压缩机转速与回油率对空调性能影响的试验研究

Experimental Study on Influenceof Compressor Speed and Oil Recycle Content on Air Conditioning System

以焓差法原理为基础,利用焓差室搭建汽车空调压缩机试验台架,通过控制系统制冷剂侧、水侧和空气侧相应参数,对相应工况下某型压缩机转速及回油率对系统性能的影响进行研究。结果表明:该型压缩机在800rpm~1100rpm转速下,回油率为5.5%时即可保证压缩机排气温度低于90℃,且在此区间内增大压缩机转速能够提高系统制冷量,并能增大系统的制冷效率;回油率对压缩机功耗和制冷量均有影响,将回油率由3.5%提升至5.5%可有效降低压缩机功耗,不同转速下取得最大制冷量的回油率则有所不同;相同回油率条件下增大压缩机转速可以提高系统制冷效率,而在相同转速下系统制冷效率会随回油率增大呈现先增后减的趋势。

By setting up vehicle compressor platform in the enthalpy chamber,based on enthalpy difference method and used the satisfied way to control the parameters of air,water and refrigerant,then the influence of compressor speed and oil recycle rate can be experimented and the results can be used to evaluate the performance of compressor.The results show that when compressor speed between 800-1100rpm,5.5%oil recycle content can make compressor exhaust temperature below 90℃and increasing compressor speed can increase cooling capacity and cooling coefficient of performance in this range;oil recycle content can influence compressor consumption and system cooling capacity,increasing oil recycle content from 3.5%to 5.5%has advantages to decrease compressor consumption but the oil recycle content when system has the best cooling capacity in different speed is different;increasing compressor speed can increase cooling coefficient of performance and the cooling coefficient of performance will increase first then decrease with oil recycle content increase in the same compressor speed.