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Título del libro: Asme 2011 Conference On Smart Materials, Adaptive Structures And Intelligent Systems, Smasis 2011
Título del capítulo: Development of a shape memory alloy heat engine through experiment and modeling

Autores UNAM:
GUILLERMO MANUEL HERRERA PEREZ;

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Autores externos:

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Idioma:

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Año de publicación:
2011

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Palabras clave:

Costs; Energy policy; Heat engines; Heat exchangers; Intelligent materials; Intelligent systems; Temperature; Titanium alloys; Waste heat; Waste heat utilization; Design complexity; Low-temperature waste heats; Material development; NiTi shape memory alloys; Power transducers; Steady-state power; Thermal energy recoveries; University of Michigan; Shape-memory alloy

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Resumen:

Few technologies can produce meaningful power from low temperature waste heat sources below 250°C, particularly on a per-mass basis. Since the 1970's energy crisis, NiTi shape memory alloy (SMA) and associated thermal engines have been considered a viable heat-to-power transducer but were not adopted due to previously poor material quality, low supply, design complexity, and cost. Decades of subsequent material development, research, and commercialization have resulted in the availability of consistently high-quality, well-characterized, low cost alloys and a renewed interest in SMA as a waste heat energy recovery technology. The Lightweight Thermal Energy Recovery System (LighTERS) is an ongoing ARPA-E funded collaboration between General Motors Company, HRL Laboratories, Dynalloy, Inc., and the University of Michigan. In this paper we will present initial results from investigations of a closed loop SMA thermal engine (a refinement of the Dr. Johnson design) using a helical coil element and forced-air heat exchange. This engine generates mechanical power by continuously pulling itself through separate hot and cold air streams using the shape memory phase transformation to alternately expand and contract at frequencies between 0.25 and 2 Hz. This work cycle occurs continuously along the length of the coil loop and produces steady state power against an external moment. We present engine features and the thermal envelope that resulted in devices achieving between 0.1 and 0.5 W/g of shape memory alloy material using only forced air heat exchangers and room temperature cooling. © 2011 by ASME.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9780791854716
Editorial:
American Society of Mechanical Engineers

Tipo de producto:
Conference Paper

DOI:
10.1115/smasis2011-5212