Heat recovery device and heat recovery system

A heat recovery device, comprising:

• a honeycomb structure comprising an outer peripheral wall having at least one planar outer peripheral surface, and partition walls arranged on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells each extending from a first end face to a second end face to form a flow path for a first fluid;
• a thermoelectric conversion element arranged to face the planar outer peripheral surface of the outer peripheral wall;
• a cylindrical member that circumferentially covers the honeycomb structure in which the thermoelectric conversion element is arranged;
• a casing arranged at an interval so as to form a flow path for a second fluid, the casing being arrange on a radially outer side of the cylindrical member;
• a pressing member being configured to press the cylindrical member against the thermoelectric conversion element;
• and
• a buffer member arranged between the cylindrical member and the thermoelectric conversion element, the buffer member being in contact with an inner surface of the cylindrical member;
• wherein the buffer member is made of a material selected from graphite, silicone resins, and acrylic resins.