Heat exchanger, method of evaporating liquid and distillation device

摘要

Element for heat exchanging between fluids, where the flowing canals for the fluids are formed of slits on either side of a thin, folded sheet material ( 1 ), and that the ratio between the slit width ( 24 ) of the canals and depths ( 25 ) in the slits is less than 0.15 times the thickness of the sheet material.