Analysis of the Flow and Temperature Fields of the Cab to Design an Air Supply Inlet Location Using Fluent Simulation Software

Author(s):  
Special Issues Editor
2020 ◽  
Vol 866 ◽  
pp. 82-95
Author(s):  
Guang Yao Li ◽  
Yang Cao ◽  
Tao Yue Yang ◽  
Wen Qing Ma

Aiming at the problems of large temperature differences and inconsistent baking speeds at different positions in the tobacco chamber of the tobacco baking room, this paper proposes a complex structure processing technology of fan vent. according to the structure and drying principle of the baking room, ANSYS fluent simulation software was used to analyze the processing parameters of the heat flow field inside the baking room. combining the characteristics of positive and negative air supply baking, the processing and manufacturing parameters of the baking room were optimized, and then the baking comparison test was performed. The results show that: the forward and reverse air-baking method and the complex structure reduces the temperature difference in the interior of the smoke chamber; the forward and reverse air-bake method reduces the baking time by 11 hours, and reduces the coal consumption and power consumption by 12.6%, 48.5%, the standard deviation of temperature monitoring points in the baking room decreased by 44%.


Author(s):  
Juan de Dios Unión-Sánchez ◽  
Manuel Jesús Hermoso-Orzáez ◽  
Manuel Jesús Hervás-Pulido ◽  
Blas Ogáyar-Fernández

Currently, LED technology is an established form of lighting in our cities and homes. Its lighting performance, durability, energy efficiency and light, together with the economic savings that its use implies, are displacing other classic forms of lighting. However, some problems associated with the durability of the equipment related to the problems of thermal dissipation and high temperature have begun to be detected, which end up affecting their luminous intensity and the useful life. There are many studies that show a direct relationship between the low quality of LED lighting and the aging of the equipment or its overheating, observing the depreciation of the intensity of the light and the visual chromaticity performance that can affect the health of users by altering circadian rhythms. On the other hand, the shortened useful life of the luminaires due to thermal stress has a direct impact on the LCA (Life Cycle Analysis) and its environmental impact, which indirectly affects human health. The purpose of this article is to compare the results previously obtained, at different contour temperatures, by theoretical thermal simulation of the 3D model of LED street lighting luminaires through the ANSYS Fluent simulation software. Contrasting these results with the practical results obtained with a thermal imaging camera, the study shows how the phenomenon of thermal dissipation plays a fundamental role in the lighting performance of LED technology. The parameter studied in this work is junction temperature (Tj), and how it can be used to predict the luminous properties in the design phase of luminaires in order to increase their useful life.


2013 ◽  
Vol 773 ◽  
pp. 883-888 ◽  
Author(s):  
Hamid Nawaz ◽  
Yan Sheng Yuan

The focus of this work is to simulate and optimize thermal comfort in a ship air-conditioning system by evaluating the performance of different types of air supply outlets. Thermal comfort analyses were performed in Solidworks Flow Simulation software by changing the number, type and position of air supply outlets and the comfort was optimized by evaluating the values of temperature, velocity, PMV (Predicted mean vote) & PPD (Predicted Percentage Dissatisfied). It was concluded from the results obtained from different analyses that air supply outlet is a vital part in any type of HVAC (Heating ventilation & air conditioning) system design, as its number, type and position has significant effect on the air distribution and thermal comfort in a subject space. It was also deduced that improper selection of air supply outlet can result in room air stagnation, unacceptable temperature gradients, and undesirable velocities in the occupied zone that may lead to occupant discomfort. Through this work the importance and effectiveness of CFD (computational fluid dynamics) design tools, in the design & optimization of HVAC systems has been evaluated and it was concluded that CFD design software like Solidworks flow simulation provide an excellent provision to validate different aspects of HVAC design before actual construction.


2014 ◽  
Vol 1008-1009 ◽  
pp. 1088-1091
Author(s):  
Lan Xia Guo ◽  
Xiao Yong Peng ◽  
Jian Xiang Liu ◽  
Xu Sheng Chai ◽  
Jing Jing Liang ◽  
...  

Airpak was applied to numerically simulate the air distribution under the same air supply temperature ,different air supply velocity (3.6m/s、2.7m/s and 1.8m/s ) and air supply angle (+15°、-45° and-75°) , and evaluate thermal comfort by Comparative analysis velocity fields, temperature fields, PMV—PPD. The results show that different air supply velocity and air supply angle have a significant impact on indoor air distribution under the same air supply temperature. Air supply angle Plays a vital role in pattern and distribution of indoor flow field,air supply velocity mainly effect the magnitude of indoor velocity and temperature. Synthetically comparied, the model’s best supply parameters are supply velocity 2.7m/s and supply angle75°,which mean value of indoor PMV is-0.09, PPD is 8.5%.


2015 ◽  
Vol 9 (1) ◽  
pp. 411-415
Author(s):  
Liu Fei ◽  
Zhang Dongliang

The excellent desk personalized ventilation scheme is found in this paper by the way of comparing the four winter air supply schemes, basing on the numerical simulation software of CFD. We find that air supply quality and air supply angle are both the important factors to personalized ventilation individual comfort in winter. The air temperature and velocity surrounding the human body of the excellent desk personalized ventilation scheme are discussed. It comes to the conclusions that under simulated conditions the excellent desk personalized ventilation scheme can better satisfy the human body comfort on the surrounding air temperature and healthy than the traditional air conditioning, and it is easier to achieve energy saving too.


