Patent ID: 6092590
Filing Date: 2000-07-25
Classification: B64G,F02C,F17C,F28D,Y02E,Y02P

Abstract:
An evaporator apparatus for evaporating a first medium that is initially in liquid form, through heat transfer from a second medium, comprising:a hot medium passage adapted to have the second medium flow therethrough, anda channel adapted to have the first medium flow therethrough and be evaporated therein; wherein:said channel is arranged outwardly around said hot medium passage;said channel includes a first forward-flowing channel portion adapted to have the first medium flow therein in a first net direction, and a second return-flowing channel portion connected in series flow communication at a downstream end of said first channel portion and adapted to have the first medium flow therein in a second net direction substantially opposite said first net direction;at least a part of said second channel portion is arranged between the entirety of said hot medium passage and the entirety of said first channel portion;said hot medium passage, said first channel portion and said second channel portion are so arranged relative to each other so that said hot medium passage and said second channel portion share a common boundary wall therebetween, and so that said hot medium passage and said first channel portion do not share a common boundary wall anywhere in said evaporator apparatus; andsaid first channel portion comprises a first helical flow channel, said second channel portion comprises a second helical flow channel, and said first and second helical flow channels respectively have helical rotations in opposite rotation directions.