近露点冷辐射板内封闭水平空气夹层耦合换热优化及实验研究

At present, the development of radiant cooling technology meets two key barriers: surface condensation and insufficient cooling capacity of the radiant cooling panel. Although the researchers have tried to propose a number of solutions, the relevant efforts have not obtained satisfactory results. In order to solve the above problems, a near dew point radiant cooling panel which has been applied in several air conditioning projects will be further studied. In this research, we try to establish a new physical model and optimization method of heat transfer process for this type of radiant panel, to analyze and optimize the coupled heat transfer process and get the optimal design scheme of the heat exchange parts. The specific research content includes three aspects: (1) establish a new coupled heat transfer model for near dew point radiant cooling panel; (2) analyze the coupled heat transfer process of the radiant cooling panel, based on the new model; (3) optimize the heat transfer components of the near dew point radiant cooling panel by combining the factor screening, variance analysis, experimental design and mathematical statistics methods, and to obtain the optimal design scheme. Successful project could solve the two key barriers that hinder the application of radiant cooling technology, and contribute to the development of building energy saving technology in China.

当前辐射供冷技术面临辐射板面易结露和供冷能力不足的关键难题。虽然研究者们提出了众多方案试图予以解决，但相关努力仍未获得满意结果。为解决以上问题，本课题力求建立新的换热机理模型与优化方法，对近露点冷辐射板(前期已获较好工程应用)内部耦合换热过程进行分析与优化，得到换热部件的最优化设计方案。具体研究内容涵括三个方面：(1)建立近露点冷辐射板新的耦合换热模型；(2)基于新的模型，对辐射板内耦合换热过程进行分析；(3)以分析结果为基础，将因素筛选、方差分析、试验设计以及数理统计等方法结合，对近露点冷辐射板传热部件进行优化，并得出其最优化设计方案。如成功，能一举解决阻碍辐射供冷技术推广应用的两个关键难题，为我国建筑节能技术的发展做出贡献。

本项目已完成对“近露点冷辐射板”板内及其与室内换热过程的物理模型构建，并利用VC++语言编制了完整的模拟程序。利用该模拟程序可以计算出板内肋片上的温度场、空腔内空气温度、板面平均温度、与室内的辐射和对流换热量等热工参数，并能计算出该型冷辐射板在不结露前提下的极限换热量。这些模拟数据将为辐射供冷空调系统的优化运行提供理论依据。而环境舱试验台的建设是为了给模型修正提供必要的实验验证数据。虽然疫情影响了试验台建设进度，项目团队已经利用模拟程序与初步建成的试验台取得较好的研究数据积累，确信在近一两年内定会有较高水平的学术论文发表。项目的执行还带动了相关方向的研究工作，团队成员已发表多篇国内期刊学术论文，项目负责人指导2018级本科生取得国家级大学生创新创业课题立项。