疏水性辐射供冷末端结露特性及建筑渗风作用下调控方法研究

辐射供冷末端是一种新兴的空调末端方式，在改善舒适性、节省输送能耗等方面具有显著优势，如何有效避免结露风险是其推广应用的重要基础问题。本项目即是针对疏水性辐射末端结露特性及其在建筑渗风作用下调控方法开展的研究，具体包括：1）疏水性辐射末端结露特性研究，实验测试和理论分析疏水性辐射末端表面结露过程，揭示疏水材料表面的露珠形成、聚合及脱落规律，得到表面冷凝速率、凝露的脱落时间和脱落粒径特征；2）热湿渗风的流动扩散规律研究，实际测试与模拟分析室外热湿空气进入室内的流动路径，阐明渗风侵入位置、室内外温湿度差等因素的影响，定量刻画典型室内外参数下的渗风作用范围，优化设计辐射末端的敷设位置；3）辐射供冷系统应对热湿渗风的调控方法研究，分析实际环境中室内热湿扰动下疏水性辐射末端表面结露及再蒸发的动态过程，评估结露风险及可行的应对措施，构建疏水性辐射末端和除湿系统防结露的联合调控方法。

Radiant cooling is a novel air-conditioning system and has gained appreciable interest and success due to its thermal comfort and energy efficiency. The condensation risks of radiant cooling systems when applied in a hot and humid climate becomes the main obstacle for their applications in new buildings and renovations. Research on condensation characteristics of the radiant cooling system with hydrophobic treatment and control strategy dealing with air infiltration in buildings will be investigated in this project, which mainly includes three aspects as follows: (1) Theoretical and experimental analysis on the condensation characteristics of hydrophobic radiant cooling. The characteristics of dew formation, coalescence, and fall-off on hydrophobic and superhydrophobic surfaces will be clarified. The condensation rate, departure duration of condensate droplet, and size of falling droplets of the hydrophobic radiant cooling will be explored. (2) Analysis on flow pattern and indoor influencing area of air infiltration in buildings. Through onsite measurement and simulation of typical large space buildings and offices, the influencing area of air infiltration is investigated in order to optimize radiant cooling design for eliminating condensation risks, taking the air infiltration inlet position and indoor and outdoor temperature and humidity difference into account. (3) Analysis on control strategy dealing with air infiltration induced condensation. Theoretical model of condensation and evaporation dynamic process on the hydrophobic radiant cooling surface will be developed to evaluate condensation risks. A conjunctive control strategy of hydrophobic radiant cooling and air dehumidification system is proposed for preventing condensation risks and optimizing performance of an actual radiant cooling.