Ceramics heat exchanger and production method thereof

Abstract

In a heat exchange element 1, first fluid circulation portions 5 having a honeycomb structure having a plurality of cells separated by ceramic partition walls 4, extending through in an axial direction from one end face 2 to the other end face 2, and allowing a heated medium as a first fluid to flow therethrough and second fluid circulation portions 6 being separated by ceramic partition walls 4, extending in the direction perpendicular to the axial direction, allowing a second fluid to flow therethrough, transferring heat to a medium to be heated as the second fluid are alternately formed as a unit. The cells 3 on the first fluid circulation portion 5 side are smaller than the cells 3 on the second fluid circulation portion 6 side, and the partition walls have a density of 0.5 to 5 g/cm³ and a thermal conductivity of 10 to 300 W/mK.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a ceramics heat exchanger for transferring heat of the first fluid (high temperature side) to the second fluid (low temperature side).BACKGROUND OF THE INVENTION[0002]Generally, driving energy of an automobile is merely about 25% of fuel combustion energy. The rest becomes an energy loss such as a cooling loss (engine cooling water of 30%), an exhaust gas loss (exhaust gas of 30%), and the like. After 2010, in the automobile field, CO2 reduction has been becoming strict, and fuel efficiency requirements have been being tightened. Therefore, many automobile companies work on reduction of the exhaust gas loss, for example, exhaust heat recovery technology as a measure for reducing the energy loss to improve automobile gas mileage.[0003]Patent Document 1 discloses a ceramic heat exchange element where flow passages for a heated medium are disposed from one end face to the other end face of a ceramic main body and where flow p...

AI Technical Summary

Benefits of technology

[0023]In a ceramics heat exchanger of the present invention, attention is paid to heat and a heat exchange element which exchanges heat in exhaust heat recovery technology, and the heat exchanger realizes high heat exchange efficiency, miniaturization, weight saving, and cost reduction in comparison with a conventional heat exchange element (heat exchanger or its device).

Problems solved by technology

However, the structure does not have good efficiency regarding the heat exchange.

In addition, in the Patent Document 4, the structure is constituted of an evaporation portion (first heat exchange portion), a heat-transfer fin, and a condensation portion (second heat exchange portion) However, since it exchanges heat by means of a heat-transfer fin without directly exchanging heat, the heat exchange efficiency is low.

However, since exhaust gas flows through a gap between the flat plates, though the heat exchanger has high heat exchange efficiency in comparison with those of the Patent Documents 3 and 4, the contact area is not always large for heat transfer from the exhaust gas to the flat plates, and insufficient heat exchange may be caused between the exhaust gas and the cooling liquid.

Images