The Level Of Ring-fin Tube Condensation Heat Transfer Of Tfe

A detailed investigation on the condensation heat transfer of the condenser of the novel absorption refrigeration unit, which is provided by Japanese Sanyo Group is carried out in this thesis. Mechanism of the condensation heat transfer is highlighted when TFE-NMP is used as the working pair in the condenser. Through analysis, the theoretical solution of the condensation heat transfer coefficient of horizontal tubes with annular fins is obtained. The theoretical results are compared with the experimental ones.Firstly, based on Nusselt's theory, a three-dimensional coordinates model is built to deal with condensation heat transfer on the side of the fin. With the model, the condensation heat transfer mechanism on the side of the fin is analyzed. As a result, an integral expression is obtained to calculate the condensation heat transfer coefficient on the side of the fin. The results are compared with that of conventional solution. Based on the above deduction, the numerical solution of the condensation heat transfer coefficient outside horizontal tubes with annular fins is obtained. Secondly, the experiment is introduced in detail and the correlation of the experimental values is given. And last, the experimental data are treated by using a program, and a comparison between the theoretical and the experimental results of the condensation heat transfer coefficient outside horizontal tubes with annular fins is conducted. According to the results, the cause of the error is explained, and the ways of improvement of condenser are put forwardThe theoretical solution of the condensation heat transfer coefficient is in excellent agreement with the experimental one. Therefore it can be applied to the design of a condenser. The experimental results can be employed as a reference for the further research of the same sorts of absorption refrigeration units using TFE-NMP as the working pair.