A thermal circuit method for analysis and optimization of heat exchangers with consideration of fluid property variation

Zhao, Si-Yu; Chen, Qun

doi:10.1016/j.ijheatmasstransfer.2016.03.124

Cited by 26 publications

(5 citation statements)

References 17 publications

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“…由于热量流方法中不对物理过程进行额外的数学简化, 其分析与计算结果更为准确. 目前, 热量流法已被应用于多种热力系统的模拟与优化研究中, 如换热系统 [24] 、蒸汽发电循环 [25] 、有机朗肯循环 [26] 、吸收式储能系统 [27,28] 与制冷系统 [29] 、超临界CO 2 换热 [30] 与发电循环 [31] 、水泥回转窑余热回收系统 [32] 和移动填充床 [33] 等. 由于热系统热量流模型具有电路图的形式, 热量流法也被应用于电-热综合能源系统的分析与优化中 [34,35] .…”

Section: 该方法在工程分析中应用广泛但系统的性能优劣严unclassified

Heat current method for integrated analysis and optimization of thermodynamic systems

Zhao¹,

Chen²,

He³

et al. 2021

Sci. Sin.-Tech.

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Section: 该方法在工程分析中应用广泛但系统的性能优劣严unclassified

Heat current method for integrated analysis and optimization of thermodynamic systems

Zhao¹,

Chen²,

He³

et al. 2021

Sci. Sin.-Tech.

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“…A thermal circuit method is developed by Zhao and Chen 14 to analyze and optimize heat exchangers considering fluid property variation. Two important methods are introduced to design and check the heat exchanger's effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Effect of fluid property variations on the effectiveness of a cryogenic heat exchanger

Etagi,

Katte,

Talya

et al. 2023

Heat Trans

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Cryogenic heat exchangers are commonly used for industrial processes, such as air separation and natural gas liquefaction. Generally, the performance of heat exchangers is analyzed adopting constant properties for the working fluid. But, in cryogenic heat exchangers, fluids reach their critical states with significant variations in their properties. The current work is based on the effect of fluid property variations in the performance analysis of a two‐fluid countercurrent cryogenic heat exchanger subject to ambient heat in a leak. Finite element method–subdomain method is used to conduct the performance analysis. The effect of fluid property variations is analyzed considering effectiveness, ∈, as the performance parameter. The percentage deviation in the effectiveness value on considering fluid property variation is determined. The relationship between effectiveness ∈ and the number of transfer units (NTUs) is obtained by plotting the ∈‐NTU curve by varying the mass flow rate of the fluid flow. A maximum deviation of 16.108% in the effectiveness and 58.734% in the hot fluid exit temperature is obtained by considering fluid property variation.

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“…For engineering purposes, the logarithmic mean temperature difference and the HE effectiveness-number of transfer units methods are the most straightforward approaches for designing and checking the HE performance. These methods neglect some effects including heat leakage to the environment, longitudinal heat conduction, variation of the fluid properties and flow maldistribution (Zhao and Chen, 2016;Venkataram and Seetharamu, 2018). By ignoring these effects, especially property variation in the cryogenic temperature ranges, the HE may fail to meet the desired performance (Soyars, 1994).…”

Section: Introductionmentioning

confidence: 99%

“…The first is to appropriately divide HEs into several smaller heat transfer segments in which fluid properties are kept constant, and each segment is separately analyzed by applying the traditional constant property methods. The second procedure is based on solving the differential and the algebraic equations of HEs (Zhao and Chen, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…They found that the overall heat transfer coefficient varies linearly with respect to either cold or hot fluid temperature. The thermal circuit method was applied to investigate the effect of fluid property variations on the performance of the HEs by Zhao and Chen (2016). However, there is comprehensive information about fluid property variation in conventional HEs, but in special HEs such as SWHEs, more investigations are necessary to study the supercritical fluid characteristics.…”

Section: Introductionmentioning

confidence: 99%

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An analytical method for spiral-wound heat exchanger: design and cost estimation considering temperature-dependent fluid properties

Hosseinian

Abolmaali

Afshin

2020

HFF

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Purpose Spiral-wound heat exchangers (SWHEs) are widely used in different industries. In special applications, such as cryogenic (HEs), fluid properties may significantly depend on fluid temperature. This paper aims to present an analytical method for design and rating of SWHEs considering variable fluid properties with consistent shell geometry and single-phase fluid. Design/methodology/approach To consider variations of fluid properties, the HE is divided into identical segments, and the fluid properties are assumed to be constant in each segment. Validation of the analytical method is accomplished by using three-dimensional numerical simulation with shear stress transport k-ω model, and the numerical model is verified by using the experimental data. Moreover, the HE cost is selected as the main criterion in obtaining the proper design, and the most affordable geometry is selected as the proper design. Findings The accuracy of different heat transfer and pressure drop correlations is investigated by comparing the analytical and numerical results. The average errors in the calculation of effectiveness, shell-side pressure drop and tube-side pressure drop using the analytical method are 2.1%, 13.9% and 13.3%, respectively. Moreover, the effect of five main geometrical parameters on the SWHE cost is investigated. The results indicate that the effect of longitudinal pitch ratio on the SWHE cost can be neglected, whereas other geometrical parameters have a significant impact on the total cost of the SWHE. Originality/value This work contains a versatile and low-cost analytical method to design and rating the SWHEs considering the variable fluid property with consistent shell geometry. The previous studies have introduced complex methods and have not considered the consistency of shell geometry.

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A thermal circuit method for analysis and optimization of heat exchangers with consideration of fluid property variation

Cited by 26 publications

References 17 publications

Heat current method for integrated analysis and optimization of thermodynamic systems

Heat current method for integrated analysis and optimization of thermodynamic systems

Effect of fluid property variations on the effectiveness of a cryogenic heat exchanger

An analytical method for spiral-wound heat exchanger: design and cost estimation considering temperature-dependent fluid properties

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