초록 ▼

A high temperature fluid-to-fluid heat exchanger is described wherein heat is transferred from a higher temperature fluid flow core region to a lower temperature fluid flow annulus. The wall separating the high and low temperature fluid flow regions is comprised of a material having high thermal abs

A high temperature fluid-to-fluid heat exchanger is described wherein heat is transferred from a higher temperature fluid flow core region to a lower temperature fluid flow annulus. The wall separating the high and low temperature fluid flow regions is comprised of a material having high thermal absorptivity, conductivity and emissivity to provide a high rate of heat transfer between the two regions. A porous ceramic foam material occupies a substantial portion of the annular lower temperature fluid flow region, and is positioned to receive radiated heat from the wall. The porosity of the ceramic foam material is sufficient to permit a predetermined relatively unrestricted flow rate of fluid through the lower temperature fluid flow region.

대표청구항 ▼

A high temperature fluid-to-fluid heat exchanger for transferring heat from a higher temperature fluid flow region to a lower temperature fluid flow region, comprising: wall means separating said higher temperature fluid flow region from said lower temperature fluid flow region, said wall means havi

A high temperature fluid-to-fluid heat exchanger for transferring heat from a higher temperature fluid flow region to a lower temperature fluid flow region, comprising: wall means separating said higher temperature fluid flow region from said lower temperature fluid flow region, said wall means having thermal conductivity and substantial thermal emissivity on the side thereof facing said lower temperature fluid flow region; porous ceramic foam material occupying a substantial portion of said lower temperature fluid flow region, said ceramic foam material being positioned proximate said wall means to absorb a substantial amount of radiated heat therefrom, wherein said ceramic foam does not contact said wall means, such that a narrow gap is formed between said wall means and said foam material said ceramic foam material having a porosity sufficient to permit a predetermined flow rate of fluid along the edge thereof; and, fluid inlet means and fluid outlet means positioned proximate opposite ends of said wall means such that a fluid to be heated flows within said lower temperature fluid flow region along the wall means, said fluid flow being primarily in any gap between said wall means and said ceramic foam material, and in the portion of said ceramic foam material nearest said wall means, such that the net fluid flow through said foam material is predominantly in a direction parallel to said wall means.