摘要
压缩机吸气带液可以有效降低排气温度,但也会对压缩机性能产生影响,需要对其深入研究。以R32变频滚动转子式压缩机实验系统为研究对象,通过分析相同频率不同压比和相同压比不同频率时压缩机容积效率随压缩机吸气状态的变化规律,建立了半经验压缩机模型。研究结果表明:(1)压缩机吸气过热时,过热度对压缩机容积效率基本无影响;少量吸气带液时,容积效率均随吸气干度的减小线性降低,各频率和各压比斜率基本相同。另外,系统COP与压缩机容积效率随吸气状态的变化趋势相似;(2)压缩机模型经实验验证,计算值与实验值最大相对误差为1.51%,最小相对误差为0.03%,具有较好的可靠性,可以减少试验次数,并能准确预测出压缩机性能;(3)压缩机运行性能在低频率、低吸气干度时迅速恶化,因此模型适用于压缩机频率高于额定频率、吸气干度大于0.90的运行工况。
Although wet compression could decrease the compressor discharge temperature,it has effects on performance of compressor,which should be focused. The volumetric efficiency of R32 variable frequency rotary compressor with same frequency and different pressure ratios,then with same pressure ratio and different frequencies,varying with different compressor suction status is analyzed in this paper. According the conclusion and experimental data,the semi-empirical model was presented. Results showed that when the refrigerant status of compressor suction was superheated,the superheated temperature has less effect on the volumetric efficiency. When the status was at two phase,the volumetric efficiency decreased linearly with the suction vapor quality. The slopes at each frequency and pressure ratio were the same. The tendencies of the coefficient of performance varying with compressor suction state under experimental conditions were the same as that of the volumetric efficiency. In addition,by comparing theoretical value through the model with the experimental data,the maximum relative error is 1.51%,and the minimum is 0.03%,which demonstrates the precision of the model. The noteworthy phenomenon is that the performance of compressor is worsen when operating at lower frequency and suction vapor quality,which means the model is suitable for the operating condition with the frequency higher than the rated frequency and the suction vapor quality greater than 0.90.
作者
虞中旸
陶乐仁
王超
沈冰洁
YU Zhongyang TAO Leren WANG Chao SHEN Bingjie(Institute ofRefrigemtion and Cryogenics, University of Shanghai for Science and Technology, Shanghai200093, Chin)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第3期832-838,共7页
Chemical Industry and Engineering Progress
基金
上海市动力工程多相流动与传热重点实验室项目(13DZ2260900)
关键词
热力学
变频压缩机
模型
两相
thermodynamics
variable frequency compressor
model
two phase
