【作者】 阮芳；

【导师】 李念平；

【作者基本信息】 湖南大学 ， 供热、供燃气、通风及空调工程， 2006， 硕士

【摘要】 本文介绍了地板送风空调系统在国内外的研究现状、存在的问题以及仍需研究的课题,简述了地板送风的原理与特性,并与传统的混合通风方式进行了比较,指出地板送风有独特的通风气流组织、较高的通风效率、布置灵活、能够随意调节实现局部气候环境的个人控制满足个人热舒适性要求以及节能的优点,是一种充分体现以人为本的通风方式,具有广阔的发展前景。基于此,本文采用实验测试、数值模拟和问卷调查三者相结合的方法进行研究。考虑不同点热源(单、双及多点热源)条件下地板送风的系统特性,通过实验研究,分析了不同送风温度,送排风口数量及位置,热源发热量的大小等因素对室内温度分布、羽流流态、热力分层高度、通风效率、热舒适性等的影响。建立了单一热污染源地板送风的数值模拟模型,采用FLUENT软件研究送风温度、送风速度、热源表面温度的变化及有无考虑送风静压层的漏风时,室内温度、速度和污染物浓度分布以及热力分层高度的变化,并与实测分析进行了对比验证。通过问卷调查形式,对顶棚送风、侧送风及地板送风三种送风方式下的人体热感觉、热舒适感及通风换气效果等进行了主观评价,并通过对环境参数的测量,计算反映热环境和热舒适性等的评价指标,结果表明地板送风空调系统具有节能和提高室内空气品质的特点。更多还原

【Abstract】 This thesis introduced the status quo, existent problems and tasks which still need to be studied in the domestic and international research on UFAD (underfloor air distribution system), expounded the principle and characteristic of UFAD. Compared with the traditional mixed ventilation,This thesis pointed out UFAD has advantages of specially ventilated air organize, higher ventilation efficiency, flexible collocation, optionally accommodate to realize local environment in control of individual and satisfy personal request for the thermal comfort, and energy saving, and it is a ventilated way of all for human which has broad development foreground. According to this, this thesis adopts three methods which includes experimental tests, numerical simulation and questionnaire inquiry and combines them together to study UFAD.Carried out experimental research on conditions of different point heat source(single, double and many heat sources), and analyzed the influence of such factors as temperature of air-in, amount and distribution of inlets and outlets, heat emission quantity of heat sources and so on, on distribution of indoor air temperature、shape of plume flow、heat lamination height、ventilation efficiency、thermal comfort and so on. Built up numerical simulation model of UFAD system with single heat and pollutant source, adopted FLUENT software to study distribution of temperature、velocity and contamination’concentration, and changes of heat lamination height when temperature and velocity of air-in and surface temperature of heat source were changed and when the leakage of air-in plenum was considered or not. And compared and verified the simulation results with experimental testing data.Adopted the questionnaire form to do subjective estimation for thermal sensation、thermal comfort、effects of ventilation air change and so on in ceiling air conditioning system, parietal air conditioning system and UFAD. And tested air parameters and calculating estimated indexes that are used to reflect thermal environment and thermal comfort. The results suggested the characteristic of saving energy and improving indoor air quality.更多还原