b) Intermediate temperature thermosyphons
There are many applications for thermosyphons in the 250-400°C operating range, though one of the
main issues is the type of working fluids used in this temperature range. Organic fluids have great
potential due to their appropriate operational properties, though they may decompose or dissociate,
generating non-condensable gases and therefore compromising the thermosyphon efficiency. Research on
such fluids involves the study of non-condensable gas formation inside the thermosyphon, and the
compatibility between the tube material and the working fluid in operation.
The main application of intermediate temperature fluids is in
heat exchangers.
Figure 1 - Glass thermosyphon with Naphthalene as working fluid
Figure 2 - Thermographic image of a glass thermosyphon with Naphthalene fluid
Publications
MANTELLI, M. B. H.; KNIESS, C. T.; MARTINS, G. J. M.; NUERNBERG, G. G. V.; NUERNBERG, C. Estudo da Viabilidade do Uso de Naftaleno como Fluido de Trabalho em Termossifões. In: 11th Brazilian Congress of Thermal Sciences and Engineering - ENCIT 2006, 2006, Curitiba. Proceedings of the 11th Brazilian Congress of Thermal Sciences and Engineering - ENCIT 2006.
KNIESS, C. T.; MANTELLI, M. B. H.; MARTINS, G. J. M.; NUERNBERG, G. G. V.; ANGELO, W. B.; SILVA, C. N.; COELHO, C. E. Estudo Experimental do Uso de Naftaleno como Fluido de Trabalho em Termossifões Bifásicos. In: Seminário Petrobras de Rede Gás e Energia, 2006, Rio de Janeiro.
KNIESS, C. T.; MANTELLI, M. B. H.; CUNHA, A. F.; NUERNBERG, G. G. V.; ÂNGELO, W. B.; COELHO, C. E. Experimental Study of Mercury and Naphthalene Thermosyphons. In: 14th International Heat Pipe Conference (14th IHPC), 2007, Florianópolis. Proceedings 14th International Heat Pipe Conference, 2007. p. 45-50.
