Abstract
The thermosyphon can operate without an external power supply, and has simple structure. Therefore, thermosyphon can reduce energy consumption and CO_2 emissions. Ito et al. developed a device in which the reservoir and the condenser are separated. Using this device, it was possible to drastically reduce the time ofonset circulation. The solar input energy varies time to time. Therefore, the start-up condition of the system and the transient behavior against varying heat input are important sut!jects and those were studied in this paper. The main results are as following. First, thermosyphon showed good response to the stepwise variation with 200W amplitude. Second, thermosyphon can be driven by the heat input as low as 40 W.
