Heat exchanger for stirling machine and method for manufacturing heat exchanger

A heat exchanger for a Stirling machine, the Stirling machine including an expansion chamber and a compression chamber, the heat exchanger comprising:

• a heater;
• a regenerator;
• and
• a cooler, wherein
• the heater, the regenerator, and the cooler are connected in series in a flow direction of a working fluid, and communicate the expansion chamber with the compression chamber,
• the heater includes
• a first flow channel communicating with the expansion chamber and the regenerator and configured to allow the working fluid to flow therethrough,
• a second flow channel configured to allow a first fluid for exchanging heat with the working fluid to flow therethrough, and
• a partition wall defining and forming the first flow channel and the second flow channel,
• a heat transfer coefficient in a flow in which the first fluid flows through the second flow channel is smaller than a heat transfer coefficient in a flow in which the working fluid flows through the first flow channel,
• the second flow channel is provided with a spiral flow generation portion configured to generate a spiral flow along a direction in which the second flow channel extends, and
• the first flow channel is not provided with the spiral flow generation portion.