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通过CFD模拟研究了碰撞射流系统末端不同送风形式,对各送风形式下室内的速度场和温度场的分析结果表明:典型工况条件下,在送风末端管壁处设置小开口以及百叶会使近地面扩散气流速度明显降低,可以降低冬季工况室内人员产生冷风感的风险。所有送风口形式均有下部空间温度高于上部特征,可实现较高的送风能量利用效率。 相似文献
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本文目的是研究方形散流器的送风参数对室内气流分布的影响规律。在模拟建筑内区的空调实验室进行了实验,测出了不同送风参数下室内所有测点的温度和速度。对实验数据分析得出空气分布特性指标、温度不均匀系数以及速度不均匀系数与送风速度的关系曲线,并用TECPLOT软件实现了温度场、速度场的可视化。结果表明在室内热源和控制温度不变时,随着送风速度的增大,送风温度升高,送风温差减小,室内工作区的空气分布特性指标增大。 相似文献
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天桥剧场观众厅池座椅背送风方案研究 总被引:4,自引:0,他引:4
由于下送风方案可以减小能耗,降低噪音,天桥剧场观众厅池座拟采用下送风方案。本文对天桥剧场观众厅池座部分采用椅背送风时的效果进行了模拟计算,计算工况包括不同的送风温度和不同的诱导比。数值计算结果表明,采用椅背送风,观众身体周围的风发布合理,头部,躯干和大腿处的温度合理,下会对观众造成吹风感或闷热的感觉,当诱导比增大时,送风气流作用的范围增大,人体周围的温度场更加均匀,当送风温差减少时,人体周围的温度 相似文献
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变风量空调系统的新风问题 总被引:3,自引:2,他引:1
以某写字楼为例,分析了变风量系统中不同分区形式对各朝向房间的人均新风量分配的影响,认为新风量分配不均的情况主要出现在冬季和过渡季,提出满足所有朝向房间人员健康要求同时能实现过渡季利用新风节能的新风量设计标准;建议在建筑设计中增加新风竖井面积,在空调外区适当增加最小新风量的取值。 相似文献
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Long Xu Fanghua Zhu Fusheng Zha Qiong Wang Bo Kang Chengbin Yang Wei Zhang Zhenghong Liu 《Soils and Foundations》2021,61(2):444-452
Determination of air pressure and assessment of air losses in clayey soil are of great importance to implementation of compressed air tunneling. In the present work, a series of air flow tests were performed to provide a more reasonable method based on flow characteristics of snap-off pressure and the dissolution/diffusion. Results showed that, the nonlinear air flow behavior and gas breakthrough were presented with the increase in air pressure. After that, the excessive pressure decreased continuously to reach an equilibrium termed as the snap-off. For the tested clayey soil, snap-off pressures around 250 kPa could be adopted as the air pressure, which was significantly lower than the gas breakthrough pressures. Diffusion coefficient of 1.5 × 10-11 m2/s could be determined in the followed dissolution/diffusion stage, which bring 3 orders of decreasing magnitude in air losses compared to the capillary flow occurred after gas breakthrough. As a conclusion, the adoption of snap-off pressure in compressed air tunneling could effectively prevent the continuous air/water flow in clayey soil and create a more human-friendly environment. Additionally, less air losses could be presented compared to that using gas breakthrough pressure, indicating tremendous energy savings in field implementation. 相似文献
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Influence of air supply parameters on indoor air diffusion 总被引:6,自引:0,他引:6
This paper presents the field distributions of air velocity, temperature, contaminant concentration, and thermal comfort in an office with displacement ventilation for different air supply parameters such as the effective area, shape, and dimension of the diffuser and the turbulence intensity, flow rate, and temperature of the air supplied. The research is conducted numerically by using an airflow computer program based on a low-Reynolds-number k-ε model of turbulence. It can be concluded that the effective area, shape, and dimension of the diffuser and the turbulence intensity of the air supplied have little effect on the room air diffusion except at floor level. The influence of the flow rate and temperature of the air supplied is very significant on the air diffusion as well as on the thermal comfort and indoor air quality. 相似文献
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舒适性空调空气过滤器效率计算方法 总被引:6,自引:3,他引:3
给出了舒适性空调空气过滤器效率的设计计算公式,分析了公式中各量的取值范围,以商场和办公室为例计算出了空气过滤器效率,并分析了计算结果。 相似文献
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模拟了同侧上送下回空调房间在送风速度分别为v=1.3 m/s和v=2.6 m/s时,制冷及供暖工况下室内速度场和温度场的分布情况,分析了不同空调送风速度对室内参数的影响,以为工程设计和研究提供参考。 相似文献