Patent ID: 7025119
Filing Date: 2006-04-11
Classification: F28D,F28F

Abstract:
1. A heat exchanger comprising a first spiral passage; a second spiral passage formed along said first passage, which is adjacent to said first passage via walls; first and second end plates which cover both end faces of said first and second passages, respectively; a first inlet of first passage, consisting essentially of a group of openings formed in a first region located at about an outer half or about an inner half of an area continuous along radial direction in said first end plate, which openings are open only to said first passage; a first outlet of first passage, consisting essentially of a group of openings formed in a second region located at about an outer half of an area continuous along radial direction in said first or second end plate when said first inlet of first passage is located at said about outer half of said radially continuous area, or located at about an inner half of an area continuous along radial direction in said first or second end plate when said first inlet of first passage is located at said about inner half of said radially continuous area, which openings are open only to said first passage; a second inlet of first passage, consisting essentially of a group of openings formed in a third region located at about an outer half of an area continuous along radial direction in said first or second end plate when said first inlet of first passage is located at said about inner half of said radially continuous area, or located at about an inner half of an area continuous along radial direction in said first or second end plate when said first inlet of first passage is located at said about outer half of said radially continuous area, which openings are open only to said first passage; a second outlet of first passage, consisting essentially of a group of openings formed in a fourth region located at about an outer half of an area continuous along radial direction in said first or second end plate when said second inlet of first passage is located at said about outer half of said radially continuous area, or located at about an inner half of an area continuous along radial direction in said first or second end plate when said second inlet of first passage is located at said about inner half of said radially continuous area, which openings are open only to said first passage; a second passage inlet consisting essentially of a group of openings formed in a fifth region continuous along radial direction in said first or second end plate, which fifth region is formed in an area other than said first to fourth regions, which openings are open only to said second passage; a second passage outlet consisting essentially of a group of openings formed in a sixth region continuous along radial direction in said first or second end plate, which sixth region is formed in an area other than said first to fourth regions, and is formed in the first or second end plate other than the one in which said second passage inlet is formed, which openings are open only to said second passage; and a third passage which air-tightly connect said first outlet of first passage and said second inlet of first passage; said first passage being tightly closed except for said first and second inlets of first passage and said first and second outlets of first passage; said second passage being tightly closed except for said second passage inlet and said second passage outlet; a first fluid entering said first passage from said first inlet of first passage entering said third passage from said first outlet of first passage after passing through said first passage less than one turn only, then entering said first passage from said second inlet of first passage, and being discharged from said second outlet of first passage after passing through said first passage less than one turn only; a second fluid entering said second passage from said second inlet being discharged from said second passage outlet after passing through said second passage in axial direction; heat being exchanged between said first and second fluids through said wall during said first and second fluids pass through said first and second passages, respectively.