2010

Hybrid Heat Exchangers

A hybrid light-weight heat exchanger concept has been developed that uses high-conductivity carbon-carbon (C–C) composites as the heat-transfer fins and uses conventional high-temperature metals, such as Inconel, nickel, and titanium as the parting sheets to meet leakage and structural requirements.

In order to maximize thermal conductivity, the majority of carbon fiber is aligned in the fin direction resulting in 300 W/m.K or higher conductivity in the fin directions. As a result of this fiber orientation, the coefficient of thermal expansion (CTE) of the C–C composite in both non-fiber directions matches well with the CTE of various high-temperature metal alloys. This allows the joining of fins and parting sheets by using high-temperature braze alloys.

This work was done by Jianping Gene Tu and Wei Shih of Allcomp Inc. for Glenn Research Center. For more information, download the Technical Support Package (free white paper) at www.techbriefs.com/tsp under the Mechanics/ Machinery category.

Inquiries concerning rights for the commercial use of this invention should be addressed to NASA Glenn Research Center, Innovative Partnerships Office, Attn: Steve Fedor, Mail Stop 4–8, 21000 Brookpark Road, Cleveland, Ohio 44135. Refer to LEW-18454-1.

White Papers

HAIs and Chemical Resistance
Sponsored by Eastman
Developing Secure Embedded Software
Sponsored by PRQA
Basics of Electric Heaters
Sponsored by Hotwatt
Adhesion Reduction of Semiconductor Dicing Tape
Sponsored by Excelitas
A Brief History of Modern Digital Shaker Controllers
Sponsored by Crystal Instruments
Ultra Low Thermal Resistant Adhesives for Electronic Applications
Sponsored by Master Bond

White Papers Sponsored By:

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.