Journal of South China University of Technology(Natural Science Edition) ›› 2019, Vol. 47 ›› Issue (9): 24-32,39.doi: 10.12141/j.issn.1000-565X.190031

• Power & Electrical Engineering • Previous Articles     Next Articles

Operational Control Strategy of Non-uniform Load Matching for Multiple Chillers

LIU Xuefeng1 ZHENG Yulan1 WANG Jiaxu1 LU Zhitao2   

  1.  1． School of Electric Power∥Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization， South China University of Technology，Guangzhou 510640，Guangdong，China; 2． Guangdong Refrigeration Society，Guangzhou 510500，Guangdong，China
  • Received:2019-01-23 Revised:2019-04-04 Online:2019-09-25 Published:2019-08-01
  • Contact: 刘雪峰(1976-)，男，副教授，主要从事制冷空调系统优化控制与诊断研究． E-mail:lyxfliu@scut.edu.cn
  • About author:刘雪峰(1976-)，男，副教授，主要从事制冷空调系统优化控制与诊断研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China(51778234)，the Natural Science Foundation of Guangdong Province(2015A030310303)and the Science and Technology Planning Project of Guangdong Province(2017A020216024)

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Abstract: Taking the chiller group with non-uniform cooling capacity as the research object，considering the self- balancing characteristics of cooling capacity，the thermal model of parallel operation of multiple chillers was con- structed，and the parallel operation characteristics of non-uniform load matching chillers under variable load were studied． The optimal control strategy of chiller of the energy efficiency benchmark was compared with the uniform load matching chiller． The applicability of the non-uniform load matching control strategy under the chilled water effluent temperature was discussed． The results show that under the condition of self-balance of cooling capacity， there are energy efficiency benchmarks when multiple chillers are operated in parallel，and the chiller group can achieve the maximum energy efficiency ratio according to the control strategy corresponding to the energy efficiency benchmark． When the load rate of the air conditioning system in this example varies from 14% to 39% and from 43% to 100%，the average energy efficiency ratio of the chiller group is EER≥ 5，and the maximum EER is 5. 43; under the operating conditions of variable chilled water supply temperature，the control strategy of chiller does not change with the effluent temperature of chilled water，and has good applicability; when the chiller selec- tion and matching are carried out in the actual project，the non-uniform load matching method with a small number of chillers operating in parallel to achieve higher overall operating performance should be prioritized．

Key words: chiller, control strategy, load matching, thermal model

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