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A multi-fluid heat exchanger having separate fluid flow paths for two fluid streams to be heated or cooled by a third fluid stream includes first and second elongated, parallel tubular headers ( 10, 12), having opposed ends (14), generally uniformly spaced elongated tube slots (16) in each of the he

A multi-fluid heat exchanger having separate fluid flow paths for two fluid streams to be heated or cooled by a third fluid stream includes first and second elongated, parallel tubular headers ( 10, 12), having opposed ends (14), generally uniformly spaced elongated tube slots (16) in each of the headers (10, 12) with the tube slots (16) in one header (10) facing-and aligned with the tube slots (16) and the other header (12), a plurality of flattened tubes (20) extending between the headers (10, 12) and having ends (22) received in aligned ones of the tube slots (16), one tube slot (24) in each header being unoccupied by any of the flattened tubes (20), the one tube slots (24) being aligned with each other and located at a predetermined location between the ends (14) of the headers (10, 12) and between two groups (A, B) of the flattened tubes (20) so there are two groups of the flattened tubes (20) on each side of the one tube slot (24), a pair of baffles (30) in each header (10, 12) with one on each side of the one tube slot ( 24) and fins (26, 32) extend between and are in heat transfer relation with at least the adjacent tubes (20) in each of the groups (A, B).

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We claim: 1. A multi-fluid heat exchanger having separate flow paths for at least two fluid streams to be heated or cooled by a third fluid stream, comprising: first and second, elongated, spaced, parallel tubular headers having opposed ends; spaced elongated tube slots in each of said headers with

We claim: 1. A multi-fluid heat exchanger having separate flow paths for at least two fluid streams to be heated or cooled by a third fluid stream, comprising: first and second, elongated, spaced, parallel tubular headers having opposed ends; spaced elongated tube slots in each of said headers with the tube slots in one header facing and aligned with the tube slots in the other header; a plurality of flattened tubes extending between said headers and having ends received in aligned ones of said tube slots; one of said tube slots in each header being unoccupied, said one of said tube slots in each header being aligned with each other and located at a predetermined location between the ends of said headers and between two groups of said flattened tubes, a pair of baffles in each header, one on one side of said one tube slot and between said one tube slot and the adjacent tube slot on said one side and the other on the opposite side of said one tube slot and between said one tube slot and the adjacent tube slot on said opposite side; and fins extending between and in heat transfer relation with at least the adjacent tubes in each of said two groups. 2. The multi-fluid heat exchanger of claim 1 further including an additional fin in heat transfer relation with an end tube in each of said two groups, one of said end tubes being in said adjacent tube slots on said one side and the other of said end tubes being in said adjacent tube slots on said opposite side. 3. The multi-fluid heat exchanger of claim 2 wherein all said fins are serpentine fins and said additional fin has a fin height just greater than twice the fin height of the other fins. 4. The multi-fluid heat exchanger of claim 1 wherein the tube slots associated with one of said two groups are generally uniformly spaced as a group in each of said headers and the tube slots associated with the other of said two groups are generally uniformly spaced as a group in each of said headers. 5. A multi-fluid heat exchanger having separate flow paths for two fluid streams to be heated or cooled by a third fluid stream, comprising: first and second, elongated, spaced, parallel tubular header having opposed ends; spaced elongated tube slots in each of said headers with the tube slots in one header facing and aligned with the tube slots in the other header; a plurality of flattened-tubes extending between said headers and having ends received in aligned ones of said tube slots; a weep hole in each header, said weep holes in the headers aligned and facing each other and located at a predetermined location between the ends of said headers and between two groups of said flattened tubes; a pair of baffles in each header, one on one side of said weep hole and between said weep hole and an adjacent tube slot on said one side and the other on the opposite side of said weep hole and between said weep hole and an adjacent tube slot on said opposite side; first serpentine fins of a first fin height extending between and bonded to the adjacent tubes in each of said two groups; and a second serpentine fin of a second fin height greater than said first fin height extending between tubes in said adjacent tube slot on said one side and in said adjacent tube slot on said opposite side. 6. The multi-fluid heat exchanger of claim 5 wherein said second fin height is equal to about twice the first fin height plus the minor dimension of one of said tubes. 7. The multi-fluid heat exchanger of claim 5 wherein the tube slots associated with one of said two groups are generally uniformly spaced as a group in each of said headers and the tube slots associated with the other of said two groups are generally uniformly spaced as a group in each of said headers. 8. A multi-fluid heat exchanger having separate flow oaths for two fluid streams to be heated or cooled by a third fluid stream, comprising: first and second, elongated, spaced, parallel tubular header having opposed ends; spaced elongated tube slots in each of said headers with the tube slots in one header facing and aligned with the tube slots in the other header; a plurality of flattened tubes extending between said headers and having ends received in aligned ones of said tube slots; a weep hole in each header, said weep holes in the headers being aligned each other and located at a predetermined location between the ends of said headers and between two groups of said flattened tubes; a pair of baffles in each header, one on one side of said weep hole and between said weep hole and an adjacent tube slot on said one side and the other on the opposite side of said weep hole and between said weep hole and an adjacent tube slot on said opposite side; first serpentine fins of a first fin height extending between and bonded to the adjacent tubes in each of said two groups; a second serpentine fin of a second fin height greater than said first fin height extending between tubes in said adjacent tube slot on said one side and in said adjacent tube slot on said opposite side; and wherein said weep hole is provided in the form of one of said tube slots in each said header, said one tube slot being unoccupied by any of said flattened tubes.