Patent ID: 6991025
Filing Date: 2006-01-31
Classification: F28D,F28F

Abstract:
1. A multipass plate pair for conducting a fluid in a heat exchanger, comprising: first and second plates, each plate having at least two longitudinal columns of externally protruding obliquely angled ribs formed therein and separated by a longitudinal flat section extending from substantially a first end of the plate to a terminus spaced apart from a second end of the plate, each plate including, between the terminus and the second end, a turn portion joining the two longitudinal columns, the first and second plates joined together about peripheral edge sections thereof with the longitudinal flat sections abutting each other and the columns of angled ribs cooperating to form undulating first and second internal flow channels separated by the abutting longitudinal flat sections, the first and second internal flow channels each having an upstream area and a downstream area relative to a flow direction of an external fluid flowing over the plate pair, the turn portions of the plates cooperating to define at least a first internal flow path for directing fluid from the upstream area of the first internal flow channel to the downstream area of the second internal flow channel and a second internal flow path for directing fluid from the downstream area of the first internal flow channel to the upstream area of the second internal flow channel, the turn portion of each plate including a first outwardly protruding rib and a second outwardly protruding rib that each have central portions that are separated from each other by a flat dividing section and located between the terminus and the second end, the first ribs of the joined plates cooperating to provide the first internal flow path and the second ribs of the joined plates cooperating to provide the second internal flow path.