A novel coupling discretization method for modeling multi-phase heat exchangers

IF 1.1 4区工程技术 Q4 THERMODYNAMICS Thermal Science Pub Date : 2023-01-01 DOI:10.2298/tsci220909044c

Zhenhao Chu, Daocang Che, Zhaowang Xia

引用次数: 0

Abstract

This paper presents a novel coupling discretization method for modeling multi-phase heat exchangers. In the method, the MBM (Moving Boundary Method) is adopted as the solver to solve each of the FVCVs (Finite Volume Control Volume) divided by the method of FVM (Finite Volume Method). When all FVCVs are solved, the FVCV boundary values are updated based on the relationships of FVCVs. The solving procedure is initiated when the starting values of HSF (Hot Source Fluid) and CSF (Cold Source Fluid) outlet of the heat exchanger are given by the user and terminated when these values no longer change anymore. The experimental results of a plate heat exchanger with R245fa and Therminol 66 as CSF and HSF are adopted to validate the proposed model. Simulation results of 11 operating conditions show that the maximum deviation is within ?4% compared to the measured values. The model presented in this paper is appropriate for heat exchangers under operating conditions either with or without fluid phase change, such as the evaporator and condenser in the ORC (Organic Rankine Cycle) system.

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一种新的多相换热器耦合离散化建模方法

提出了一种新的多相换热器耦合离散化建模方法。该方法采用移动边界法(MBM)作为求解器，求解由有限体积法(FVM)划分的每个有限体积控制体积(fvcv)。求解所有FVCV后，根据FVCV之间的关系更新FVCV的边界值。当用户给出换热器出口HSF (Hot Source Fluid)和CSF (Cold Source Fluid)的启动值时，开始求解程序，当这些值不再变化时，终止求解程序。采用R245fa和Therminol 66作为CSF和HSF的板式换热器的实验结果验证了所提出的模型。11种工况的仿真结果表明，与实测值相比，最大偏差在?4%以内。本文所建立的模型适用于有或无流体相变工况下的换热器，如ORC(有机朗肯循环)系统中的蒸发器和冷凝器。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermal Science 工程技术-热力学

CiteScore

2.70

自引率

29.40%

发文量

399

审稿时长

5 months

期刊介绍： The main aims of Thermal Science to publish papers giving results of the fundamental and applied research in different, but closely connected fields: fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes in single, and specifically in multi-phase and multi-component flows in high-temperature chemically reacting flows processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering, The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.