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All-Metal, Compact Heat Exchanger for Space Cryocoolers

All-Metal, Compact Heat Exchanger for Space Cryocoolers

          
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About the Book

This 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. Swift, Walter L. and Valenzuela, Javier and Sixsmith, Herbert Unspecified Center NAS5-30172; PROJ. 3307; SBIR-09.07-3800...


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Product Details
  • ISBN-13: 9781729162637
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 42
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1729162630
  • Publisher Date: 24 Oct 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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