Hi-Z Technology, Inc.

Technical Papers from 2005

Quantum Well Thermoelectric Devices

S. Ghamaty and N. B. Elsner

Abstract
Fabrication development of high efficiency quantum well (QW) thermoelectric continues with the P-type B4C/B9C and N-type Si/SiGe films. Si/SiC is being developed to replace Si/SiGe for higher temperature operation. Both isothermal and gradient life testing are underway. One couple has achieved 700 hours at Th of 300°C and Tc of 50°C with no degradation. Emphasis is now shifting towards couple and module design and fabrication. Preliminary design calculations regarding the development of actual quantum well modules will be presented for both power prediction and cooling applications. These modules can be used in future energy conversion system as well as air conditioning system designs.

Full-text article available for download. (PDF)

A Self-Powered Field Feeding System

Don Pickard, Frank DiLeo, Aleksandr Kushch, Markvard Hauerbach and Lawrence LeVine

Abstract
Thermoelectric technology has been used to reduce the logistics of field feeding. A conventional Tray Ration Heater (TRH) powered by the HMMWV, was redesigned to include a thermoelectric generator, a low power consumption DC burner, and a newly designed Power Management System (POMS). Two STRHs were fabricated and tested, and demonstrated the capability of heating rations for field feeding independent of external power generation equipment. In addition, the STRH produces surplus electricity that can be used for various needs, such as lighting, battery charging, powering radios, communication devices, etc. Most importantly, the independent operation of the STRH provides the operational flexibility to drop the field feeding system should there be a requirement for the HMMWV to accomplish another mission. Compared to powering the TRH with a 2 kW diesel generator, the integral thermoelectric generator reduces the field feeding system weight, cost, and fuel consumption, while significantly increasing system reliability.

Full-text article available for download. (PDF)