Enhancement on the Performance of Refrigeration System Using the Nano-Refrigerant  

作　　者：Qasim S. Mahdi Maathe A. Theeb and Hisham Saed 

机构地区：[1]Mechanical Engineering Department, Faculty of Engineering, Al-Mustansiriyah University, Baghdad 10001, lraq

出　　处：《Journal of Energy and Power Engineering》2017年第4期237-243,共7页能源与动力工程（美国大卫英文）

摘　　要：The purpose of the present experimental work is to investigate the performance （1 ton） refrigeration system using nano-refrigerant. Nano-refrigerant is alumina （v-A1203） nanopartcal with size （20-30） nm is dispersed into R-134a with volume fraction 0.01% and 0.02%. The experimental test rig consists of horizontal double tube counter flow heat exchanger fabricated of copper. The nano-refrigerant is evaporated inside the inner tube because of the heat gain from hot water passing in the annulus surrounding the inner tube. The experimental results indicate, when increasing the volume concentration of A1203 refrigerant by 0.01% and 0.02%, the heat transfer coefficient increases by 0.54% to 1.1%. The thermal conductivity increases by 11.5% and 14.2%, respectively, while the coefficient of performance increases by 3.33% to 12%, respectively. The heat transfer rate in the refrigeration side is enhancement about 6.7% to 21.4% compared with conventional refrigerant, and the power consumption by compressor is decreased by nearly 1.6% and 3.3%, respectively.

关 键 词：Nano-refrigerant R134A alumina （A1203） tube in tube heat exchanger heat transfer enhancement. 

分 类 号：TK[动力工程及工程热物理]