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All-metal, compact heat exchanger for space cryocoolersThis report describes the development of a high performance, all metal compact heat exchanger. The device is designed for use in a reverse Brayton cryogenic cooler which provides five watts of refrigeration at 70 K. The heat exchanger consists of a stainless steel tube concentrically assembled within a second stainless steel tube. Approximately 300 pairs of slotted copper disks and matching annular slotted copper plates are positioned along the centerline axis of the concentric tubes. Each of the disks and plates has approximately 1200 precise slots machined by means of a special electric discharge process. Positioning of the disk and plate pairs is accomplished by means of dimples in the surface of the tubes. Mechanical and thermal connections between the tubes and plate/disk pairs are made by solder joints. The heat exchanger assembly is 9 cm in diameter by 50 cm in length and has a mass of 10 kg. The predicted thermal effectiveness is greater than 0.985 at design conditions. Pressure loss at design conditions is less than 5 kPa in both fluid passages. Tests were performed on a subassembly of plates integrally soldered to two end headers. The measured thermal effectiveness of the test article exceeded predicted levels. Pressure losses were negligibly higher than predictions.
Document ID
19930004416
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Swift, Walter L. (Creare, Inc. Hanover, NH, United States)
Valenzuela, Javier (Creare, Inc. Hanover, NH, United States)
Sixsmith, Herbert (Creare, Inc. Hanover, NH, United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1990
Subject Category
Engineering (General)
Report/Patent Number
NASA-CR-190861
NAS 1.26:190861
TM-1450
Accession Number
93N13604
Funding Number(s)
PROJECT: SBIR-09.07-3800
CONTRACT_GRANT: NAS5-30172
PROJECT: PROJ. 3307
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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