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Organic ranking cycle–stirling engine efficiency in small scale industrial solar energy conversion in delta state, nigeria
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This study analyzed the performance of hybrid ORC -Stirling systems in terms of thermal-mechanical energy conversion in relation to small-scale power generation by industries in Delta state, Nigeria. The two main parameters examined included the thermal collection efficiency of evacuated tube collectors and the influence of the environmental parameters on the stability of torque and the power output of the shaft. The data collection was performed on solar irradiance, ambient temperature, wind speed and PCM thermal cycling at 8-hour intervals in 90 days, and analyzed by means of MATLAB-simulated multidimensional plots. Findings showed that evacuated tube collection produced efficiency of ≥65% thermal collection efficiency, providing sufficient heat input for ORC–Stirling systems to maintain torque deviations within ±5% and conversion efficiency ≥40%. Mean solar irradiance of 775W/m²and PCM cycling between 250–310°C supported continuous 8-hour daily operation of industrial machinery. The results showed that hybrid ORC-Stirling systems are reliable to drive small-scale industrial processes even when environmental conditions vary. It was therefore advised that the small-scale operators should invest in ORC-Stirling systems, the Manufacturer Association of Nigeria (Delta State Chapter) should create awareness and demonstrations of this hybrid ORC-Stirling system and tertiary institutions in Delta state should engage the faculties of Mechanical Engineering to conduct training and pilot projects to facilitate adoption and proper maintenance of this ORC-Stirling system. Such measures will further improve operational stability, cut down-time and sustainability and decentralized industrial power
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