Heat transfer device with nested layers of helical fluid channels

A method of transferring heat between fluids using a heat transfer device including a set of nested tubular walls intersected by a plurality of helical walls to form one or more first channel layers nested with one or more second channel layers, the method comprising:

• passing a first fluid through the heat transfer device between a first intake and a first outtake via a plurality of helical fluid channels of each of the one or more first channel layers of the heat transfer device;
• and
• passing a second fluid through the heat transfer device between a second intake and a second outtake via a plurality of helical fluid channels of each of the one or more second channel layers of the heat transfer device;
• wherein each first channel layer is located between an adjacent pair of the tubular walls, and wherein each second channel layer is located between an adjacent pair of the tubular walls.

A vehicle comprising:

• a vehicle body;
• an engine connected to the vehicle body and configured to power the vehicle body;
• and
• a counterflow heat transfer device connected to the vehicle body and/or the engine and including:
• a first helical flow path and a second helical flow path, each including a plurality of helical fluid channels,
• wherein the helical fluid channels of both flow paths are formed by a plurality of helical walls intersecting a set of nested tubular walls, each of the plurality of helical walls extending radially outward, linearly, in a plane including a central axis of the device, and
• wherein each helical wall of at least a subset of the plurality of helical walls projects into a lumen of an innermost nested tubular wall of the set of nested tubular walls.