USA flag logo/image

An Official Website of the United States Government

Feasibility Demonstration of a Multi-Cylinder Stirling Convertor with a Duplex…

Award Information

National Aeronautics and Space Administration
Award ID:
Program Year/Program:
2004 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
1840 Terminal Drive  Richland , WA -
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2004
Title: Feasibility Demonstration of a Multi-Cylinder Stirling Convertor with a Duplex Linear Alternator
Agency: NASA
Contract: NNC04CA67C
Award Amount: $70,000.00


Stirling Technology Company (STC) proposes to integrate an existing Multi-Cylinder Free-Piston Stirling Engine (MPFPSE) with innovative compact linear alternators. Future manned and unmanned scientific and exploration missions will require substantially more electric power from nuclear, solar, and other heat sources than existing launch-capable systems can effectively provide. A scalable, cost-effective, safe, reliable, low mass, robust, high-efficiency, heat-to-electric power convertor is proposed. Innovative aspects include: 1) increased power density through the use of a double-acting MCFPSE, 2) increased system efficiency by improving phase angle and reducing alternator losses, and 3) an innovative duplex linear alternator design with the potential to improve efficiency and reduce mass. This advanced dynamic power system for heat-to-electric power conversion is based on a free-piston implementation of the well-known Siemens four-cylinder heat exchanger interconnection arrangement combined with highly reliable, flexure-supported linear alternators. These proven technologies provide high power density, while retaining the simplicity and long-life inherent with flexure-supported hardware, as evidenced by an on-going 79,000-hour (9-year) maintenance-free, degradation-free endurance test at STC. Power convertors based on this innovative arrangement are scalable up to tens of kilowatts, while modular combinations of coaxially-aligned, opposed power convertors will produce very low net vibration forces.

Principal Investigator:

Songgang Qiu
Principal Investigator

Business Contact:

Tom D. Mitchell
Business Official
Small Business Information at Submission:

Stirling Technology Company
4208 West Clearwater Ave. Kennewick, WA 99336

EIN/Tax ID: 911319589
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No