2013 ◽  
Vol 718-720 ◽  
pp. 1221-1227
Author(s):  
Dong Wu Feng ◽  
Gui Li Xu ◽  
Biao Wang ◽  
Yu Peng Tian ◽  
Yong Qiang Ye

In this paper, a novel approach to improve the infrared cooperative object for accurately landing is proposed. We present the designed cooperative object system and the blurring around the object when its working, and then begin our basic research on the cooperative object. We analyzed the formation principle of thermal blurring in the infrared imaging mechanism. After a detailed analysis infrared thermal blurring from thermodynamic principle, we derived the main factors of the infrared thermal blurring, and used Fluent simulation software to simulate the formation of thermal blurring. At the same time, the paper optimized the design of cooperation target to reduce thermal blurring. Experiments show that the optimum design of the cooperation objectives thermal blurring has significantly improved compared with some other methods.


2008 ◽  
Vol 575-578 ◽  
pp. 1204-1209
Author(s):  
Guo Fa Mi ◽  
Heng Tao Zhao ◽  
Kuang Fei Wang ◽  
Zhi An Xu ◽  
Ji Tai Niu

The temperature at specific positions was measured by multi-channel data acquisition system in order to understand the solidification and feeding process of the sample. The Olympus metallurgical microscope was used to observe the macrostructure of the casting and analyze the freezing mechanism. The mold filling and solidification processes of the Al-alloy sample were studied by using the commercialized simulation software Z-Cast. And the simulated result was compared with the results of practical pouring test. When preheat temperature of mold is low, the pouring temperature should be higher in order to ensure completely filling of mold. As a result the solidification of sample could be feeding effectively, and the shrinkage on the upper end of sample could be eliminated. It is shown that the casting simulation software Z-CAST can be used to simulate the filling and solidification process of gravity cast Al alloy and can provide exact flow fields and temperature fields thus can predict cast defects and their positions.


2016 ◽  
Vol 75 (3) ◽  
pp. 552-560 ◽  
Author(s):  
Oliver Schraa ◽  
Leiv Rieger ◽  
Jens Alex

During the design of a water resource recovery facility, it is becoming industry practice to use simulation software to assist with process design. Aeration is one of the key components of the activated sludge process, and is one of the most important aspects of modelling wastewater treatment systems. However, aeration systems are typically not modelled in detail in most wastewater treatment process modelling studies. A comprehensive dynamic aeration system model has been developed that captures both air supply and demand. The model includes sub-models for blowers, pipes, fittings, and valves. An extended diffuser model predicts both oxygen transfer efficiency within an aeration basin and pressure drop across the diffusers. The aeration system model allows engineers to analyse aeration systems as a whole to determine biological air requirements, blower performance, air distribution, control valve impacts, controller design and tuning, and energy costs. This enables engineers to trouble-shoot the entire aeration system including process, equipment and controls. It also allows much more realistic design of these highly complex systems.


Author(s):  
А.А. Таранцев ◽  
А.Д. Ищенко ◽  
А.А. Таранцев

Рассмотрена проблема обеспечения пожарной безопасности объектов в Арктической зоне и районах Крайнего Севера, в частности, инфраструктуры Северного морского пути. Показано, что ввиду высокого риска возникновения пожаров на таких объектах и сложности их тушения из-за сложности использования воды при экстремально низких температурах, целесообразно использовать инновационные способы тушения. Такой способ, заключающий в продувке горящего объёма низкотемпературным наружным воздухом (с дополнительной подачей ограниченного количества снега и распылённой воды в летний период), был запатентован и обоснован теоретически и посредством проведения компьютерного эксперимента. Для подтверждения эффективности способа были проведены эксперименты – сначала демонстрационный по подавлению горения очага путём продува прибором «Буран» ДПЭ-15 при температуре 00С, а затем модельный с подачей холодного воздуха с последующим добавлением распылённой воды и снега. В ходе эксперимента, проводимого на базе подразделения Государственной противопожарной службы был собран цилиндрический имитатор модуля (1:5) и осуществлялась видеорегистрация процесса подавления горения в имитаторе с фиксацией температурных полей тепловизором. Была доказана возможность безопасного проникновения пожарных в модуль со стороны подачи воздуха и их действий по тушению остаточных очагов, а также возможность полного подавления пожара при подаче ограниченного количества снега и распылённой воды в воздушную струю. В результате была не только теоретически, но и экспериментально обоснована возможность применения инновационного способа подавления пожара в модулях арктических объектов. The problem of ensuring fire safety of objects in the Arctic zone and the Far North, in particular, the infrastructure of the Northern Sea Route, is considered. It is shown that due to the high risk of fires at such facilities and the complexity of their extinguishing due to the complexity of using water at extremely low temperatures, it is advisable to use innovative methods of extinguishing. This method, which consists in purging the burning volume with low-temperature outdoor air (with an additional supply of a limited amount of snow and sprayed water in the summer), was patented and justified theoretically and through a computer experiment. To confirm the effectiveness of the method, experiments were conducted – first a demonstration one on suppression of burning by blowing the DPE-15 device with the Buran device at a temperature of 00C, and then a model one with cold air supply followed by the addition of sprayed water and snow.During the experiment, conducted on the basis of the State Fire Service division, a cylindrical simulator of the module (1:5) was assembled and video recording of the suppression process was carried out in the simulator with the thermal imager recording the temperature fields. The possibility of safe penetration of firefighters into the module from the air supply side and their actions to extinguish residual foci, as well as the possibility of complete suppression of the fire when a limited amount of snow and sprayed water is supplied to the air stream, was proved. As a result, the possibility of using an innovative method of fire suppression in the modules of Arctic objects was not only theoretically, but also experimentally justified.


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