Convection heat transfer research of supercritical R134a in mini-channel of tube

被引：0

作者：

Zhang Q. ^{[1
]}

Ma Z. ^{[1
]}

Yu Z. ^{[2
]}

Liu Z. ^{[1
]}

Huang B. ^{[1
]}

Yang Z. ^{[1
]}

Ma H. ^{[1
]}

机构：

[1] State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Shaanxi, Xi’an

[2] Qingdao Wobes Intelligent Experiment Technology Co., Ltd., Shandong, Qingdao

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2024年 / 43卷 / 04期

关键词：

fluid flow and heat transfer; heat transfer correlation; micro-channel; organic Rankine cycle; supercritical R134a;

D O I：

10.16085/j.issn.1000-6613.2023-1273

中图分类号：

学科分类号：

摘要：

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. © 2024 Chemical Industry Press Co., Ltd.. All rights reserved.

引用

页码：1667 / 1675

页数：8

共 32 条

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