Bronze level automatically awarded US beta

This data has achieved Bronze level on 23 October 2015 which means this data makes a great start at the basics of publishing open data.

High Effectiveness Heat Exchanger for Cryogenic Refrigerators Project

Summary

Type of release
a one-off release of a single dataset

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Release Date
9 April 2015
Modified Date
8 July 2015
Publishers
National Aeronautics and Space Administration
Keywords
completed, jet-propulsion-laboratory, project
Identifier
high-effectiveness-heat-exchanger-for-cryogenic-refrigerators-project
Landing Page
http://techport.nasa.gov/view/5125
Maintainers
Jack Fryer jayfryer@microcoolingconcepts.com
Language
en-US

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Description

We propose an innovative high performance cryogenic heat exchanger manufactured of titanium by photo-etching and diffusion bonding. This is a parallel plate design of thin laminated titanium foils. Titanium is used because of it low thermal conductivity which allows more compact heat exchangers with lower parasitic heat loss. Photo-etched patterns in the foils create the flow passages for the hot and cold flows with solid barrier foils separating the streams. A difficult problem with high performance heat exchangers is balancing the mass flow rate between multiple flow passages required for all but the smallest levels of cooling; this problem can degrade exchanger ineffectiveness by factors of more then 3. Our manufacturing technique allows us to include flow balancing features within the flow passages to automatically balance the flow rates. Recuperative cycle cryocoolers, such as reverse Brayton, Joule-Thomson or their hybrids, require high effectiveness heat exchangers to reach cryogenic temperatures. Higher effectiveness leads directly to improved system efficiency or allows lower temperatures to be reached. Improved heat exchanger performance will directly lead to lower input power cryocoolers particularly for the 4-10 K temperature range where cryocooler system efficiencies are very low.

Información General

Información legal

This dataset has been created by US Government which means it is required to be in the public domain. However US copyright law only allows open access by US citizens, we have assumed the data is equivalently licensed as CC0 for the rest of the world as this is in the spirit of the US Government’s Open Data policy.

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