Evaluation model of the steady-state heat transfer performance of two-phase closed thermosyphons

Abstract

Two-phase closed thermosyphons have good thermal conductivity and are widely used in heat transfer applications. It is essential to establish an effective method for evaluating the steady-state heat transfer performance of two-phase closed thermosyphons, as such a method can help to select appropriate designs and to improve the efficiency of these devices. In this paper, the equivalent thermal conductivity is derived by the principle of equal total thermal resistance, in which the influence of the adiabatic length is eliminated. An evaluation model of the steady-state heat transfer performance of two-phase closed thermosyphons is established. Test results of three two-phase closed thermosyphons with total lengths of 220 mm, 320 mm and 500 mm show that as the heat transfer rate increases, the equivalent thermal conductivity of these devices decreases by 28.91%, increases by 6.10% and increases by 10.02%, respectively, among which the minimum value is 831.63 W?m-1?K-1and the maximum value is 1694.19 W?m-1?K-1. The decrease (increase) in the equivalent thermal conductivity in the evaluation model indicates a decrease (increase) in the heat transfer performance. The results show that the equivalent thermal conductivity of the model can effectively evaluate the heat transfer performance of two-phase closed thermosyphons.

Research on the evaluation model of rural colony tourism resources based on AHP

“…With the implementation of rural revitalization strategy, the industrialization of rural tourism will be an inevitable in the future development. In view of this, this paper will make a comprehensive assessment of the factors affecting the development of each indicator of rural tourism resources, and finally analyze the evaluation results and classify the grades, and according to the analysis of the resource evaluation results, and combined with the local tourism resources development policy and development principles, give the development ideas of rural tourism in the region and the corresponding development countermeasures [5] .…”