水平圆管内R245fa高温冷凝传热特性研究

High-Temperature Condensation Heat Transfer Characteristics of R245fa in a Horizontal Plain Tube

高温热泵技术是解决工业减碳的有效方案,R245fa因其热物性较好而被广泛用于高温热泵系统,但目前对其高温工况下的流动冷凝传热特性研究却未见报道。本文实验研究了9 mm水平圆管内R245 fa在干度为0.1~0.9、质量流速为218~393 kg·m^(-2)·s^(-1)、饱和温度为80~100°、热流密度为11300~22500 W·m^(-2)下的冷凝传热特性。在实验数据与传热关联式对比基础上,对现有关联式进行修正,修正后的关联式对实验数据的平均预测偏差为6.11%,预测精度显著提高。

High-temperature heat pump is recognized as an effective solution for industrial decarbonization.R245fa has widely employed in high-temperature heat pump systems for its favorable thermal properties.Nevertheless,there is currently a dearth of reported research on the condensation heat transfer characteristics of R245fa under high-temperature conditions.This study experimentally investigated the condensation heat transfer characteristics of R245fa within a 9 mm horizontal circular tube at vapor quality range of 0.1∼0.9,mass flux range of 218∼393 kg·m^(−2)·s^(−1),saturation temperature range of 80∼100°C,and heat flux range of 11300∼22500 W·m^(−2).Based on a comparison between experimental data and existing heat transfer correlations,modifications are made to the existing correlations.The revised correlations exhibited a mean prediction deviation of 6.11%,signifying a significant improvement in prediction accuracy.