Patent ID: 8347503

Claim:
A method of constructing a heat exchanger, comprising: providing a first heat exchanger core subassembly including a first joinable end, at least one cooling passage, at least one boiling passage, and a first partial finless passage arranged at the first joinable end; providing a second heat exchanger core subassembly including a second joinable end, at least one cooling passage, at least one boiling passage, and a second partial finless passage arranged at the second joinable end; subjecting the first heat exchanger core subassembly and the second heat exchanger core subassembly to a temperature and for a time sufficient to braze the first and second heat exchanger core subassemblies to form a brazed first heat exchanger core subassembly and a brazed second heat exchanger core subassembly; and affixing the first joinable end of the brazed first heat exchanger core subassembly to the second joinable end of the brazed second heat exchanger core subassembly and the first partial finless passage to the second partial finless passage to form a coupled finless passage, and thereby form a heat exchanger core wherein the first and second partial finless passages include an enhanced boiling layer disposed thereon.