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AN ALL-METAL COMPACT HEAT EXCHANGER FOR SPACEBORNE CRYOCOOLERS

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 2775
Amount: $218,000.00
Phase: Phase II
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1987
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
Po Box 71
Hanover, NH 03755
United States
DUNS: 072021041
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Dr Herbert Sixsmith
 Principal Investigator
 () -
Business Contact
Phone: () -
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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