| 摘要: |
| 针对两级压缩技术在中小容量冷水机组中鲜少应用的现状，本文设计了一种名义制冷量为615.48 kW的两级压缩水冷螺杆式冷水机组，采用新型转子型线和结构设计研制了两级变频螺杆制冷压缩机，并依据国家标准对开发的压缩机和冷水机组进行实验测试。结果表明，本文研发的两级变频螺杆制冷压缩机容积效率普遍高于96%，等熵效率最高达84.4%；冷水机组在出水温度为7 ℃的名义工况下COP达7.01，相比国标GB 19577—2015规定的一级能效水平高16.83%，部分负荷综合性能系数IPLV达到10.45，相比国标GB 19577—2015规定的一级能效水平高39.33%。两级压缩技术能够有效提升水冷螺杆式冷水机组的性能，与无中间冷却相比，中间冷却后冷水机组制冷量和COP分别提升11%和8%以上。 |
| 关键词: 冷水机组 螺杆压缩机 两级压缩 中间冷却 |
| DOI： |
| Received:March 29, 2022Revised:June 29, 2022 |
| 基金项目: |
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| Development of an Ultra-high-efficient Two-stage Compression Water-cooled Screw Chiller |
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Zhang Zhiping1,2, Wang Peng3, Wang Chuang3, Wu Xiaokun2, Xing Ziwen3, Fang Youtong3, Wu Lijian3
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| (1.College of Electrical Engineering, Zhejiang University;2.Green Electrical Appliances Inc. of Zhuhai;3.School of Energy and Power Engineering, Xi'an Jiaotong University) |
| Abstract: |
| Because two-stage compression technology is rarely used in small-scale and medium-scale chillers, a two-stage compression water-cooled screw chiller with a nominal cooling capacity of 615.48 kW was designed in this study. A two-stage variable-frequency screw refrigeration compressor was developed by adopting a new rotor profile and structural design. An experimental test was also conducted on the developed screw compressor and chiller according to national standards. The results show that the volumetric efficiency of the two-stage variable-frequency twin-screw refrigeration compressor developed in this study is generally higher than 96% and the maximum isentropic efficiency reaches 84.4%. The coefficient of performance (COP) of the chiller reaches 7.01 under the nominal operating condition in which the outlet temperature of chilled water is 7 ℃. This value is16.83% higher than the first-degree energy efficiency specified in GB 19577—2015 standard. The integrated part-load value is 10.45, which is 39.33% higher than the first-degree energy efficiency specified in GB 19577—2015 standard. Furthermore, the two-stage compression technology effectively improved the performance of the water-cooled screw chiller. Compared with those of the case without intermediate cooling, the cooling capacity and COP of the chiller with intermediate cooling increased by more than 11% and 8%, respectively. |
| Key words: water chiller unit screw compressor two-stage compression intermediate cooling |
