Web Site Open Access
  • Tomimura Toshio
    Institute of Advanced Material Study Kyushu University
  • Wu Ping
    Interdisciplinary Graduate School of Engineering Sciences Kyushu University
  • Fujii Motoo
    Institute of Advanced Material Study Kyushu University
  • Echigo Ryozo
    Shibaura Insutitute of Technology

Bibliographic Information

Other Title
  • 自己断熱型ガスーガス熱交換器の数値解析
  • ジコ ダンネツガタ ガスーガス ネツ コウカンキ ノ スウチ カイセキ

Search this article

Abstract

A new self-insulated gas-to-gas heat exchanger is proposed on the basis of the effective energy conversion method between flowing gas enthalpy and thermal radiation. The present heat exchanger consists of three porous media separated by two solid walls. A high temperature (heating) section is put between low temperature (cooling) and heat recovery sections, and this arrangement enables the heat exchanger to be self-insulated. Atheoretical analysis is conducted for one-dimensional system. Three sets of coupled energy equations for gas and porous media are solved numerically under the conditions of the inlet gas temperature of the high temperature section T_<gho>=400～1600℃, the optical thickness τ_o=1.25～5.0, the mean working gas velocity u_m=0.15～0.6m/s and the emissivity of the separating wall ε=0.5～1.0. The temperature distributions of each section and the separating wall temperatures are demonstrated, and it is shown that the side wall temperature of the heat recovery section can be maintained at low temperatures (about 50℃ at the highest) for τ_o=2.5～5.0. Furthermore, the present heat exchanger is shown to exhibit high overall heat transmission coefficients.

Journal

Details 詳細情報について

Report a problem

Back to top