Raschet i analiz dinamiki rosta tolshchiny sloya vodnogo ineya na okhlazhdaemoy poverkhnosti

When refrigeration and cryogenic equipment operates a frost layer formation takes place on cold surfaces that are turned towards humid air. A frost thermal resistance impacts negatively on the heat transfer. A general decrease of efficiency is also linked with the blocking of the air flow passage that leads to the increasing hydraulic resistance and reducing the working fluid boiling temperature. As for the refrigeration equipment the case of interaction of humid air at nearzero and negative temperatures with the surfaces at temperatures below the air average temperature is of the most practical importance. The analysis of empirical and semiempirical correlations describing the nonstationary process of frost layer increase was carried out, and it allowed choosing those that showed the most reliable results for refrigeration equipment, in particular, when calculating thermal conditions of chamber devices of cooling. Also the mathematical models with analytical solution as a method of description of the process of the frost layer increase at the large range of temperatures and air humidity were examined. The firstpriority were admitted the models with solution in a compact and easytouse form for engineering calculations. The comparison of calculation results using these models with experimental data and the estimation of their validity based on the coefficient of determination were given as well.

иней, соотношения для определения роста толщины слоя инея, математические модели, тепломассообмен в камерных приборах охлаждения