Compact and Efficient Cooling Techniques for High Energy Solid State Lasers

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: W31P4Q-05-C-R189
Agency Tracking Number: 04SB1-0575
Amount: $749,210.00
Phase: Phase II
Program: SBIR
Awards Year: 2005
Solicitation Year: 2004
Solicitation Topic Code: SB041-032
Solicitation Number: 2004.1
Small Business Information
RINI TECHNOLOGIES INC
3267 Progress Drive, Orlando, FL, 32826
DUNS: 608777798
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Daniel Rini
 President
 (407) 384-7840
 dan@rinitech.com
Business Contact
 Daniel Rini
Title: President
Phone: (407) 384-7840
Email: dan@rinitech.com
Research Institution
N/A
Abstract
In Phase I of this effort RTI performed ammonia evaporative spray cooling (ESC) experiments on both 2 cm^2 and 21 cm^2 surfaces to establish feasibility and scalability of ESC to cool 500 W/cm^2 while maintaining temperature uniformity within +/-2.5C over the entire surface area. RTI's two-phase ESC approach achieved this performance with 10x less coolant flow rate than traditional single-phase water micro-channel (MC) coolers. These experimental results were used to complete a design trade study for a 100 kWo solid-state laser (SSL) cooling system intended for deployment on compact tactical platforms. In Phase II of this effort RTI proposes to build a 25 kW breadboard cooling system that validates the cooling system architecture identified in Phase I, providing cooling for two 21 cm^2 large area diode array coolers, as well as cooling for a secondary heat source representative of gain material heat generation. As part of the Phase II effort, RTI will also design, build and test customized liquid pump and vapor compressor prototype units that are ammonia compatible, efficient, compact and lightweight. The overall goal of the Phase II effort is to validate the ESC design by combining all the critical ESC components into a breadboard system showing system-level viability and providing a pathway for the further advancement of ESC technology as a thermal management approach for HELs deployed on tactical platforms.

* information listed above is at the time of submission.

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