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介绍管壳式换热器的布管方法,包括正三角形排列和正方形排列。根据不同流程、不同排列方式,编制单程布管程序,计算机能自动绘出布管图。 相似文献
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非管壳式节能换热器及其应用(二)中国石化总公司上海高桥石油化工公司炼油厂钱伯章1.3.4在炼油厂的推广应用例如用于:原油和含33体%盐水的乳化液换热,12800kg/h原油从108℃冷却至68℃,94300kgth乳化液从46℃加热至85℃,换热面积... 相似文献
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非管壳式节能换热器及其应用(一)中国石化总公司上海高桥石油化工公司炼油厂钱伯章为顺应石化工业节能要求,换热器向体积紧凑、传热强化方向发展。近年,非管壳式紧凑型换热器得到开发和推广应用。所谓紧凑式换热器主要指板式(含压焊板式)、板翅式、螺旋板式、筒式、... 相似文献
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管壳式换热器动态特性分析 总被引:2,自引:0,他引:2
针对液相不可压缩流体工质在管壳式换热器进行热交换的情况,以控制微元体的质量守恒方程,能量守恒方程,动量守恒方程及状态方程为基础,采用流量温度参数过程离技术,建立了不同通道动态特性的分布参数表达式。分别对这些微分方程组执行时间和空间拉普拉斯变换之后,可以获得以传递函数形式表示的壳式换热器输入-输出的数学模型。 相似文献
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本文利用Bell-Delaware方法编制了管壳式换热器热力计算通用程序,并进行了实例计算,程序中对某些参数的选取以及修正系数的计算作了特别处理,使程序更有通用性,以年总经济费用最小作了优化设计,得到了优化设计的结果,计算结果反映了流体流动从层流到紊流的转变,本文编制的管壳式换热器计算机辅助设计程序和优化程序可用作工程设计的参考。 相似文献
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为了分析结构形式和流动状态等因素对换热器换热效果的影响,首先,以单根圆管换热器为研究对象验证了SolidWorks Flow Simulation软件进行仿真分析的可行性。然后,基于该软件分析了流动形式和扁管厚度对扁管换热器换热性能的影响,并拟合了扁管沿程摩擦阻力系数计算公式。研究结果表明,本文所提数值模拟方法是有效地,所得扁管沿程摩擦阻力系数计算公式具有一定的参考价值。 相似文献
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本利用作提出了改进SIMPLE算法,在2维紊流条件下,以实际的换热器芯体作为入口集流室的阻力部件来定义出口条件,采用贴体正交曲线坐标网格,对3种典型的换热器入口集流室进行了流数值模拟,并进行了必要的实验验证,结果显示了流动的不均匀和不稳定性,为设计合理的换热器入口集流室的结构提供了方向。 相似文献
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A simulation technique for predicting the thermal performance of rotary regenerative heat exchangers, in particular those used for heating the intake air to power station boilers, has been developed and verified by means of site measurements. Various geometries of both rotating-hood and rotating-matrix types of air heaters can be accommodated in the simulation model, including packings of corrugated steel plates of various specified profiles and any given thicknesses and lengths in the flow direction. Rotational speed, leakage, blockage, and non-uniform inlet flow distribution may be taken into account as input variables. The heat transfer and pressure drop correlations for the various plates considered, which also form part of the input data, were determined experimentally using a single-blow transient test facility, constructed as part of this research program. The effect of erosion of the plates by fly ash particles carried in the outlet flue gas on heat transfer performance is also considered, and experimental results show that erosion has little effect on the thermal performance (up to the point that structural integrity is about to be compromised), but also that the pressure drop is reduced. 相似文献
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Jojomon Joseph Rabia Nacereddine Michel Delanaye Jan G. Korvink Juergen J. Brandner 《传热工程》2020,41(11):934-946
AbstractThe objective of this paper is to predict compact heat exchanger (CHE) performance for a miniaturized combined heat and power system by a detailed modeling of the complex microchannels and assessing the collector performance using a new reduced order modeling (ROM). The ROM was introduced to decrease the computational size and predict the collector performance with a reasonable accuracy. The CHE is assembled as a stack of counter-flow passages with optimized thickness and an isotropic wire-net (to provide required stiffness and enhance the mixing) which separates the thin partition foils. Computational fluid dynamics (CFD) methodology comprises of conjugate heat transfer (CHT) analysis for a microchannel section and ROM to analyze the entire CHE performance based on the collector performance. The porous medium model, based on the Darcy-Forchheimer law, is modified (constant integration method) to account for the temperature evolution and localized turbulence effects. The resulting microchannel characteristics from a series of three-dimensional CFD-CHT analysis are used to calculate the inertial and viscous coefficients using the constant integration method. These characteristics have been implemented and verified numerically as well as experimentally. The best-revised methodology allows obtaining pressure drop with less than three percent error with respect to the CHT model. 相似文献
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C. Oliet C. D. Pérez-Segarra J. Castro 《Numerical Heat Transfer, Part A: Applications》2013,63(3):193-210
This article presents a model for the analysis of fin-and-tube heat exchangers, focusing on the heat conduction processes within the finned tube bundle. A cutting cell discretization has been proposed for the fins to adapt to the tubes shape, while the tubes have been discretized in axial and angular directions to consider complex heat transfer coefficient variations. A set of results is given on fin efficiency and transient response comparing with well-established methods. A full-scale condenser is also analyzed as an illustrative result, detecting important thermal bridges through the fins. 相似文献
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