Properties of Refrigerants and Secondary Working Fluids I
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本场研讨会主讲嘉宾之一
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8月23日下午1：00-5：00，主题为"Properties of Refrigerants and Secondary Working Fluids I（制冷和生产车间保护）"在北京国际会议中心305-C会议室召开。
演讲内容摘要：
Mechanically pumped 2-phase fluid loops often have the problem of insufficient sub-cooling to operate the pumps without cavitation. This paper describes the use of 2-phase accumulators for controlling CO2 loops to obtain forced sub-cooling and accurate evaporator control. The technique of using 2-phase accumulators for loop control was first applied in satellite cooling.
Two accumulator controlled loops have been successfully developed at NIKHEF. One CO2 loop for cooling the AMS particle detector which will study cosmic radiation onboard the International Space Station and a second CO2 loop is developed for cooling the LHCb-VELO particle detector which will study CP-violation at the CERN laboratory in Geneva (Switzerland).
A 2-phase accumulator has the advantage of controlling the evaporator and condenser pressures independent of the primary cooler temperature. It is therefore possible to create as much sub-cooling for the pump as desired. It is even possible to operate the loop in single phase,a feature which turns out to be very convenient during start-up and cooling-down procedures. A 2-phase accumulator for evaporator pressure control in combination with an internal heat exchanger between the liquid feed and the 2-phase return line creates a very stable evaporator with a guaranteed evaporation at low vapor qualities. In this way the evaporator heat transfer can be tuned and evaporator dry-out is prevented.
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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