Study on grey model in ONB of nature circulation

Grey system theory is applied to analyze the experimental data of onset of nuclear boiling in Freon natural circulation. The magnitude sequence of the factors that have effects on ONB (Onset of Nuclear Boiling) of nature circulation are confirmed as the heating power, inlet quality, liquid temperature, mass flow and pressure. Based on the experimental results, Grey model GM(1,1) and GM(1,4) are established by using the grey theory. The effects of the heating power, inlet quality, liquid inlet temperature and flow on the position of ONB are analyzed by using GM(1,1). Both models can be used to predict the development trend of the experimental data. (author)