COMPUTATIONAL ANALYSIS OF STIRNOL (LOW TEMPERATURE DIFFERENTIAL) HEAT ENGINE
Abstract - Global energy requirement is accelerating on daily basis resulting in energy void which leads to human quest to find simple and cost-effective solutions. A promising resolution is the application of renewable energy with thermo-mechanical conversion systems such as Stirling engines. Considerable effort is in hand at industry and academia domains to stimulate the development of Stirling technology. In this regard two dimensions of engineering i.e. Stirling Engine and Shape Memory Alloy were studied. An encouraging answer for this global pursuit for energy demand is the revival of Stirling engines with the modification of Shape Memory Alloy Nitinol in it. The name of newly modified engine was coined as STIRNOL ENGINE and results reveal that addition of Nitinolspring enhances the overall efficiency of engine demonstrating affirmative impact of shape memory alloy towards performance output of Stirling engine. Moreover, the metallurgy of Stirnol Engine was also changed and its performance was investigated after integration of Nitinol spring. A minimum of four types of materials was utilized in the research namely Aluminum, Copper, Brass and Bronze. In this regard four output parameters were compared and graphically represented. These parameters are engine efficiency, brake power, RPM and temperature difference. Before the conduct of experimentation, Stirnol and Stirling engines were modelled in ANSYS Softwareand computational analysis was conducted even after changing the metallurgy of the engine. Results of both computational and experimental analysis validate each other;therefore, it can be confidently concluded that presence of Nitinol spring has enhanced the efficiency of Stirling engine.
Keywords - Stirling Engines, Shape Memory Alloy, Nitinol, Stirnol Engine