A SIMPLE MODEL FOR STEAM ABSORPTION INTO AQUEOUS LITHIUM BROMIDE
Absorption chillers for room air-conditioning normally operate on water as refrigerant and lithium bromide as absorbent. Since the absorber is often considered to be the most critical component of an absorption machine, it is crucial to have a closer look on the ongoing processes there. Unfortunately the coupled heat, mass and momentum transfer does not allow a complete analytical solution of the problem. In this paper a simplified model for laminar falling-film absorption on a horizontal tube is proposed.The model combines the features of the Nuβelt theory for heat transfer, of a semi-infinite one-dimensional body for mass diffusion and uses the condition of phase equilibrium at the film surface.The model has been compared against experimental data and shows only fair agreement in heat transfer coefficient but good agreement in mass transfer coefficient. The results are discussed and possible improvement is outlined.
A.Wohlfeil F.Ziegler
TU Berlin, KT 2, Marchstr. 18,10587 Berlin, Germany
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）