关键词：
Air Film;Numerical Simulation;Coanda Effect;Cooling
摘要：
Large-span air-conditioning plant rooms have a large roof area and suffer from serious solar radiation in summer. The outside roof surface temperature is very high, so cooling load of roof occupies a large proportion in the envelope structure cooling load of large-span air-conditioning plant rooms. Based on the Coanda airfoil air induction unit, the author combined with exhaust air in large-span air-conditioning plant rooms to design the roof air film cooling system of large-span air-conditioning plant rooms. The adherence air film formed on the outside surface takes away heat on the outside surface of the roof, so as to reduce outside roof surface temperature of the roof, decrease heat transfer temperature difference between inside and outside roof surfaces of, and reduce roof cooling cold. Furthermore, the mathematical model and numerical simulation method of considering fluid-structure interaction for heat transfer and influences of solar radiation on air film formation of outside surface and cooling were constructed. Moreover, the numerical simulation method was conducted the validation of effectiveness. Also, the author discussed the air film formation mechanism and air film cooling ability of outside surface in large-span air-conditioning plant rooms without natural wind, developed a new air film cooling technology for the roof of large-span air-conditioning plant rooms, and supplemented the existing roof cooling technology.
摘要：
The large space industrial building as the research object, established a two-dimensional physical model, using the CFD numerical simulation software simulate the partition effect that an air curtain to indoor pollutants, and analyzed the different exhaust form and air curtain's parameters such as the width, air supply velocity to the influence of the partition effect that an air curtain to indoor pollutions. The results show that the appropriate air curtain's width and air supply velocity will play the important role of good partition to indoor pollutants. When the width of the air curtain is too narrow, it will not good for the partition effect, but when the width is too wide, it is not economic; on the other hand, when the velocity of the air curtain is too big or too small, it also can't have better partition effect. From the perspective of indoor environment protection and energy saving, the air curtain is used in the indoor environment control and research out of the optimal parameters of an air curtain for good partition effect will be of great significance.
摘要：
The flow fields of single airfoil model and symmetry airfoil model were simulated by CFD software in this paper. the different inducing velocity and the airfoil intervals were considered to study the flow field and the induction rate change of the models. The results show that the induction rates of the single airfoil model and the symmetry airfoil model enlarge when the inducing velocity increases, and gradually reaching a steady value. As interval of the symmetry airfoil model is increased, the induction rate increases. The air flow from the narrow slits of symmetry model can be mixed and disturbed each other. Therefore, the induction rate of symmetry airfoil model is not a simple superposition of the single airfoil model under the same inducing velocity. Induction rate and airfoil interval are the key factors to optimize the airfoil model.
会议名称：
International Conference on Modeling, Simulation and Optimization Technologies and Applications (MSOTA)
会议时间：
DEC 18-19, 2016
会议地点：
Xiamen, PEOPLES R CHINA
会议主办单位：
[Ye, Yaling;Peng, Xiaoyong;Zhang, Yuan;Wei, Hu] Univ South China, Urban Sch Construct, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称：
ACSR-Advances in Comptuer Science Research
关键词：
coanda effect;numerical simulation;inducing velocity;ventilation fan
摘要：
The airfoil ventilation fan based on Coanda effect was studied, which was simulated by Fluent software. The inducing velocity was considered as an important influence factor on the characteristic of t
摘要：
Using CFD technology, the flow field and pollutant concentration distribution of fume cupboard was simulated, and the accuracy of the numerical simulation was verified by comparison with the measured face velocity. The simulation results show that flow field distribution is turbulence, and generates vortex at the base single and upper mouth easily. It also indicates: in a single exhaust air rate, the monitor point concentration increased with the increase of pollution gases release quantity; in a single pollutant gas release quantity, the monitor point concentration was decreased with the increase of exhaust air rate, and achieve a certain exhaust air rate, the monitor point concentration reduced to the lowest.
