Development of a 77K Reverse-Brayton Cryocooler with Multiple Coldheads, Phase I

Metadata Updated: November 12, 2020

RTI will design and optimize an 80 W, 77K cryocooler based on the reverse turbo Brayton cycle (RTBC) with four identical coldheads for distributed cooling. Based on preliminary analysis, the single centrifugal compressor with integrated motor will be 10 cm in diameter and 15 cm in length, and rotate at about 100,000 rpm. Each coldhead (consisting of a recuperative heat exchanger, turbo-expander and cold side heat exchanger) is expected to be about 6X6X15 cm in linear dimensions, and weighs about 0.2 kg. Key technical innovations are superior aerodynamics for a compact, reliable and efficient compressor, distributed RTBC cryocooling with a single compressor, and techniques to drastically minimize performance-degrading axial conduction in recuperative heat exchangers. Microfabrication is a key enabler for implementation of this concept. Phase I will involve system design, and design and fabrication of the compressor. The Phase II goal is to integrate the compressor with motor, electronics and gas foil bearings with a target isentropic efficiency of 80% at a pressure ratio of 1.75. It is expected that the coefficient of performance of the overall RTBC system when completed would be at least 0.12, with the minimum and maximum cycle temperature being 64 K and 440 K respectively.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020

Metadata Source

Harvested from NASA Data.json

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Resource Type Dataset
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Publisher Space Technology Mission Directorate
Unique Identifier Unknown
Identifier TECHPORT_5275
Data First Published 2004-07-01
Data Last Modified 2020-01-29
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Homepage URL
Program Code 026:027
Source Datajson Identifier True
Source Hash dbd874d8db27b902ddd45cd445f4617d35dcb187
Source Schema Version 1.1

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