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指出了在空调房间末端冷量可调的变风量空调系统,对制冷设备客量选择具有很大影响的室内冷负荷应当以空调建筑中所有房间逐时冷负荷的综合最大值为依据。并以旁通型变风量集中空调系统为例,对空调系统设计冷负荷的计算方法进行了分析讨论。 相似文献
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为提高地下地铁车站的负荷计算精度,解决能源地下车站的地埋管换热量设计问题,以大连地铁4号线地下地铁车站为研究对象,采用3种负荷计算(DeST模拟、规范算法、逐时算法)方法计算地下车站全年负荷,并分析讨论地下车站设备管理用房区的全年负荷特征,进一步确定能源地下车站地埋管换热量。结果表明:地铁车站能源需求具有明显的逐时波动性和环境参数相关性,通过逐时负荷计算方法获得的全年总负荷较规范算法和DeST模拟结果的精确度可提高约1倍;不同功能用房负荷差异较大,办公用房的供热需求大于制冷需求,设备用房和变电所用房全年无需供热,且变电所用房的冷负荷远大于设备用房;逐时算法得到的换热量可准确反映全年换热需求,其地埋管换热量的不均衡率高达7.14。 相似文献
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介绍广东某甲级写字楼楼宇型能源站设计案例.通过冷、热、电负荷指标和用户使用习惯,选取适当的负荷系数,计算写字楼典型日的逐时冷、热、电负荷曲线,及各月供冷量、供热量和用电量.依据写字楼各能源负荷需求,能源站系统设计方案配置了燃气发电机组、余热利用设备、调峰设备、蓄能设备.设计方案实现了写字楼供能系统中能源的梯级利用,提高... 相似文献
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DeST能耗模拟软件在某建筑冷热源方案分析中的应用 总被引:1,自引:0,他引:1
采用DeST软件建模分析了上海市某商业综合楼的负荷状况,并利用负荷分析结果进行了冷热源的装机容量分析降低了该项目设备的设计装机容量.同时,利用DeST软件计算所得的全年逐时负荷对建筑的蓄冷冷源的选型进行了分析,为蓄冷冷源的设计分析方法提供了新思路. 相似文献
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《International Journal of Hydrogen Energy》2022,47(63):26789-26797
The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO2 and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized. 相似文献
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Linear and nonlinear analyses of the instabilities and distortion of liquid streams injected into a gaseous media are discussed. The various fundamental mechanisms and the predictive capabilities for the distortions are emphasized. Round jets, planar sheets, annular sheets, and conical sheets are discussed in detail. The balance between capillary and inertial forces is primarily examined. The method for simplifying the analyses in the case of thin liquid sheets is discussed. The capabilities for representing the droplet size distribution that follows the stream disintegration are outlined. 相似文献
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基于《水工混凝土掺用氧化镁技术规范》中的Ⅰ型氧化镁(MgO),研究了该型MgO膨胀剂(MEA)细度对掺粉煤灰水泥浆体膨胀性能的影响。即采用X射线衍射分析(XRD)及同步热分析(TG DSC)分析了掺MEA水泥浆体中MgO的水化性。结果表明,养护温度相同时,MEA的细度对水泥浆体内MEA中MgO的水化和水泥浆体的膨胀无显著影响,产生的膨胀均能补偿水泥浆体的收缩;MEA的细度可从试验设计采用的45 μm筛筛余15%左右增加到30%左右,这将有利于MEA生产企业的节能降耗。 相似文献
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使用ANSYS8.0软件对高速列车车轮进行了三维有限元分析,计算出车轮在直线、曲线和道岔条件下牵引、制动共6种工况时孔边薄弱部位的应力,分别通过Mises等效平均应力方法、Sines平均主应力方法和应力分量中考虑平均应力方法计算出应力在极值位置时的等效应力幅、等效平均应力,从而进一步算出车轮的安全系数,对其疲劳强度进行评定,并对3种方法进行了比较研究。 相似文献
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M.R. Salimpour M. SharifhasanE. Shirani 《International Communications in Heat and Mass Transfer》2011,38(1):93-99
This paper documents the geometric optimization of an array of circular and non-circular ducts. The optimization was carried out numerically using finite volume method. As optimal dimensions were independent of the array configuration, the numerical simulation was performed on a unit cell. Numerical optimization for circular, square and isosceles right triangle cross-sections of channels was performed. Based on the results of this investigation, some correlations were proposed to predict the optimal hydraulic diameter and dimensionless heat transfer per unit volume. In addition to examining the effect of pressure drop on these parameters, it was showed that among the different geometries of this study, square cross-section has the most efficiency for a given volume. The numerical results of the present study were compared with approximate results reported in the literature which a good agreement was observed. 相似文献
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General expressions for the heat of vaporization of mixtures at constant pressure; at constant temperature; and at constant pressure, temperature, and composition are proposed. The last one is related to the liquid-vapor interface where steady vaporization or condensation is taking place. Numerical examples by the proposed expressions are shown for binary mixtures of HCFC22(R22) and (HCFC123(R123) © 1997 Scripta Technica, Inc. Heat Trans Jpn Res, 25(1): 12–24, 1996 相似文献
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本文对漫灰均温物体在常物性条件下对外辐射传热的Yong值计算建立了数学模型。通过与物体内能Yong公式的数值计算比较,得出了辐射能量的Yong值不大于内能Yong值的结论。从初步的热射Yong值计算公式发现。Yong与物体表面辐射率有关。 相似文献