制冷剂R-134a在螺旋环形通道内凝结换热的实验研究

制冷剂R-134a在螺旋管内的凝结换热和压力降特性数据对于制冷空调和热泵等系统的设计改造及运行都具有重要的理论意义和工程应用价值。本文对R-134a在螺旋环形通道内的凝结换热和压力降特性进行了实验研究．得到了平均的凝结换热系数和压力降特性的实验数据，并与文献报导的R-134a在直管和螺旋管内凝结换热的实验结果进行了比较，所得实验数据可望为新型螺旋管换热器的开发设计和工程应用提供参考数据。

Experimental Investigation of the Condensation Heat Exchange of Replacement Refrigerant R-134a in a Spiral Ring-shaped Channel

The role played by refrigerant R-134a in the condensation heat exchange in spiral tubes and its pressure-drop characteristics data are of major theoretical significance and have a high practical value in engineering applications so far as the design modification and operation of such systems as refrigeration air conditioning units and heat pumps, etc. are concerned. The authors have carried out an experimental study regarding the condensation heat exchange and pressure-drop characteristics of the refrigerant R-134a in a spiral ring-shaped channel. As a result, experimental data, such as average condensation heat exchange factor and pressure-drop characteristics were obtained, which were compared with the test results of R-134a as reported in available literature concerning its condensation heat exchange in straight pipes and spiral pipes. The experimental data thus obtained can serve as a reference during the development, design and application of new types of spiral tube heat exchangers.