热泵涡旋压缩机的热力学特性

Thermodynamic characteristics of heat pump scroll compressor

基于热泵涡旋压缩机几何参数、热力学第一定律、质量能量守恒定律等,建立了热泵涡旋压缩机的几何模型和热力学模型.利用欧拉法对所建热力学模型进行求解,得到了压缩机运行1个周期工作腔内工质温度、压力、质量的变化规律,并进一步分析了不同工况条件下热泵涡旋压缩机工作过程中泄漏量的变化规律.同时,通过搭建实验平台对所建热力学模型进行了验证.结果表明:吸气压力和吸气温度对压缩腔的影响最大,吸气压力降低0.1 MPa时第三压缩腔泄漏量降低9.45%,吸气温度降低5℃时第三压缩腔泄漏量降低6.841%;而转速的变化对涡旋压缩机各个工作腔泄漏量的影响比较平均;且实验值与模拟值接近,验证了模型的正确性,可为热泵涡旋压缩机的性能优化提供一定的理论参考.

Based on the geometric parameters of heat pump scroll compressor,first law of thermodynamics,the laws of conservation of mass and energy and so on,the geometric model and thermodynamic model of the heat pump scroll compressor were established in this paper,and the method of Euler was used to solve this model,then the changing trend of temperature,pressure and mass of working fluid in the working chamber of compressor were obtained.The leakage changing law of the heat pump scroll compressor under different working conditions was analyzed.Finally,the established thermodynamic model was verified by building a test platform.The results show that the suction pressure and temperature have the greatest influence on the compression chamber.When the suction pressure decreases by 0.1 MPa,the leakage of the third compression chamber decreases by 9.45%.When the suction temperature decreases by 5℃,the leakage of the third compression chamber decreases by 6.841%.While the influence of speed change on the leakage of each working chamber of scroll compressor is average,and the experiment values are close to the simulation values,which verifies the correctness of the model.The research in this paper provides a some theoretical reference for the performance optimization of the scroll compressor of heat pumps.