摘要：
Refrigerated truck as the research object, using the CFD numerical simulation software simulate the dynamic temperature field of refrigerated truck with a internally suction type air curtain, it emphatically analyzes the influence of the export velocity of the internally suction type air curtain to the refrigerated truck's heat preservation performance when door is opened. The results show that the suitable export velocity of the air curtain can improve the insulation performance of the refrigerated truck, but when the export velocity is too large, the opening of the air curtain not only can not improve the heat preservation performance of refrigerated truck, but aggravate the heat and mass exchange between inside cold air and outside hot air. From the perspective of energy saving, researching the best export velocity of air curtain to insure that refrigerated truck has the best heat preservation performance, which will has great significance to the refrigerated truck's energy-saving design.
作者机构：
[Fu, Zhi-Qiu; Liang, Jing-Jing; Chai, Xu-Sheng; Ye, Ya-Ling; Guo, Lan-Xia; Peng, Xiao-Yong] Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议名称：
International Conference on Energy and Environment Engineering (ICEEE)
会议时间：
APR 11-12, 2015
会议地点：
Nanjing, PEOPLES R CHINA
会议主办单位：
[Chai, Xu-Sheng;Peng, Xiao-Yong;Guo, Lan-Xia;Liang, Jing-Jing;Fu, Zhi-Qiu;Ye, Ya-Ling] Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.
关键词：
Bag Filter;Numerical Simulation;Flow Field;Uniformity of Air Flow
摘要：
Based on CFD technology, the present paper is aimed at using numerical simulation to analyze uniformity of air flow of downward inlet and external filtration style bag filter under different inlet air velocities. The simulation results show that the distribution of air flow in jet direction on both sides of the filter bags is higher under different inlet air velocities in bag filter. On condition of inlet air velocity is 5.8m/s, 6.9m/s, 8.1m/s, 9.3m/s respectively, the maximum relative deviation of filter bag flow distribution is 24.54%, 26.93%, 29.27%, 31.38%, as the velocity increases, the inhomogeneity of air flow distribution increases. Based on the characteristics of air flow distribution under the same inlet air velocity, through the measures such as expanding joint area of inlet air duct and filter, baffle and blunt body are installed in ash hopper, it not only reduces the flow difference of filter bag to make the maximum relative deviation of the filter bag less than 15%, improved the phenomenon of uneven air distribution, but also reduces the filter resistance by 9Pa-47Pa than that before optimization (5.8m/s-9.3m/s).
摘要：
Using the numerical simulation method, this thesis studies the radon concentration distribution in downwind area of the flat ground uranium tailings impoundment with and without vegetation on the beach face under the wind speed of 0.5, 1.0, 2.0 and 4.0m/s. The numerical results show that the radon concentration decreases gradually with the increasing wind speed and distance from uranium tailings impoundment. As the wind speed is 0.5m/s, the radon concentration is higher in downwind area of uranium tailings impoundment, and accumulation range is larger and local pollution also becomes more serious. However, radon concentration and accumulation range falls rapidly with wind speed increased to 4.0m/s. At the same wind speed, radon concentration under the condition of beach face with vegetation is higher than the one without vegetation within 600m range of uranium tailings impoundment along the downwind direction, but radon concentration is lower under the condition of beach face with vegetation out of 600m range. It illustrates that vegetation can inhibit radon diffusion to some extent.
摘要：
The influencing factors on radon emanation rate of uranium tailings storehouse, migration mechanism, theoretical research of the radon emanation and research status of radonmetry were introduced. Reasonable measurement, network, sampling time and measuring times are very necessary to the measurement of radon emanation rate of uranium tailings. Combining numerical simulation, physical experiment simulation and field test, put forward reasonable management standards for decommissioning uranium tailings.
作者机构：
[Yao, Lin; Wan, Fen; Liu, Zhenhao; Xie, Jingfang; Peng, Xiaoyong] School of Urban Construction, University of South China, No.28 Changsheng West Road, Hengyang, 421001, China
关键词：
Air Distribution;Large Space Building;Numerical Simulation;Poison Gas Diffusion
摘要：
The numerical simulation of indoor airflow and poison gas diffusion and transport process is given for different air systems of air-conditioning in large space buildings in this paper. The numerical results show that the poison gas diffusion is affected by indoor airflow, and the variety air systems make the characteristics of poison gas diffusion differently. After arriving at the air return, the poison gas will soon be sprayed from the air inlet of the air system to the whole space which is serviced by the air system.
