Frost-Resistance Performance and Feasibility Study of Side Louvers in Direct Air-Cooling Island

YU Longwen; HUANG Hancheng; FAN Ye; DU Xiannan; JIA Dawei; LIU Jishan; JING Xinjing; YANG Jing; SHI Jinwen

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Frost-Resistance Performance and Feasibility Study of Side Louvers in Direct Air-Cooling Island

更新时间：2026-06-16

- Frost-Resistance Performance and Feasibility Study of Side Louvers in Direct Air-Cooling Island
- JOURNAL OF XI’AN JIAOTONG UNIVERSITY (2026)
- 作者机构：
  
  1.西安热工研究院有限公司，710054，陕西西安
  2.西安交通大学动力工程多相流国家重点实验室，710049，陕西西安
  3.内蒙古和林发电有限责任公司，011500，内蒙古自治区呼和浩特市
  4.高效灵活煤电及碳捕集利用封存全国重点实验室，710054陕西西安
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK121
- Received：28 February 2026，
  
  Revised：2026-04-08，
  
  Accepted：16 April 2026，
- 稿件说明：
移动端阅览
YU Longwen, HUANG Hancheng, FAN Ye, et al. Frost-Resistance Performance and Feasibility Study of Side Louvers in Direct Air-Cooling Island[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2026.
DOI：

YU Longwen, HUANG Hancheng, FAN Ye, et al. Frost-Resistance Performance and Feasibility Study of Side Louvers in Direct Air-Cooling Island[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2026. DOI：

摘要

为了解决直接空冷岛在冬季低温、低负荷条件下易发生管束冻结和换热不均等问题，增强直接空冷岛在严寒环境下的运行可靠性，本文提出一种安装于空冷岛侧部换热管束平面的可调式百叶窗结构，通过调节叶片开度主动控制进入管束的空气流量，以适应不同季节与工况的散热需求。基于空冷岛整体几何模型与局部单个空冷单元模型，使用Fluent对百叶窗在不同开启角度下的流动与换热性能进行数值分析，系统研究百叶窗调节对冬季防冻效果以及对常规工况下换热能力的影响。结果表明：在-20 ℃、20 m/s环境风的极端冬季工况下，关闭百叶窗可使直接空冷岛换热量减少83.6 %，有效降低管束外表面对流换热强度，显著抑制冻结风险，使空冷岛在严寒环境下保持更安全的运行状态；在29 ℃、4 m/s环境风的常规工况下，调整百叶窗叶片角度为60 °可使得空冷单元换热量损失仅为1.8 %，对系统正常散热性能影响极小。该百叶窗结构便于运行调控、适用性强，能够为寒冷地区直接空冷岛的冬季防冻运行提供一种灵活有效的技术方案。

Abstract

To solve the problems of tube bundle freezing and uneven heat transfer in a direct air-cooling island under winter low-temperature and low-load conditions and to improve its operational reliability in severe cold environments

an adjustable louver structure installed on the side heat exchange plane of the air-cooling island is proposed. By adjusting the blade angle

the airflow entering the tube bundles can be actively controlled to meet the heat dissipation requirements under different seasons and operating conditions. Based on the overall geometric model of the air-cooling island and a local single air-cooled unit model

numerical simulations were carried out using Fluent to analyze the flow and heat transfer performance of the louvers at different opening angles

and the effects of louver regulation on winter anti-freezing performance and heat transfer capacity under conventional conditions were systematically investigated.The results show that under an extreme winter condition with an ambient temperature of −20 ℃ and a wind speed of 20 m/s

closing the louvers reduces the total heat transfer capacity of the direct air-cooling island by 83.6 %

effectively decreasing the convective heat transfer intensity on the outer surface of the tube bundles and significantly suppressing freezing risk

thereby maintaining safer operation in severe cold environments. Under a conventional condition with an ambient temperature of 29 ℃ and a wind speed of 4 m/s

adjusting the blade angle to 60 ° limits the heat transfer loss of a single air-cooled unit to 1.8 %

with only a minor influence on the normal heat dissipation performance of the system. The proposed louver structure is easy to regulate in operation and highly adaptable

providing a flexible and effective technical solution for winter anti-freezing operation of direct air-cooling islands in cold regions.

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