A calculation method for condensers in multi-stage evaporators with non-condensable gases

✍ Scribed by K. Genthner; A. Seifert

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 837 KB
• Volume: 81
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(91)85068-6

✦ Synopsis

The effect of non-condensable gases on the performance of a cylindrical tube sheet condenser was Investigated with the aim to provide an analytical tool for cases that do not permit a complex numerical calculation.

The data required to develope this method, i.e. the local distribution of heat transfer, gas concentrations and saturation temperatures inside the tube bundle, were determined by subdividing the condenser into a system of radial shells and axial segments. These elements were numerically treated as a two-dime~ional system of heat exchangers, linked radially by the vapour path and axially by the brine flow. Some representative results are presented in this paper. One essential deducatron from this material was, that for a given NC gas concentration in the vapour, the relation between the totat heat flux in a condenser with NC gases to that of the pure vapour case is closely enough tdentral over the fuli range of stages in an MSF distiller. This relation is essentially a function of the NC gas concentration. Once this relation is established from the detailed computatrons, the complex NC gas condenser problem can be reduced to a calculation for pure vapour and an application of the approprrate correction terms.