Device & Products IV: Chiller and Refrigerant
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本场研讨会主讲嘉宾之一
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8月25日下午1：00-5：30，主题为"Device & Products IV: Chiller and Refrigerant（装置和产品：制冷和制冷机）"在北京国际会议中心307会议室召开。
演讲内容摘要：
The incorporated compressor-expander mechanism is a useful method of recovering work from the expansion/throttling stage of a refrigeration cycle. This paper studies the rotary-vane compressor-expander with R-134a as the working refrigerant. To improve the mechanical efficiency of the compressor,a detailed mathematical model of the frictional forces is created. Viscous shear losses caused by the lubrication additives,vane tip frictional losses and sealing losses are mathematically modelled as functions of various fluid and geometrical parameters of the compressor-expander. Results from the model correlate well with the experimental data obtained. As such,the model can be used to achieve improvements in system efficiency. It is seen that for a certain maximum operating speed there is an optimum rotor end face clearance to use before the power loss due to viscous shear overcomes the power lost from leakage. Better internal lubrication is also observed to reduce the overall power consumption of the unit.
现场提问
第22届国际制冷大会于2007年8月21日在北京国际会议中心隆重召开，会议为来自世界各地的科学家和工程师提供一个互相交流和分享各自成功经验的机会，以使制冷技术在今后几十年保持持续快速的发展。
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