供冷参数对复合空调室内热湿环境的影响分析  

Effect of cooling parameters on the indoor thermal environment of rooms with hybrid system of chilled ceiling panel and displacement ventilation

作　　者：赵蕾[1] 张佩东[1] 袁锋 杨柳[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院 [2]郑州市建筑设计院,河南郑州450052

出　　处：《西安建筑科技大学学报（自然科学版）》2008年第2期254-259,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50408014);陕西省教育厅专项科研计划项目(05JK252);中国教育部留学回国人员科研启动基金项目(教外司留[2007]1108)

摘　　要：供冷参数的不同组合会导致置换通风与辐射冷板复合空调室内热湿环境及系统运行费用的不同.因此,选取合适的送风和冷板组合供冷参数对复合空调系统的设计是十分重要的.针对采用复合空调系统的办公室的室内温、湿度及速度场进行了CFD仿真,揭示了送风温度、相对湿度及速度、冷板表面温度及冷板与天花板面积比等参数变化对室内热湿环境及流场分布的影响规律;给出了通风系统与冷顶板供冷量随各参数的变化情况.按正交试验设计法安排了5因素5水平模拟试验方案,进行了数值模拟,并分析了各供冷参数与热舒适性指标PMV的相关性,提出了使室内热环境和通风效率最佳的组合供冷参数.Choosing proper combined cooling parameters is an important step in designing hybrid air-conditioning systems of chilled ceiling panel and displacement ventilation. Different combination may bring about different indoor thermal comfort as well as different operational cost. To this end, CFD simulations were conducted in an office with a hybridd system to reveal the influence of different combination of cooling parameters. Firstly, the individual influence of such cooling parameters as supply air flow rate,temperature and relative humidity of DV, the surface temperature and the area ratio of CP to the ceiling on indoor air temperature, relative humidity and velocity distribution were studied. It shows that larger air supply flow rate leads to lower temperature in occupied zone and there is a decrease in the ration of the cooling capacity of the chilled ceiling panel to that of the DV. As supply air temperature of the DV rises, vertical temperature gradient it creates in the occupied zone will decrease. While the cooling capacity of CP decreases ,somewhat, ventilation efficiency also improves. It is also found that the temperature gradient in the occupied zone drops as the surface temperature of the CP drops scarifying ventilation efficiency. The enlargement of the area of CP brings about the drop of air temperature in the upper part of the room. The optimal combined cooling parameters were proposed by conducting 5 factors, 5 levels simulation experiments. Under the optimal condition, the PMV value reaches zero with 5% PPD and ventilation efficiency obtain relatively high value. Results indicate that supply air can be sent into the room at dew point if relative lower supply air temperature is adopted.

关 键 词：复合空调系统 辐射供冷 置换通风 热舒适 通风效率 

分 类 号：TU834.3[建筑科学—供热、供燃气、通风及空调工程]