Srirussamee, Kasama

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Srirussamee, Kasama
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kasama.sr@kmitl.ac.th

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    Item type:Publication,
    Thermomechanical performance of the offset crankshaft heat engine driven by tinicu shape memory alloys
    (2021-01-01)
    Srirussamee, Kasama
    ;
    Khantachawana, Anak
    ;
    Hok, Bunheng
    ;
    Phukaoluan, Aphinan
    Geothermal hot springs are among the alternative clean energy sources to the fossil fuels for mitigating the current global warming crisis. However, the accessible geothermal water at the surface was mostly at low temperature, which impairs the practicality of harvesting these energy. Shape memory alloys (SMAs), which deform through the increased temperature, were adapted into the rotating mechanism as the actuators with the aims to convert the low-temperature heat into the mechanical work. This study utilized the helical spring-shaped TiNiCu SMAs as the actuators for the offset crankshaft heat engine. Performance of this engine was evaluated using rope brake dynamometer, by which the rotational speed, torque, and power were measured at the water temperature from 55-85°C. The results show that the engine performance increased with increasing water temperature and was dependent on the crankshaft arrangement. The offset angle of 30° was found to be optimal in this study with maximum torque of more than 5.8 N∙m and maximum power of 3.9 W at 15.7 rpm when operating at water temperature of 85°C. This study shows that the heat engine driven by TiNiCu SMAs could harvest low-temperature energy from the geothermal hot springs with the maximum observable efficiency of around 1.4%.
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    Influence of the Oxide Film on the Performance and Corrosion Resistance of TiNiCu Shape Memory Alloys as the Heat Engine Actuator
    (2024-10-01)
    Phukaoluan, Aphinan
    ;
    Srirussamee, Kasama
    ;
    Khantachawana, Anak
    ;
    Chuchonak, Monthon
    ;
    Tunthawiroon, Phacharaphon
    Shape memory alloys (SMAs) are utilized as an actuator for the heat engine to harvest energy from low-temperature geothermal sources, such as hot springs, which convert thermal energy into mechanical work. However, the alloy processing and engine design still require optimization to improve performance and durability. To discuss their potential as heat engine actuator, this study investigated the influence of oxide films on the TiNiCu SMAs in terms of surface and structural properties, recovery forces, and corrosion resistance. The results show that the surfaces of the etched samples were relatively coarser than those unetched with lower oxygen content. With the presence of oxide film, the Austenite Finish Temperature (Af) temperature of the unetched SMAs was lower with R-phase transformation. Also, it provided higher recovery force at above Af temperature (as high as 8.3 N at 70-mm displacement). Furthermore, the corrosion resistance of the unetched SMAs was higher than the etched samples, as analyzed by open-circuit potential and linear polarization in natural spring water at 70°C. These findings imply that the presence of oxide film could be beneficial for the SMAs when used as an actuator for heat engines, although it may require further study to investigate its impact on the fatigue behavior of the alloys.