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Performance Investigation of Capillary Tubes for Machine Tool Coolers Retrofitted with HFC-407C Refrigerant

Chinese Journal of Mechanical Engineering 2012年第5期25卷 933-939页

作者： WANG Fujen CHANG Tongbou CHIANG Weiming lee haochung Department of Refrigeration and Air Conditioning Engineering Chin-Yi University of Technology Department of Mechanical Engineering Southern Taiwan University Energy & Environment Research Laboratories Industrial Technology Research Institute

The machine tool coolers are the best managers of coolant temperature in avoiding the deviation of spindle centerline for machine tools. However, the machine coolers are facing the compressed schedule to phase out the HCFC （hydro-chloro-floro-carbon） refrigerant and little attention has been paid to comparative study on sizing capillary tube for retrofitted HFC （hydro-floro-carbon） refrigerant. In this paper, the adiabatic flow in capillary tube is analyzed and modeled for retrofitting of HFC-407C refrigerant in a machine tool cooler system. A computer code including determining the length of sub-cooled flow region and the two phase region of capillary tube is developed. Comparative study of HCFC-22 and HFC-407C in a capillary tube is derived and conducted to simplify the traditional trial-and-error method of predicting the length of capillary tubes. Besides, experimental investigation is carried out by field tests to verify the simulation model and cooling performance of the machine tool cooler system. The results from the experiments reveal that the numerical model provides an effective approach to determine the performance data of capillary tube specific for retrofitting a HFC-407C machine tool cooler. The developed machine tool cooler system is not only directly compatible with new HFC-407C refrigerant, but can also perform a cost-effective temperature control specific for industrial machines.

关键词： machine tool cooler capillary tube refrigerant retrofitting

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Experimental Investigation of Capacity Control Scheme on System Performance for a Machine Tool Cooler

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Chinese Journal of Mechanical Engineering 2011年第3期24卷 333-339页

作者： WANG Fujen CHANG Tongbou KAO Jianwei lee haochung Department of Refrigeration Air Conditioning and Energy Engineering Chin-Yi University of Technology Taiehung 411 Taiwan China Department of Mechanical Engineering Southern Taiwan University Tainan 710 Taiwan China Energy and Environment Research Laboratories Industrial Technology Research Institute Hsinchu 310 Taiwan China

Highly accurate manufacture in machining industry can only be obtained with precise temperature control of the coolant （oil or water）.Machine tool with more accurate,stable and advanced the precision of the working component cannot be developed without appropriate ***,the machine tool coolers are facing the control hunting of cooling temperature and the dramatic variation of heat load in high-accuracy *** main objective of this study is to evaluate the influence of the hot-gas by-pass scheme and suction regulation for capacity control of a machine tool cooler *** this study,experimental investigation on both hot-gas by-pass scheme and suction valve regulation for capacity control has been *** of using capillary tube and thermostatic expansion valve along with different capacity control scheme have been investigated extensively in an environmental testing *** performance and power consumption of the cooler system have been measured and analyzed as well by comparing with different opening percentage of throttling valve under specific coolant *** experimental results reveal that the power consumption will reduce slightly by capacity control using the hot-gas by-pass scheme but the coefficient of performance （COP） of the overall system will *** coolant temperature will result in higher compressor power consumption as *** conducting suction valve regulating for capacity control,energy-saving at 10%-12% can be obtained by using thermostatic expansion valve under different evaporator *** also reveals that suction valve regulation along with adequate choice of thermostatic expansion valve can provide alternative choice for steady capacity control and substantial *** proposed cooler systems with different capacity control schemes are not only more cost-effective than inverter driven system,but also can perform energy-saving and precise temperature control specific for high-accur

关键词： machine tool cooler hot-gas by-pas suction regulation capacity control

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