Analysis on the Selection of Working Fluid in the Small Diameter Gravity Heat Pipe - Based on a New Passive Technology

Abstract

This paper discusses the suitable working fluid applying in small diameter (millimeter scale) gravity heat pipe theoretically. The working temperature, characteristics of material, heat transfer limit and thermal physical properties of working medium of the heat pipe were studied. It is concluded that each aspect capability of heat transfer of R717 is excellent, but its working pressure is a bit high; the synthesized capability of R134a is relatively ideal and can be chosen as the working medium.

The applicability of the wall implanted with heat pipes in winter of China

“…1 [30]. The WIHP is constructed by implanting the micro gravity heat pipes in millimeter level [35] on the basis of the common wall, and achieves the regulation of indoor thermal environment throughout the year by automatic adjusting the intelligent valves on the south, west and north external walls. The detailed structure and working principle are illustrated in reference [30].…”