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Performance enhancement of a vapor compression refrigeration system using R134a/MWCNT-oil mixture and liquid-suction heat exchanger equipped with twisted tape turbulator
International Journal of Refrigeration ( IF 3.5 ) Pub Date : 2020-09-10 , DOI: 10.1016/j.ijrefrig.2020.09.009
Mohamed R. Salem

This study investigates the performance attributes of a vapor compression refrigeration system (VCRS) with employing R134a/MWCNT-oil mixture and liquid-suction heat exchanger (LSHE) with/without twisted tape turbulator (TTT). The tests are done at different cycle pressure ratios (6.55–10.12), TTT twist ratios (1 ≤ λ ≤ 4), and nanoparticles’ mass concentrations (0 ≤ φ ≤ 0.5%). The experiments state that the exergy destruction rates are reduced by employing LSHE, TTT with reducing its twist ratio, and engaging R134a/MWCNT-oil mixture with increasing the MWCNTs loading, besides growing the cycle pressure ratio. Compared to the simple VCRS, the maximum enhancements in the COP and exergy efficiency (ηEx) of the VCRS are 37.3% and 126.5%, respectively, while compared to the simple LSHE, its effectiveness is improved by 97.9% obtained by simultaneously applying LSHE with TTT of λ = 1 and R134a/MWCNT-oil mixture of φ = 0.5%. Correlations are supplied to predict the COP and ηEx of the VCRS besides the effectiveness of LSHE.



中文翻译:

使用R134a / MWCNT油混合物和配备扭曲带扰流器的吸液热交换器提高蒸汽压缩制冷系统的性能

这项研究调查了蒸汽压缩制冷系统(VCRS)的性能属性,该系统采用R134a / MWCNT油混合物和带/不带扭带式扰流器(TTT)的液体吸入热交换器(LSHE)。测试在不同的循环压力比(6.55-10.12),TTT捻比(1≤完成 λ  ≤4),和纳米颗粒质量浓度(0≤φ≤0.5%)。实验表明,通过使用LSHE,TTT降低其扭曲率,并通过增加MWCNTs的负荷与R134a / MWCNT-油混合物接合,除了增加循环压力比之外,还降低了本能破坏率。相比于简单的VCRS,在COP和火用效率的最大增强(η)的VCRS分别为37.3%和126.5%,而与简单的LSHE相比,通过同时使用λ  = 1的TTT和φ= 0.5%的R134a / MWCNT油混合物获得的LSHE,其有效性提高了97.9 % 。相关性被提供给预测COP和η实施例的VCRS的除了LSHE的有效性。

更新日期:2020-10-14
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