Project Title:

An All-Metal Compact Heat Exchanger For Spaceborne Cryocooler

09.07-3800
An All-Metal Compact Heat Exchanger For Spaceborne Cryocooler
Creare Inc.
P.O. Box 71
Hanover
NH
03755
Sixsmith
Herbert
603-643-3800
50219
29277
49,300
GSFC

Abstract:

The overall cycle efficiency (hence, input power requirements) of reverse-Brayton
cryocoolers for space applications is highly sensitive to the thermal effectiveness
of the heat exchangers. Applications for these cryocoolers in space dictate that
these heat exchangers be as small and light as possible.  To date, only heat exchangers
employing organic materials have been able to achieve the high thermal effectiveness
values required for these systems within the allowed size and weight limitations.
 However, heat exchangers with organic materials degrade cycle performance by leakage
and system contamination.  Therefore, a compact all-metal heat exchanger with high
thermal effectiveness is highly desirable.

	A high performance, all metal heat exchanger has been developed, based on evaluation
of two heat exchanger concepts, with respect to size and weight with, the aim of
achieving a thermal effectiveness in excess of 0.98 with minimal pressure drop. 
Fabrication and assembly techniques of key exchanger elements has also been developed.