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Thermal properties and heat transfer characteristics of ternary alternative refrigerant mixtures for HCFC22.

HCFC22三元替代制冷剂混合物的热性能和传热特性。

基本信息

批准号：
06452182
负责人：
SAITO Takamoto
金额：
$ 4.74万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452182/
关键词：
Alternative refrigerants HCFC22 Heat exchangers Equation of states Evaporation Condensation Mixed refrigerants 蒸気圧

项目摘要

The purpose of this study is to clarify the thermal properties and heat transfer characteristics of ternary mixture of HFC 32/125/134a, which is assumed a promising alternative refrigerant for HCFC22.1. In order to determine the binary interaction parameters in the Peng-Robinson equation of states, vapor pressure of the mixtures and composition in vapor were measured using a strain gauge type of pressure transducer and a gas chromatography, respectively. The temperature ranged from-10 to 50 degrees. Accuracy of the pressure measurement was checked by comparing measured and published saturation pressures of HFC134a, and was within 0.25%. Based on the obtained data, the binary interaction parameters in the Peng-Robinson equation of states were determined, and a program code for the ternary mixtures was developed.2. Evaporation and condensation heat transfer coefficients of various kinds of refrigerant including HFC32, HFC125, HFC134a, HFC32/134a and HFC32/125/134a, were measured inside a horizontal smooth tube. Effects of heat flux, mass flux, quality and temperature glide of the mixture on the heat transfer characteristics were examined. Evaporating and condensing temperature were 20 and 40 degrees, respectively. The heat transfer coefficients of mixtures were about, 30% lower than the single component fluids with similar thermopysical properties to the mixtures. A predictive model of evaporation heat transfer for HFC32/125/134a was presented. It was concluded that the principal mechanism of heat transfer degradation of the ternary mixtures was the same with the binary mixtures.

本文研究了HFC 32/125/134 a三元混合工质的热物性和传热特性。为了确定Peng-Robinson状态方程中的二元相互作用参数，分别使用应变片式压力传感器和气相色谱仪测量了混合物的蒸气压和蒸气中的组成。气温在零下10度到50度之间。通过比较HFC-134 a的实测饱和压力和公布的饱和压力，检查了压力测量的准确性，结果在0.25%以内。基于所得数据，确定了Peng-Robinson状态方程中的二元相互作用参数，并编制了三元混合物的计算程序.在水平光管内对HFC 32、HFC 125、HFC 134 a、HFC 32/134 a和HFC 32/125/134 a等6种制冷剂的蒸发和冷凝换热系数进行了测量。考察了混合物的热通量、质量通量、质量和温度滑动对传热特性的影响。蒸发温度和冷凝温度分别为20度和40度。混合物的传热系数比具有相似热物理性质的单组分流体低约30%。建立了HFC 32/125/134 a的蒸发传热预测模型。结果表明，三元混合物传热性能劣化的主要机理与二元混合物相同。