化工进展2024，Vol.43Issue(4)：1667-1675,9.DOI:10.16085/j.issn.1000-6613.2023-1273
微小通道内超临界R134a流动传热特性
Convection heat transfer research of supercritical R134a in mini-channel of tube
摘要
Abstract
The supercritical organic Rankine cycle(SORC)is an ideal new power cycle technology for recovering energy using supercritical organic Rankine cycle.The energy efficiency of the system is significantly affected by the SORC,the supercritical organic working medium,low grade energy recovery,and the heat transfer characteristics of the supercritical organic working medium.At present,it has become a bottleneck that restrict the development of organic Rankine cycle technology.To address this issue,the experimental studies were conducted on the flow heat transfer characteristics of supercritical R134a in a tiny channel with an inner diameter of 2mm).The parameters considered in the study were as follows:heat flux ranging from 60-120kW/(m2·s),mass flow rate from 800-3000kg/(m2·s),pressure from 4.1-5.1MPa,and working medium inlet temperature from 20-100℃.The effects of heat flow density,mass flow velocity,pressure and fluid temperature on the heat transfer characteristics were discussed.The results showed that the heat transfer coefficient initially increased and then decreased with the increase of fluid temperature.It also increased with the increase of mass flow rate but decreased with the increase of heat flux and pressure.According to the experimental data,a prediction accuracy of±10％for R134a in the microchannel was achieved,demonstrating good prediction accuracy.关键词
微小通道/超临界R134a/流动传热/有机朗肯循环/传热关联式Key words
micro-channel/supercritical R134a/fluid flow and heat transfer/organic Rankine cycle/heat transfer correlation分类
能源科技引用本文复制引用
张巧玲,马祖浩,于子元,刘梓俊,黄铋匀,杨振东,马浩然..微小通道内超临界R134a流动传热特性[J].化工进展,2024,43(4):1667-1675,9.基金项目
国家自然科学基金(52376149) （52376149）
陕西省教育厅重点科学研究计划(20JY044). （20JY044）
