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A heat exchanger plate cooperable with a plate of like configuration to form a pair of manifolds and a connecting passage with the plate also cooperable with another plate of another pair of like configuration so as to nest therewith to provide an adjoining double wall between separate passages form

A heat exchanger plate cooperable with a plate of like configuration to form a pair of manifolds and a connecting passage with the plate also cooperable with another plate of another pair of like configuration so as to nest therewith to provide an adjoining double wall between separate passages formed by adjacent arranged pairs of plates.

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A plate of uniform thickness arrangeable with plates of like kind to form a heat exchanger having passages for two fluids separated by an adjoining pair of walls, said plate comprising a planar portion, a series of protuberant channel portions protruding in the same direction from said planar portio

A plate of uniform thickness arrangeable with plates of like kind to form a heat exchanger having passages for two fluids separated by an adjoining pair of walls, said plate comprising a planar portion, a series of protuberant channel portions protruding in the same direction from said planar portion, said series including at least two parallel rows extending across the plate, said series divided into three groups extending across said rows comprising first and second groups at opposite end portions of the rows and a third group intermediate said first and second groups, the channel portions in said first and second groups oriented at opposite oblique angles to said rows, and the channel portions in said third group having sides oriented at opposite oblique angles to said rows and having less protuberance than the channel portions in said first and second groups whereby a pair of the plates are arrangeable with their dimple sides facing each other so that their planar portions sealingly abut and the channel portions in their first group cross to interconnect and also the channel portions in their second group cross to interconnect while the channel portions in their third group register to connect the first and second groups to thereby form a sealed fluid passage between the plates and whereby a plurality of pairs of the sealingly abutting plates are also arrangeable in adjoining relationship with their protuberant sides facing each other so that two pairs of sealingly abutting plates have the channel portions in their third group abutting while the channel portions in their first and second groups nest along side each other and abut the opposite planar portion to thereby provide substantial surface-to-surface contact between the pairs of sealingly abutting plates and to form therewith separate fluid passages for two fluids which are separated by two of the plates.