技术中心

【摘要】 具有固定内容积比的涡旋压缩机存在当外压缩比小于其内压缩比时内容积效率较快下降的问题,由于空调制冷(热泵)系统大部分时间运行在偏向小室内外温差工况即小压缩比工况下,此时压缩机处于过压缩工况,故制冷(热泵)系统的效率低下;同时,随着系统压缩比的减小,会出现建筑的供冷/供热负荷下降和系统的供冷/供热能力上升的矛盾,系统存在降容的需求。为解决小压缩比工况下压缩机效率降低和系统容量过大的问题,提出一种带制冷泄出功能的涡旋压缩机制冷系统,采用模拟分析和实验测量方法,对其技术可行性进行研究,结果显示:合理适度的制冷剂泄出能有效提高压缩机在过压缩工况下的内容积效率,提高系统的COP并减小制冷系统的制冷/制热能力,是一项极具潜力的制冷系统调节技术。 【Abstract】 The inner volume efficiency of constant-volume-ratio compressors declines fast when the difference between indoor temperature and outdoor temperature decreases,especially for the refrigeration(heat pump) systems used in air-conditioning,leading to the poor performance of these systems.In addition,with the decrease of the compression ratio,the heating/cooling requirement drops,but the heating/cooling capacity of the refrigerating system rises.In our research,a novel scroll compressor refrigeration system with refrigerant release was developed.Both simulation and experiment were conducted to study the feasibility of the present system.The result shows that the refrigerant release method can raise the inner volume efficiency of the compressor under over-compression condition and reduce the heating/cooling capacity,and thus enhance the COP of the system effectively. 【关键词】 热工学; 涡旋压缩机; 制冷剂泄出; 仿真 【Key words】 Pyrology; Scroll Compressor; Refrigerant release; Simulation