Patent ID: 8056616

Claim:
An exhaust heat recovery apparatus comprising: an evaporation unit disposed in a first fluid passage through which a first fluid flows, the evaporation unit including a tube for defining a passage through which an operation fluid flows, for performing heat exchange between the first fluid and the operation fluid, thereby evaporating the operation fluid; a condensation unit in communication with the evaporation unit such that the operation fluid circulates in the evaporation unit and the condensation unit, the condensation unit disposed in a second fluid passage through which a second fluid flows, for performing heat exchange between the second fluid and the operation fluid, thereby condensing the operation fluid; and a wet area increasing member for increasing a wet area of the operation fluid due to surface tension of the operation fluid, wherein the wet area increasing member for increasing a wet area of the operation fluid due to surface tension of the operation fluid, wherein the wet area increasing member is disposed in the tube at a position adjacent to an inner surface of the tube, and has a plurality of extension surfaces, each of which extending in a direction intersecting with the inner surface of the tube, ends of the extension surfaces of the wet area increasing member being spaced from the inner surface of the tube.