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A heat pipe heat exchanger generally adopts a gravity heat-pipe configuration. When the hot end (evaporator section) of the gravity heat pipe absorbs heat from the hot airflow passing through it, the high-saturation vapor generated by the volatile liquid inside the pipe flows toward the cold end (condenser section). The cold airflow absorbs the heat released by the vapor and causes it to condense; the resulting condensate then returns to the evaporator section by gravity. This completes the evaporation-to-condensation cycle and, with it, the entire heat exchange process.