当前位置: X-MOL 学术Sci. Tech. Built Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
In-Tube condensation of zeotropic refrigerant R454C from superheated vapor to subcooled liquid
Science and Technology for the Built Environment ( IF 1.9 ) Pub Date : 2020-08-18 , DOI: 10.1080/23744731.2020.1804281
Tabeel A. Jacob 1 , Brian M. Fronk 1
Affiliation  

This article investigates the in-tube, superheated, saturated, and subcooled condensation of zeotropic refrigerant mixture R454C. R454C is proposed to replace R404A for commercial refrigeration applications. Quasi-local heat transfer coefficients were measured in a 4.7 mm horizontal tube at mass fluxes ranging from 100 to 500 kg m−2 s−1 at three different saturation conditions (40, 50, and 50 °C). The resulting data was compared with the non-equilibrium condensation models of Agarwal and Hrnjak, Kondou and Hrnjak, and Xiao and Hrnjak, as well as the equilibrium model of Cavallini et al. with the Gnielinski correlation for predictions in subcooled and superheated regions. The additional mass transfer effects were accounted for by applying the Silver, Bell and Ghaly mixture correction. The non-equilibrium Kondou and Hrnjak model, with the predictions in the subcooled region from Gnielinski correlation, agrees best with the data (mean average percent error = 9%). An air-cooled condenser for a 1055 kW refrigeration system is designed by following both the non-equilibrium and equilibrium approaches. This non-equilibrium approach leads to a 4.8 and 9.1% reduction in heat transfer area for R454C and R404A, respectively. R454C condenser area is 17–21% larger than that of a R404A condenser.



中文翻译:

共沸制冷剂R454C从过热蒸汽到过冷液体的管内冷凝

本文研究了共沸制冷剂混合物R454C的管内,过热,饱和和过冷冷凝。建议使用R454C代替R404A,用于商业制冷应用。在4.7 mm水平管中以100至500 kg m -2 s -1的质量通量测量准局部传热系数在三种不同的饱和条件下(40、50和50°C)。将所得数据与Agarwal和Hrnjak,Kondou和Hrnjak,Xiao和Hrnjak的非平衡缩合模型以及Cavallini等人的平衡模型进行了比较。与Gnielinski相关性进行过冷和过热区域的预测。通过应用Silver,Bell和Ghaly混合物校正可以解决额外的传质效果。非平衡的Kondou和Hrnjak模型,以及根据格涅林斯基相关性在过冷区域进行的预测,与数据最吻合(平均平均误差= 9%)。通过遵循非平衡和平衡方法,设计了用于1055 kW制冷系统的风冷冷凝器。这种非平衡方法导致4.8和9。R454C和R404A的传热面积分别减少1%。R454C冷凝器面积比R404A冷凝器大17-21%。

更新日期:2020-09-03
down
wechat
bug