An evaporative heat exchanger (10) is provided for the transfer of heat to afirst fluid (30) from a second fluid (28) and a third fluid (22) to vaporizethe first fluid (30). The heat exchanger (10) includes a core (40), a firstflow path (60) in the core for the first fluid (30), a second flow path (66)in the core (40) for the second fluid (28), and a third flow path (68) in thecore (40) for the third fluid (22). The core (40) includes a first section(42), a second section (44), and a third section (46), with the second section(44) connecting the first and third sections (42, 46). The first flow path(60)extends through all of the sections (42, 44, 46), the second flow path (66)extends through the first section (42); and the third flow path (68) extendsthrough the third section (46).
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