Patent ID: 8240365

Claim:
A gas turbine engine heat exchanger comprising: a lattice formed from a plurality of tubes, the tubes in the lattice are divided into at least two tube groups, the tubes in at least one tube group are arranged at a crossing angle to the tubes in at least one other tube group and the tube groups are stacked in a stack layer with junctions being defined where a respective tube in at least one tube group crosses a respective tube in at least one other tube group, the lattice having interconnecting interstices between the tubes located at ends of the tube groups to enable heat exchange between a fluid or fluids inside the tubes and another fluid outside the tubes and the junctions being located between the ends of the tube groups, the exchanger being constructed so that the fluid flowing through the tubes is from a gas turbine engine during use, wherein at least some of the junctions provide fluid interconnection between the tube groups.