Numerical study of a free-piston Stirling generator at different temperature ratios
To boost both the output power and thermoelectric conversion efficiency of the free-piston Stirling power system,based on the key parameters of the Stirling machine are simulated by the Sage software to investigate how key parameters affect the generator's output power and thermo-electric conversion efficiency across varying temperature ratios.The results show that at different temperature ratios,the phase angle of 80° and 50° corresponds to the highest output power and thermoelectric conversion efficiency,and the increase of inflation pressure has a significant effect on the increase of output power,however,its impact on thermoelectric conversion efficiency is mini-mal;conversely,increasing the cold-end temperature at the same temperature ratio has a greater effect on both output power and thermoelectric conversion efficiency compared to increasing the hot-end temperature,but when the temperature ratio is 2.5,the cold end temperature is higher than 430 K,and the thermoelectric conversion efficiency is higher than that of the cold end temperature,and the temperature of the cold end is higher than 430 K.But when the temperature ratio is 2.5,the cold end temperature is higher than 430 K,the thermoelectric conversion efficiency is reduced.
Stirling generatorthermoelectric conversion efficiencyphase anglepressure temperature ratio
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