Experimental Study on a Facade-Built-in Two-Phase Thermosyphon Loop for Passive Thermo-Activated Building System

Abstract

A novel facade-built-in thermosyphon loop (TPTL) for passive thermo-activated building system was proposed in this paper. The feasibility and effect of the filling ratio as well as the heat source temperature on the operation performance were investigated through the experimental method. Results show that the filling ratio has a great impact on the performance of the facade-built-in TPTL. There exists an optimal filling ratio to achieve a better heat transfer performance under different operation temperatures. The filling ratio of 88% is found to be the optimum filling ratio for the prototype based on the performance indicator of the total heat transfer resistance. Under the optimum ratio condition, the heat transfer rate of the facade-built-in TPTL could reach up to about 132–300 W when heat source temperature maintains at 35–55 °C.