AN ALL-METAL COMPACT HEAT EXCHANGER FOR SPACEBORNE CRYOCOOLERS

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$218,000.00
Award Year:
1987
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
2775
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Creare Inc.
Po Box 71, Hanover, NH, 03755
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Herbert Sixsmith
Principal Investigator
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
THE OVERALL CYCLE EFFICIENCY (HENCE, INPUT POWER REQUIREMENTS) OF REVERSE-BRAYTON CRYOCOOLERS FOR SPACE APPLICATIONS IS HIGHLY SENSITIVE TO THE THERMAL EFFECTIVENESS OF THE HEAT EXCHANGERS. APPLICATIONS FOR THESE CRYOCOOLERS IN SPACE DICTATE THAT THESE HEAT EXCHANGERS BE AS SMALL AND LIGHT AS POSSIBLE. TO DATE, ONLYHEAT EXCHANGERS EMPLOYING ORGANIC MATERIALS HAVE BEEN ABLE TO ACHIEVE THE HIGH THERMAL EFFECTIVENESS VALUES REQUIRED FOR THESE SYSTEMS WITHIN THE ALLOWED SIZE AND WEIGHT LIMITATIONS. HOWEVER, HEAT EXCHANGERS WITH ORGANIC MATERIALS DEGRADE CYCLE PERFORMANCE BY LEAKAGE AND SYSTEM CONTAMINATION. THEREFORE, A COMPACT ALL-METAL HEAT EXCHANGER WITH HIGH THERMAL EFFECTIVENESS IS HIGHLY DESIRABLE. THIS PROPOSAL DESCRIBES A PROGRAM TO DEVELOP A HIGH PERFORMANCE, ALL METAL HEAT EXCHANGER. TWO HEAT EXCHANGER CONCEPTS WILL BE EVALUATED WITH RESPECT TO SIZE AND WEIGHT WITH THE AIM OF ACHIEVING A THERMAL EFFECTIVENESS IN EXCESS OF 0.98 WITH MINIMAL PRESSURE DROP. PHASE I WILL EXTEND EXISTING THEORETICAL MODELS AND OPTIMIZE THE EXCHANGER GEOMETRY WITH CONSIDERATION TO EFFECTIVENESS, PRESSURE DROP,WEIGHT, AND SIZE. FABRICATION AND ASSEMBLY TECHNIQUES OF KEY EXCHANGER ELEMENTS WILL ALSO BE DEMONSTRATED DURING PHASE I.

* information listed above is at the time of submission.

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