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- W4308344186 abstract "The paper introduces a new type of heat engine actuated by shape memory alloy (SMA) commercial wires. The originality of the design consists in using two SMA active elements that are martensitic at room temperature (RT) and compensate each other in such a way that each element becomes, on a turn, austenitic while the other is martensitic and vice-versa. The SMA wires were manufactured from Ti50Ni45Cu5 SMAs undergoing thermoelastic martensitic transformation characterized, among other things, by superior stiffness of austenitic state as compared to martensitic state. This feature has enabled thermoelastic SMAs to develop work generating shape memory effect (SME), while undergoing reverse martensitic transformation, during heating. Based on this principle, solid state heat engines have been built even since the discovery of SMAs. The paper reviews the most prominent types of SMA driven solid state engines, before introducing a new type of engine. In the present heat engine constructive solution, solar energy is used to directly heat up the active element, which has a straight austenitic “hot shape” and was bent into a curved shape at RT, while being in martensitic state. During heating, the element becomes fully austenitic, partially recovers its straight shape, by decreasing its curvature radius, and bents the bias martensitic element which is softer. The latter will be brought with its most deformed area into the focus of an optical lens, thus being instantly heated up. It develops, in its turn, work generating SME. Based on this principle, a linear-alternative heat engine has been patented. Its functioning principle was tested for different numbers of heating–cooling cycles. By means of an original testing setup, using hot air heating and sprayed water cooling, the variations of displacement with temperature were recorded and the critical temperature for then start of reverse martensitic transformation (As) was determined." @default.
- W4308344186 created "2022-11-11" @default.
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- W4308344186 date "2023-01-01" @default.
- W4308344186 modified "2023-09-28" @default.
- W4308344186 title "Development of an alternating heat engine, actuated by shape memory alloys" @default.
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- W4308344186 doi "https://doi.org/10.1016/j.matpr.2022.10.226" @default.
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