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Investigates the effects of intake temperature on power generation in free piston expanders, suggesting optimization strategies.
The Free Piston Expander-Linear Generator is a high-performance Organic Rankine Cycle waste heat recovery technology. Based on a Free Piston Expander-Linear Generator experimental platform, this paper experimentally investigates the effects of intake temperature on the system’s piston motion, electrical output and energy conversion efficiency. Higher intake temperature elevates piston displacement, velocity and motion symmetry, and positively correlates with the generator’s output voltage and power, which hits a maximum of 31.06 W at 3.5 bar intake pressure and 20 Ω load resistance. A 3.5 bar pressure boosts the average power by 15 %-20 % compared with 3.0 bar, and a temperature-pressure synergy is observed: the output improvement induced by temperature is more prominent at low pressure, while its marginal effect weakens at high pressure. The energy conversion efficiency of the Free Piston Expander-Linear Generator rises with temperature but declines with increasing pressure and external load, with a maximum value of 41.03 % achieved in this study.
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Yuwen et al. (2026) studied this question.
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