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The heat exchangers tubes mineral type effect on the refrigeration system performance using different lengths of the capillary tube
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science ( IF 2 ) Pub Date : 2021-04-14 , DOI: 10.1177/09544062211002231
Thamer Khalif Salem 1 , Saad Sami Farhan 1 , Raaid Rashad Jassem Al Doury 1 , Israa Sami Farhan 1
Affiliation  

An experimental study is conducted to show the influence of the tubes material type of the heat exchanger on the refrigeration system performance. The system is operated by using R134a as a working fluid, 2 mm internal diameter, and different lengths of capillary tubes which were 120, 135, and 150 cm. The experimental results showed that when increasing the refrigerant mass flowrates led to reducing each of the performance coefficient COP, number of transfer unit NTU and evaporator effectiveness ε. However, the highest improvement had appeared for each parameter COP, NTU, and ε which were 21%, 113.38%, and 59.42% respectively at a capillary tube length of 120 cm and m˙ = 3.19 g/s compared to the length of capillary tube 150 cm. Besides, it was found an increase in W˙c with the incrementing in the capillary tube length from 120 cm to 150 cm. The biggest percentage of compression power was 23% at the capillary tube length of 150 cm compared to others at m˙ = 3.71 g/s. Finally, the experimental results of COP and W˙c were validated by comparing them with other publications.



中文翻译:

换热管矿物类型对毛细管长度不同的制冷系统性能的影响

进行实验研究以显示热交换器的管材料类型对制冷系统性能的影响。通过使用R134a作为工作流体,2 mm的内径和120、135和150 cm的不同长度的毛细管来操作该系统。实验结果表明,当增加制冷剂质量流量时,会导致性能系数COP,传输单元NTU的数量和蒸发器效率ε均降低。但是,在毛细管长度为120 cm和30 cm时,每个参数COPNTU和ε的改善最大,分别为21%,113.38%和59.42%。˙ 与毛细管150 cm的长度相比,= 3.19 g / s。此外,发现增加w ^˙C毛细管长度从120 cm增加到150 cm。在毛细管长度为150 cm时,最大压缩力百分比为23%,而在150 cm处,压缩力百分比为其他百分比。˙ = 3.71g / s。最后,COP的实验结果和w ^˙C 通过将它们与其他出版物进行比较来进行验证。

更新日期:2021-04-15
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