无油线性压缩机变容量制冷性能实验研究

Experimental research on variable refrigerating volume performance of oil-free linear compressor

无油线性压缩机具有结构简单紧凑、效率高和寿命长等优点,在航空航天热控领域具有巨大的发展潜力。针对实验室研制的无油线性压缩机进行变容量制冷性能研究,分析行程和余隙容积变化对压缩机的制冷性能受的影响。实验结果表明,在冷凝温度为48℃,蒸发温度为10℃,热沉温度维持15℃,行程从6.5 mm增加到8.9 mm时,压缩机的制冷量会随行程的增大而增大。在行程为8.9 mm时,最大制冷量为180 W;系统的COP和压缩效率会随着行程的增大先增大后减小,在行程为7.9 mm时,具有最高COP和压缩效率,分别为1.78%和30.6%。在冷凝温度为55℃,蒸发温度为10℃,热沉温度稳定在15℃,系统的余隙长度从0.1 mm增加到1.1 mm时,随着余隙长度的增加,压缩机的制冷量、COP和压缩效率会逐渐降低。电机效率会随着余隙容积的增加先升高后降低,在余隙长度为0.9 mm时,电机效率为78.4%。

The oil-free linear compressor is an attractive proposition for electronics cooling application of aerospace thermal management with the advantages of simple and compact structure, high efficiency and long life. In this paper, the variable capacity refrigeration performance of the oil free linear compressor is studied, and the influence of stroke and clearance volume of compressor on the performance of the compres- sor is analyzed. The experiment results show that, when evaporation temperature and condensation tempera- ture are 48 ℃, 10 ℃ respectively, and heat sink temperature is maintained at 15 ℃, the cooling capacity of the compressor will increase with stroke. As the stroke changes from 6.5 mm to 8.9 mm, the maximum cooling capacity of the system is 180 W; COP and compression efficiency increase first and then decrease with the increasing of stroke. The system has the highest cooling capacity and COP, respectively I. 78 and 30.6% when stroke is 7.9 mm. While the evaporation temperature and condensation temperature are 55 ℃ and 10 ℃ respectively, heat sink temperature is kept stability at 15 ℃, compressor refrigerating capacity, COP and compression efficiency will reduce gradually with the increase of clearance length increases from 0. 1 mm to 1. 1 mm, and the motor efficiency will increase first and then decrease. When the clearance length is 0. 9 mm, the motor efficiency reaches the highest value of 78.4%.