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《建筑热能通风空调》2016,(12)
脉动送风是一种"准自然风"的气流组织。通过实验研究了一种能够产生周期性脉动气流的风口以及该气流组织速度场的分布,并给出了主体段轴心平均速度分布公式。对脉动送风气流组织效果进行了指标评价。研究表明脉动风口的气流是一种通风效率较高,工作区人员热舒适性较好的气流组织形式。 相似文献
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地板送风房间的气流组织与热舒适性 总被引:1,自引:0,他引:1
综合考虑地板送风参数及其室内气流组织及舒适性的影响,采用CFD技术对地板送风房间的气流组织进行数值模拟,并用空气分布特性指标(ADPI)对模拟结果进行评价,为地板送风可以使房间达到良好稳定的气流组织及舒适性提供了有效根据。 相似文献
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《建筑热能通风空调》2017,(5)
为研究孔板送风方式对壁挂式空调房间热舒适性的影响,采用Airpak软件分别对在相同送风量和送风温度下采用传统射流送风和孔板送风的气流组织进行数值模拟,通过对温度场、速度场、PMV-PPD值的对比分析,评价两种送风方式下的室内热舒适性,并采用实验测试的方法,对模拟结果的准确性进行实验验证。结果表明:送风方式对室内热舒适性影响明显,孔板送风对室内气流组织的改进和热舒适性的提高有较显著效果,夏季工况采用孔板送风可以起到节省能耗的作用。 相似文献
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针对现有数据机房热环境评价指标不足,将热学原理■损失方法应用于机房热环境评价。以某典型数据中心机房为例,建立了风管上送风、地板下送风和机柜前送风后回风3种气流组织模型,将热学原理■损失评价结果与数值模拟结果进行了对比,验证了该方法的合理性。以地板下送风为例,运用■损失方法,评估了封闭冷/热通道优化方式对数据机房热环境的影响程度。与其他指标评价方法相比,■损失评价方法不仅可以有效评价数据机房气流组织形式,还可以量化系统传热过程中冷热气流掺混造成的热损失,可以更加全面地评价机房热环境。 相似文献
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针对当前部分教学楼教室无法满足人体热舒适要求和教室内人员分布较为密集,若存在感染者其感染风险未知等问题,采用计算流体力学软件(CFD)模拟了不同工况的送风参数下(改变送风速度、送风角度)教室内的气流组织及热舒适性,应用熵权法对热舒适指标PMV和吹风不满意率DR进行赋权,应用多目标优化TOPSIS法对不同工况进行排序,得出在送风温度为18℃下的最佳送风参数组合为:送风速度为1 m/s,送风角度为60°。该工况下工作区热舒适指标PMV和吹风不满意率DR平均值为0.827和0.326,并针对此工况运用改进的感染风险模型进行感染风险预测,发现感染者呼出的飞沫大部分聚集在教室左侧区域,故此区域内感染风险较高。 相似文献
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采用数值模拟方法,对一应用地板送风系统的开敞式办公环境的气流组织进行模拟计算。通过对模拟结果的速度场和温度场的分析,表明了地板送风能够提供具有较好热舒适性的室内环境。 相似文献
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低温送风空调系统设计浅析 总被引:1,自引:0,他引:1
刘华斌 《建筑热能通风空调》2005,24(6):40-44
低温送风空调系统与常规空调系统有较大的差异,了解低温送风系统独有的特点,是正确设计低温送风系统所必需的。文中分析了低温送风系统所需的冷源、气流组织、末端风口、控制策略等方而的特点和设计措施。 相似文献
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介绍了山西大剧院的空调系统,并以主剧场为例着重阐述了观众厅座椅送风方案,通过对置换通风和空调系统下送风的方式进行分析,总结了该工程观众厅气流组织的设计和计算方法,对同类工程具有借鉴作用。 相似文献
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以广州某剧院为例,发现剧院座椅下送风在不同冷负荷率下送风温差存在优化空间。采用CFD模拟软件,通过正交实验的方法对剧院座椅下送风冷负荷率在100%、75%、50%时的不同送风温差进行计算分析。通过对比温度场和速度场,探究剧院座椅下送风不同冷负荷率与送风温差的关系。得到剧院座椅下送风在100%、75%冷负荷率的最优送风温差为3℃,在50%冷负荷率的最优送风温差为2℃。 相似文献
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Full-scale burning tests were conducted in a full-scale underground long corridor with beamed ceiling and smooth ceiling. The influence of air-supply opening position on the smoke exhaust efficiency was studied. The operation time of the smoke exhaust fan was also discussed to obtain a better smoke exhaust. Results showed that the smoke exhaust would be more efficient when air-supply openings were some distance away from the smoke exhaust openings. When the air-supply opening was near the smoke exhaust opening, even with larger smoke exhaust rate, it still gave poor smoke control results. Two comparing tests on the effects of operation time indicated that it would give poor smoke control ability when the smoke exhaust system operated too early. Finally, some future research topics were also discussed in this paper. 相似文献
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被动式建筑具有密闭性良好、减少能量损失的优势,在我国农村地区应用具有重要的节能意义。由于围护结构密闭性较高,被动式农村住宅通风换气技术对提高和保障室内空气品质和环境热舒适性尤为重要。针对沈阳某高校示范建筑,分析通风换气技术对其室内环境热舒适性影响,应用Airpak软件进行数值解算,给出室内温度场、速度场和PMV、PPD指标的分布状况。分析不同送风温度、送风风速工况条件下的室内空气温度分布情况,以及PMV、PPD指标对室内环境热舒适性的影响,确定满足环境热舒适性要求的送风工况,为农村被动式住宅的通风换气技术应用提供基础依据。 相似文献
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应用计算流体力学方法对夏季空调房间两种送风参数下的室内气流组织进行了数值模拟,给出了速度场和温度场的分布状况,通过对比分析,指出舒适性空调夏季采用较低的送风速度能使室内温度场和速度场分布更均匀。 相似文献
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This report presents the results of investigations on the indoor air quality of common Japanese detached houses. It is necessary to control the emission rates from the interior materials and the ventilation rates to keep indoor concentration of VOC enough low. And it is also necessary to consider the influence of the pollution sources in the concealed spaces for better indoor air quality in some kinds of building structures and some kinds of ventilation systems. In this study the influences of the concealed pollution sources upon the indoor concentrations of pollutants were investigated using three detached houses with four ventilation systems and the following results were obtained. When the ventilation system was changed from the air-supply type to the air-exhaust type, the indoor concentrations of formaldehyde increased. The infiltration ratios: the ratios of the infiltration rate to the indoor space toward the emission rate of a pollutant in the concealed space were measured using the tracer-gas method. The ratios from the beam spaces and the partition were about 100% in most cases. The ratios from the crawl space under the first floor and the truss space under the roof were lower than those from the beam space and partitions in most cases, because those spaces have ventilation openings. But the ratio from the crawl space reached about 100% in the house without ventilation openings at the crawl space. And even in the house with ventilation openings at crawl space, the ratio reached 50% in the house with the exhaust-ventilation system. Therefore, it became clear that the use of the medicine to prevent the deterioration of the wooden structure and the white ants in the crawl spaces must be limited. The ratio from the envelope wall was changed with the pressure difference between inside and outside. These results showed that it is necessary to prevent infiltration from the concealed spaces and to control the emission rate from the concealed pollution sources. 相似文献