Energy Conversion in Shape Memory Alloy Heat Engine Part I: Theory

Zhu, Jintian; Liang, Ning; Liew, K.M.; Huang, Weiming

doi:10.1106/amfv-fpqq-rnbk-ee50

“…The aim of this paper is to apply the theoretical model present in Part I (Zhu et al, 2001a) to simulate the behavior of a twin crank NiTi spring based heat engine. This heat engine has been experimentally studied by Iwanaga et al (1988).…”

Section: Introductionmentioning

confidence: 99%

Energy Conversion in Shape Memory Alloy Heat Engine Part II: Simulation

Zhu

¹

,

Liang

²

,

Huang

³

et al. 2001

Journal of Intelligent Material Systems and Structures

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In this paper, a theoretical model proposed in Part I (Zhu et al., 2001a) is used to simulate the behavior of a twin crank NiTi SMA spring based heat engine, which has been experimentally studied by Iwanaga et al. (1988). The simulation results are compared favorably with the measurements. It is found that (1) output torque and heat efficiency decrease as rotation speed increase; (2) both output torque and output power increase with the increase of hot water temperature; (3) at high rotation speed, higher water temperature improves the heat efficiency. On the contrary, at low rotation speed, lower water temperature is more efficient; (4) the effects of initial spring length may not be monotonic as reported. According to the simulation, output torque, output power and heat efficiency increase with the decrease of spring length only in the low rotation speed case. At high rotation speed, the result might be on the contrary.

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“…Consider a unit length of NiTi wire and ignoring heat source term, i.e., let _ r r ¼ 0 in Equation (62) of Zhu et al (2001a). Then, Equation (62) of Zhu et al (2001a) yields…”

Section: Simulation Methodsmentioning

confidence: 99%

“…Readers may refer to Zhu et al (2001a) for the details of derivation and the meanings of various symbols.…”

Section: Simulation Methodsmentioning

confidence: 99%

Energy Conversion in Shape Memory Alloy Heat Engine Part II: Simulation

Zhu¹,

Huang²,

Liang³

et al. 2001

j intell mater sys struct

Self Cite

View full text Add to dashboard Cite

In this paper, a theoretical model proposed in Part I (Zhu et al., 2001a) is used to simulate the behavior of a twin crank NiTi SMA spring based heat engine, which has been experimentally studied by Iwanaga et al. (1988). The simulation results are compared favorably with the measurements. It is found that (1) output torque and heat efficiency decrease as rotation speed increase; (2) both output torque and output power increase with the increase of hot water temperature; (3) at high rotation speed, higher water temperature improves the heat efficiency. On the contrary, at low rotation speed, lower water temperature is more efficient; (4) the effects of initial spring length may not be monotonic as reported. According to the simulation, output torque, output power and heat efficiency increase with the decrease of spring length only in the low rotation speed case. At high rotation speed, the result might be on the contrary.

show abstract

“…Such applications are focused on the development of sensor/actuator devices, which were recently applied to energy recovery [1][2][3][4][5][6]. Some of these applications would be quite complicated if conventional materials were used.…”

Section: Introductionmentioning

confidence: 99%