Browsing by Author "Liu, Yangguang"

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Design optimization of scroll compressor applied for frictional losses evaluation
(2010-05-01)
Liu, Yangguang
;
Hung, Chinghua
;
Chang, Yuchoung
;
機械工程學系
;
Department of Mechanical Engineering
This paper develops a design optimization procedure in scroll-type compressor (STC). By integrating the verified STC simulation model with an optimum solver, a frictional losses reduced problem of bearing components has been investigated. After the optimum search, the frictional losses can be reduced in range of 14.1-18.1% at all testing conditions with specified constraints. Herein, the design modifications of crank and upper bearings are compromised between reduction of frictional losses and maintenance of hydrodynamic lubrication. In addition, the narrower and shorter design of lower bearing and smaller one of thrust bearing can reduce frictional losses too. Furthermore, wider selection of materials in all the bearings can be adopted with the satisfied strength constraint. By using this procedure, various optimum combinations of parameters can be found for different STC design considerations. (C) 2010 Elsevier Ltd and IIR. All rights reserved.
Mathematical model of bypass behaviors used in scroll compressor
(2009-04-01)
Liu, Yangguang
;
Hung, Chinghua
;
Chang, Yuchoung
;
機械工程學系
;
Department of Mechanical Engineering
This paper has constructed a bypass mechanism mathematical model in scroll-type compressor (STC) and has been integrated into a simulation package to predict the STC performance. The bypass mechanism,when added to a fixed scroll, is used to prevent over-compression and liquid slugging. Under five specified operating conditions, it was found that the STC with the bypass action increased the isentropic efficiency 2.5-10% more than the STC without the bypass action. Meanwhile, the calculated results of the developed model have been validated by a STC testing apparatus. In addition, it was found that the design of the bypass mechanism in the paper, can completely avoid over-compression and pressure discrepancy while the STC is in operation. (C) 2008 Elsevier Ltd. All rights reserved.
Study on involute of circle with variable radii in a scroll compressor
(2010-11-01)
Liu, Yangguang
;
Hung, Chinghua
;
Chang, Yuchoung
;
機械工程學系
;
Department of Mechanical Engineering
A geometric model of scroll profiles, constructed from an involute of circle with variable radii, has been developed by using the theorem of planar orbiting mechanisms. Parametric studies have also been investigated in this study. When compared to the conventional scroll profile with the same suction volume, volume ratio and housing size, this new model demonstrates better reliability and efficiency because of a lower wrap height. Alternatively, a scroll type compressor with a more compact housing size can be achieved by using this new profile but keeping its wrap height the same as the conventional one. Furthermore, arc and line modifications have been built to provide wider design varieties. These are used to avoid interference at the center of the scroll pair and to boost the volume ratio of this new scroll profile. (c) 2010 Elsevier Ltd. All rights reserved.