共查询到18条相似文献,搜索用时 218 毫秒
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针对工业厂房(高温车间)通风降温要求及目前存在的问题,提出高压喷气结合直接蒸发冷却技术用于工业厂房(高温车间)通风及降温。介绍高压喷气中的压缩空气通过高压喷嘴膨胀、卷吸及掺混室外空气对其一次降温,同时与蒸发冷却技术降温相结合的原理基础上。定量计算了在一些设定条件下单独采用高压喷气的降温效果。通过以西安地区为例分析,当处理的新风量为50000 m3/h,只需要600 m3/h,压力为0.5MPa的压缩空气就能将室外空气的温度降低6~7℃,在与直接蒸发冷却技术相结合不仅能够达到直接蒸发冷却的理论温度,对空气降低8~9℃。利用焓湿图分析了高压喷气与蒸发冷却结合的降温效果,为工业厂房(高温车间)提供了一种新的通风降温技术。 相似文献
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通过试验分析了一次风进口温度、风速、喷淋水量、喷淋水温,对高温高湿地区间接蒸发冷却能量回收系统换热效果的影响。试验结果表明,在干球温度36℃、相对湿度45%时,出口干球温度可达到24.2℃,该气候区下湿球效率在52%~72%,EER在8~25。一、二次风量比为1.1,一次侧迎面风速在2.2 m/s,喷水量在2~2.5 L/min时系统降温能力、湿球效率和EER最高,较低的喷淋水温可有效提高换热效率。提出了高温高湿地区,复合间接蒸发冷却空调系统的运行分区。 相似文献
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《流体机械》2017,(11):79-84
向室内引入新风是解决由装修材料加工工艺导致室内甲醛超标问题的根本方法之一。为了研究不同通风方法的有效性,本文利用Fluent软件,对自然通风和机械通风效果进行研究并分别分析不同送风口温度和不同送风速度对室内不同高度位置处的甲醛浓度的影响。模拟结果表明:自然通风工况下,不同送风温度下的甲醛浓度均超标,机械通风工况下,不同送风速度下的甲醛浓度均未超标;当进风口速度为2 m/s时,甲醛浓度最低;通过数值模拟,同一送风温度下,自然通风甲醛的浓度是机械通风的2.07倍。本文将模拟的2种工况在沈阳、营口进行实测,试验结果与模拟结果基本一致,进一步验证了该结论。 相似文献
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通过ANSYS软件中Fluent模块,对某6.3MW大型感应交流发电机流体场及温度场进行模拟分析。模拟结果显示使用蜗壳式直叶片内冷却扇的原电机冷却系统,电机腔体内冷却空气流动易受电机流道结构及绕组部件阻挡,使得冷却系统出现通风量偏小,零部件换热效率较低等问题。基于降低电机轴消耗功率及提高冷却系统换热效率的优化思路,提出使用轴流式内冷却扇的冷却系统。通过对比分析优化前、后的系统内冷却扇效率、系统通风量、主要发热部件温度分布及内冷却扇局部区域流场等计算数据,得出使用轴流式内冷却扇的冷却系统更符合该电机的流道结构并具有更优的换热性能。 相似文献
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Numerical optimization study to install air curtain in a subway tunnel by using design of experiment
Makhsuda Juraeva Kyung Jin Ryu Sang-Hyun Jeong Dong Joo Song 《Journal of Mechanical Science and Technology》2014,28(1):183-190
Subways are a major mode of public transportation in metropolitan cities. A proper ventilation system is required to maintain indoor air quality in subway tunnels. Platform screen doors improve the platform environment but degrade air quality in subway tunnels. Trains transport fine particles from the tunnel into the platform. An air curtain installation in the subway tunnel permits traffic and reduces the transfer of bacteria and fine particles. The existing tunnel of Seoul subway was investigated by using computational fluid dynamics and design of experiment method for optimum air curtain installations. The flow field of the subway tunnel was computed by using ANSYS CFX software. Minitab software was used to generate the design process and to analyze the computational results. The computational domain of the existing tunnel included two natural ventilation shafts, one mechanical shaft, and the twin tracks. The height, width, and length of each track were 6, 4, and 400 m, respectively. The air curtain installation area was located between the natural and the mechanical ventilation shafts of Rrack 1. The design variables for the optimization study were the width, velocity, and installation location of the air curtain. The object function for optimization was mass flow rate at the natural ventilation shaft. The length of the air curtain was fixed at 4 m. The predicted mass flow rates were analyzed with the design variables by using the response surface method (RSM). The optimum values of the design variables, i.e., velocity, width, and installation location were 25 m/s, 0.2 m, and 5.8195 m, respectively. The maximum mass flow rate with the optimum design values was 114.4447 kg/s. The optimum values of the design variables were validated by computing the tunnel with the optimum values from RSM. The mass flow rate in the natural ventilation shaft 1 was 114.2 kg/s, as predicted. The optimization study can be helpful to set the optimum design conditions for the subway ventilation system. 相似文献
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热回收式溶液除湿蒸发冷却空调制冷系统理论研究 总被引:3,自引:0,他引:3
提出了一种热回收式溶液除湿蒸发冷却空调系统,可以全年运行,借助蒸发冷却技术和直接接触换热器,大幅度降低了冷却水的消耗量,能够回收利用室内排风的冷热量,与同类系统相比,具有更高的运行效率,通过计算和分析,结果表明:蒸发式冷却器是影响冬季热回收量的主要因素,为进一步提高整个系统的性能,其蒸发器、蒸发式冷凝器、蒸发式冷却器应按冬季工况进行设计和匹配,在西安冬夏季空调室外计算参数下,系统的性能系数TCOP、COP和COPh分别为0.925、0.6516和4.17。 相似文献