Fabrication and Output Power Characteristics of Heat-Engines Using Tape-Shaped SMA Element

Cho, Hiroki; Takeda, Yoichi; Sakuma, Toshio

doi:10.1007/978-3-319-53306-3_1

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…After rigorous investigation, it was concluded that the material has a unique property [44] that made it different from other alloy materials and then named it NITINOL associating it to the laboratory. This alloy can recover energy up to 10 6 J m −3 , and the transformation temperature depends on Ni-content with an upper limit of 363 K [45].…”

Section: Phase Transformation In Smamentioning

confidence: 99%

“…This engine operates between hot water and cold air at room temperature. Sometime to increase the power output of an SMA engine, the surface area is increased by using a rectangular SMA belt [45,79]. Tanaka constructed and analyzed an unsynchronized rectangular belt type NiTi SMA heat engine.…”

Section: Unsynchronized Pulley Engines Typementioning

confidence: 99%

“…Therefore, the device will tend to sink [92]. Cho et al developed another type of heat engine using spiral NiTi SMA spring [45]. In the design, one end of a helical NiTi SMA spring is attached to a shaft at the center axis of a container, and the other end to the surface of the container.…”

Section: Miscellaneous Categorymentioning

confidence: 99%

“…Also, the rate of cooling could be increased by incorporating a cooling system. Cho et al used this idea and developed a synchronized pulley-tape NiTi SMA belt heat engine and incorporated a cooling mechanism, and the engine is able to generate power of 0.09 W at a temperature difference of 60 • C [45,103]. According to this research, factors like heating and cooling rate, and SMA wire size, determines the final output power.…”

Section: Efficiency and Thermodynamics Thermal Recovery Of The Sma He...mentioning

confidence: 99%

“…From literature, it is observed that the efficiency of the SMA heat engine is less than 10% [45], and this is the major drawback of this type of engine. Other SMA engine challenges can also exist.…”

Section: Sma Heat Engine Limitationsmentioning

confidence: 99%

See 4 more Smart Citations

A review on Nitinol shape memory alloy heat engines

Abubakar

Wang

2020

Smart Mater. Struct.

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Nitinol (NiTi) shape memory alloy (SMA) heat engine is a very promising candidate application of SMA since its invention, but yet to be put as commercial due to its low efficiency and performance. In this paper, a review of different types of NiTi SMA heat engine is presented. The review is done based on the following headings: conceptual design, constitutive driving model, the performance of the engine, and engine limitations. Factors like temperature, cooling rate, size of NiTi SMA element, and the stretch ratio of NiTi SMA spring were identified as determinants of final output power and efficiency of SMA heat engines. It is found that a crankshaft NiTi SMA heat engine produced the highest power output value of 4 watt, an unsynchronized pulley NiTi SMA heat engine with 11.3% of engine efficiency has the highest engine performance so far recorded. Some engine's drawbacks like an improper driving model, drag loss, backsliding were identified as the major problem affecting the engine performance, and which, if solved, will increase the overall performance and efficiency for future development toward its commercialization.

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Section: Phase Transformation In Smamentioning

confidence: 99%

Section: Unsynchronized Pulley Engines Typementioning

confidence: 99%

Section: Miscellaneous Categorymentioning

confidence: 99%

Section: Efficiency and Thermodynamics Thermal Recovery Of The Sma He...mentioning

confidence: 99%

Section: Sma Heat Engine Limitationsmentioning

confidence: 99%

See 3 more Smart Citations

A review on Nitinol shape memory alloy heat engines

Abubakar

Wang

2020

Smart Mater. Struct.

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Ocean Thermal Energy Harvester using shape memory alloy spring

Abubakar

Wang

2021

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Geothermo-mechanical energy conversion using shape memory alloy heat engine

A.,

2024

J Mater. Sci: Mater Eng.

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The shift towards renewable energy sources like geothermal energy has become desirable due to the recurrent energy crisis and global warming challenges influenced by fossil fuels. Geothermo-mechanical energy conversion using shape memory alloy (SMA) heat engines presents a novel and sustainable approach for harnessing geothermal energy. Shape memory alloys, known for their ability to undergo reversible phase transformations driven by temperature changes, are ideal for thermal-to-mechanical energy conversion. This paper explores the design and performance of an SMA heat engine that utilizes geothermal heat sources to drive mechanical work. The engine operates by cycling between the high-temperature geothermal environment and a cooler sink, exploiting the shape memory effect to generate mechanical motion. By integrating geothermal energy and SMA technology, this system offers a potential solution for renewable energy generation, with applications in remote or off-grid locations. The paper also investigates output power and the thermodynamic efficiency. A model is formulated and the engine behavior is simulated. A series of experiments are conducted for engine output power and efficiency. The model is compared to the experimental data for validation. The engine developed a maximum power of 3.5, 8.5, and 11.5 watts at 60, 80, and 90 °C respectively. The proposed SMA-based geothermo-mechanical energy conversion system offers a promising solution for efficient, reliable, and scalable geothermal energy harvesting. This research contributes to the development of innovative, efficient geothermal energy conversion technologies, supporting global renewable energy goals and reducing greenhouse gas emissions. This innovative energy conversion mechanism could play a key role in the future of sustainable power generation.

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Fabrication and Output Power Characteristics of Heat-Engines Using Tape-Shaped SMA Element

Cited by 4 publications

References 8 publications

A review on Nitinol shape memory alloy heat engines

A review on Nitinol shape memory alloy heat engines

Ocean Thermal Energy Harvester using shape memory alloy spring

Geothermo-mechanical energy conversion using shape memory alloy heat engine

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