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

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNJ04JC26C
Agency Tracking Number: 035620
Amount: $69,758.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solicitation Year: 2003
Solicitation Topic Code: F3.06
Solicitation Number: N/A
Small Business Information
Rini Technologies Inc
3267 Progress Drive, Orlando, FL, 32826-3230
DUNS: 062473041
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Daniel Rini
 Principal Investigator
 (407) 384-7840
 dan@rinitech.com
Business Contact
 Daniel Rini
Title: Business Official
Phone: (407) 384-7840
Email: dan@rinitech.com
Research Institution
N/A
Abstract
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.

* information listed above is at the time of submission.

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