Experimental Study on Condensation Heat Transfer Characteristics of Vertical Surface Chromium-Plated Tube With Condensate Gas

An experimental research on the condensation heat transfer characteristic of surface chromium-plated tube was put forwards with non condensation gas. The experimental result suggests that the factors of pressure, air mass fraction and wall subcooling affect the condensation heat transfer process of surface chromium-plated tube, which is similar to that of stainless steel tube. In addition, by comparing with the stainless steel tube, the chromium-plated tube condensation heat transfer capacity changes more obviously with the variation of air mass fraction. That is to say, under the low air mass fraction condition, due to the existence of non condensation gas layer, the difference between those two tube-types is little; but under the high air mass fraction condition, the condensation heat transfer capacity of surface chromium-plated tube is higher than stainless steel tubes lightly. At last, by fitting the experimental data, the empirical formula of condensation heat transfer of surface chrome-plated tube under the condition of non condensing gas is obtained. The deviation is less than 20%.