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[en] There have been many tries to predict heat transfer capability and working limitation of thermosyphon, therefore, there are serval correlations equation show a good agreement with experimental data. However, it is very rare about reports of thermal performance of thermosyphon with relatively long length, which can be applied passive cooling system for nuclear plant. For proper design passive cooling system with thermosyphon for nuclear plant, it is essential that predict thermal performance of relatively long thermosyphon. In this study, we did experiment to figure it out length effect on thermal performance of thermosyphon. In this paper, we showed length effect on thermal performance of thermosyphon with different length. Through present study, we can know following points. 1) There is length effect on count current flooding limitation in thermosyphon, therefore, it should be considered when relatively long thermosyphons would be designed. e.g.) Passive cooling system for nuclear spent fuel pool. 2) Excepting Hashimoto model, which shows 30% error with present experiment results, the other models shows very big difference with current experiment data. So, it should be carefully to predict and design condensation heat transfer when length of thermosyphon is relatively long. 3) The reason, which can effect on big deviance between models and present data for condensation heat transfer, can be consider as different extent of developed film and it can have effect on pressure gradient of consider part, which may influence on condensation heat transfer.