高效双级离心式制冷压缩机气动优化设计及应用

发布时间：2018-11-17 14:00

【摘要】：当前能源紧张问题日益突出,并成为关乎人类可持续发展的全球性问题。在我国,公共建筑能耗约占全社会总能耗的30%左右,而暖通空调系统的能耗就占了建筑物能耗的40%~50%。因此,暖通空调系统为建筑节能担负着重要的责任。离心式冷水机组具有单机制冷量大、占地面积小、可靠性好等优点,逐渐成为大中型建筑空调机组的首选产品,越来越多的受到市场的广泛青睐。本文从大型离心式水冷冷水机组性能优化的角度出发,对美的公司现有的一款2000RT双级离心式制冷压缩机进行气动优化设计达到效率提升的目的。通过双级压缩制冷循环分析确定了最佳的中间压力。然后,运用Concepts NREC专用设计软件中的COMPAL模块进行双级离心式制冷压缩机的气动一维优化设计。随后,采用自由曲面和全三元流叶轮设计方法并利用Blade Gen软件完成各气动部件的三维几何造型。紧接着采用ANSYS软件Turbo Grid和CFX模块对各气动部件进行网格划分和CFD分析优化。最后,通过叶轮结构设计和Hyper Works软件对叶轮进行静力学强度分析和校核。气动优化设计后的高效双级离心式制冷压缩机等熵效率达88.22%。采用此压缩机的美的超高效离心式冷水机组LC2000ES通过权威检测机构的认证,国标工况下机组满负荷COP高达7.11,达到并超过能效等级1级(COP大于等于6.1W/W)。该产品经专家鉴定委员会验收,机组能效国际领先,具有显著的经济效益和社会效益。
[Abstract]:At present, the problem of energy shortage is becoming more and more prominent, and it has become a global problem related to the sustainable development of human beings. In China, the energy consumption of public buildings accounts for about 30% of the total energy consumption of the whole society, while the energy consumption of HVAC system accounts for 40% of the building energy consumption. Therefore, HVAC system plays an important role in building energy saving. Centrifugal chiller has the advantages of large refrigerating capacity, small area, good reliability and so on. It has gradually become the first choice of large and medium-sized building air conditioning units, and more widely favored by the market. In this paper, from the point of view of performance optimization of large centrifugal water cooled chillers, the aerodynamic optimization design of a 2000RT two-stage centrifugal refrigeration compressor is carried out to achieve the purpose of improving efficiency. The optimum intermediate pressure is determined by the analysis of two-stage compression refrigeration cycle. Then, the one-dimensional aerodynamic optimization design of two-stage centrifugal refrigeration compressor is carried out by using the COMPAL module in the special design software of Concepts NREC. Then, the design method of free surface and three dimensional flow impeller is adopted, and the 3D geometric modeling of each pneumatic component is completed by using Blade Gen software. Then the ANSYS software Turbo Grid and CFX module are used to mesh the pneumatic components and CFD analysis optimization. Finally, the statics strength of impeller is analyzed and checked by impeller structure design and Hyper Works software. The isentropic efficiency of the high efficiency two-stage centrifugal refrigeration compressor after aerodynamic optimization design is 88.22. The LC2000ES of the super high efficiency centrifugal chillers using this compressor has been certified by the authoritative testing organization. Under the national standard condition, the full load COP of the unit is as high as 7. 11, which reaches and exceeds the energy efficiency grade 1 (COP is greater than or equal to 6.1W/W). The product has been accepted by the expert appraisal committee, the unit energy efficiency is leading in the world, with remarkable economic and social benefits.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB652

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