Experimental investigation on boiling heat transfer characteristics of R1234yf/R1336mzz(Z) in horizontal flow

Mengtao Liu, Li Guo, Wei Li, Weicong Xu, Li Zhao
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Abstract

Due to the inclusion of 18 HFCs, including R134a and R245fa, in the Kigali Amendment as controlled working fluids, the search for excellent alternatives to R134a and R245fa is urgent. R1234yf and R1336mzz(Z) are potential alternative working fluids to R134a and R245fa, but most studies have focused on the comparison of thermodynamic performance and boiling heat transfer capability of these pure working fluids. There is limited research on the boiling heat transfer performance of their mixed working fluids. Therefore, this study focuses on the flow boiling heat transfer characteristics of the mixed working fluid R134a/R245fa under non-azeotropic conditions. Experimental methods were employed to investigate the boiling heat transfer performance of the alternative working fluids R1234yf/R1336mzz(Z) (including R245fa/R1234yf and R1234yf/R1336mzz(Z) mixed working fluids) and evaluate the feasibility of R1234yf and R1336mzz(Z) as substitutes for R134a and R245fa. The results indicate that among the three mixed refrigerants, R134a/R245fa exhibits the highest heat transfer coefficient, while R1234yf/R1336mzz(Z) shows the lowest heat transfer coefficient. However, the differences in heat transfer coefficients among these three are relatively small, and their overall trends under different operating conditions are similar. It is evident that R134a/R245fa, with its good thermodynamic performance and stability, still holds potential as a transitional working fluid. R1234yf/R1336mzz(Z), with similar physical and thermodynamic properties, is an excellent alternative to R134a/R245fa.

水平流动中 R1234yf/R1336mzz(Z) 沸腾传热特性的实验研究
由于《基加利修正案》将包括 R134a 和 R245fa 在内的 18 种氢氟碳化物列为受控工作流体,因此迫切需要寻找 R134a 和 R245fa 的优秀替代品。R1234yf 和 R1336mzz(Z) 是 R134a 和 R245fa 的潜在替代工作流体,但大多数研究都集中在这些纯工作流体的热力学性能和沸腾传热能力的比较上。对这两种混合工作流体的沸腾传热性能的研究十分有限。因此,本研究重点关注 R134a/R245fa 混合工作液在非各向同性条件下的流动沸腾传热特性。采用实验方法研究了替代工作流体 R1234yf/R1336mzz(Z)(包括 R245fa/R1234yf 和 R1234yf/R1336mzz(Z) 混合工作流体)的沸腾传热性能,并评估了 R1234yf 和 R1336mzz(Z) 作为 R134a 和 R245fa 替代品的可行性。结果表明,在三种混合制冷剂中,R134a/R245fa 的传热系数最高,而 R1234yf/R1336mzz(Z) 的传热系数最低。不过,三者之间的传热系数差异相对较小,而且在不同工作条件下的总体趋势相似。由此可见,R134a/R245fa 具有良好的热力学性能和稳定性,仍然具有作为过渡性工作流体的潜力。R1234yf/R1336mzz(Z) 具有相似的物理和热力学特性,是 R134a/R245fa 的理想替代品。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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