CO_2制冷系统的气冷器用纳米流体强化换热的研究  

Enhancement Heat Transfer of Gas Cooler in CO_2 Refrigeration System using Nanofluids

作　　者：刘业凤[1] 许双[1] 乔海平[1] 王立根[1] LIU Ye - feng XU Shuang QIAO Hai - ping WANG Li - gen(School of Energy and Power Engineering Institute, University of Shanghai for Science and Technology, Shanghai 200093, Chin)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《节能技术》2016年第5期387-391,399,共6页Energy Conservation Technology

基　　金：上海市重点学科建设项目(S30503)

摘　　要：为了提高气冷器换热效率,将纳米流体作为冷却剂应用于跨临界CO_2制冷循环的同轴套管气冷器中。研究纳米流体分别为石墨-H_2O、Al2O3-H_2O、Cu O-H_2O、Cu-H_2O对气冷器换热量以及系统COP的提高情况,以及质量流量和纳米颗粒的体积分数与纳米流体压降之间的关系。建立了物理和数学模型并利用Matlab进行编程模拟计算。结果表明,跨临界CO_2制冷系统的同轴套管气冷器中使用纳米流体作为冷却剂明显提高了换热效率和系统COP,不同的纳米颗粒材料、体积分数以及质量流量的纳米流体使气冷器的换热量和系统COP的提高程度也不同。Nanofluids was applied in concentric - tube gas cooler of transcritical CO2 refrigeration cycle as coolant to enhance heat transfer. The improvement of heat transfer of concentric - tube gas cooler and cooling coefficient of performance （COP） using graphite - water, Al2O3 - water, CuO - water, Cu - water nanofluids as well as the relationship among mass flow rate, volume fraction of nanoparticles and pressure drop have been analysed. Physical and mathematical models have been built. Using Matlab language programming, the simulation results show that the improvement of heat transfer of concentric - tube gas cooler and COP of transcritical CO2 refrigeration cycle is great. According to different materials, volume fraction of nanoparticles and mass flow rate of nanofluids, the improvement of heat transfer and COP is distinct,

关 键 词：纳米流体 同轴套管气冷器 CO2制冷系统 换热量 COP 

分 类 号：TB611[一般工业技术—制冷工程]