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dc.contributorMulti-disciplinary Studiesen_US
dc.contributorDepartment of Building Services Engineeringen_US
dc.creatorChan, Kin-hung-
dc.identifier.urihttps://theses.lib.polyu.edu.hk/handle/200/1461-
dc.languageEnglishen_US
dc.publisherHong Kong Polytechnic University-
dc.rightsAll rights reserveden_US
dc.titleOn-line performance evaluation of balancing variable flow secondary chilled water loopen_US
dcterms.abstractBalancing of variable water flow system has aroused different opinions or viewpoints on the advantages and the disadvantages of control performance and energy performance of the systems. Based on those discussions about such issue, variable water flow system has been presumed to work better using dynamic balancing by means of the flow limiting valves. Hence, dynamic models of secondary chilled water loop including the distribution network, the cooling coil, the actuator, the sensor, the variable speed pump, the DDC controller and the flow limiting valve are so developed to simulate the dynamics of the secondary loop chilled water system. On-line performance evaluations can then be carried out under different loads, different operating conditions and different configurations. This dissertation presents the literature findings, the models, the system simulation of the secondary chilled water system and the on-line flow control performance evaluation of the flow limiting valves on the system. Using dynamic balancing but not necessarily installing manual balancing valves, the performance of system can be improved under full loads and part loads conditions. Although the flow limiting valve also has certain limitations in improving the control performance of the system, the installation of those valves at some selective/critical locations is worth recommending.en_US
dcterms.extentviii, 84 leaves : ill. ; 31 cmen_US
dcterms.issued1999en_US
dcterms.educationalLevelAll Masteren_US
dcterms.educationalLevelM.Sc.en_US
dcterms.LCSHWater -- Distributionen_US
dcterms.LCSHRefrigeration and refrigerating machinery -- Automatic controlen_US
dcterms.LCSHHong Kong Polytechnic University -- Dissertationsen_US
dcterms.accessRightsrestricted accessen_US

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Please use this identifier to cite or link to this item: https://theses.lib.polyu.edu.hk/handle/200/1461