With the increasing mankind activities in the Arctic and the
potential threaten of global warming, permafrost protection has
attracted more and more attentions from all over the globe. As one
of the effective way, thermosyphons have been used to maintain
permafrost below structures for over half a century. Due to the
complex nature of internal processes and the environmental
interactions, complete system analyses are still lacking in the
literature. This work presents an analytical and numerical model of
a long inclined two-phase closed thermosyphon, known as a hairpin
thermosyphon, which is representative of a new configuration for
thermosyphons used in arctic applications. The thermosyphon has
been approved effective in protecting a recently built road project
near Fairbanks Alaska. A laboratory experiment and a full scale
road experiment along with associated modeling are described in
detail.
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