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首页> 外文会议>International refrigeration and air conditioning conference at Purdue >Evaluation of Defrost Options for Secondary Coolants in Secondary Loop Multi-temperature Transport Refrigeration Systems - Mathematical Modelling Sensitivity Analysis
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Evaluation of Defrost Options for Secondary Coolants in Secondary Loop Multi-temperature Transport Refrigeration Systems - Mathematical Modelling Sensitivity Analysis

机译：二次回路多温度运输制冷系统中二次冷却剂除霜方案的评估-数学建模和灵敏度分析

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摘要

This paper describes a mathematical model of the defrost process for a finned-tube air chiller, utilised as a heat exchanger in a secondary loop multi-temperature transport refrigeration system, where an antifreeze mixture is deployed as a sensible secondary working fluid. Two defrost modes are modeled: an electric mode which effects defrost by localised resistance heating of the chiller secondary working fluid, and a hot gas primary circuit mode that indirectly heats the secondary working fluid by means of a primary to secondary heat exchanger. The model, which was implemented using the Engineering Equation Solver (EES), is based on a finite difference approach to analyse the heat transfer from the secondary working fluid, through a single finned heat exchanger section, to the frost. An iterative scheme is used to integrate for the overall heat exchanger, taking into account temperature glide associated with the secondary working fluid. The overall heat exchanger model is incorporated within a system defrost model, which allows the entire defrost process to be modeled. The model was validated for the standard United Nations Agreement on Transportation of Perishable Produce (ATP) for cold room set-points of 0°C, -10°C and -20°C, by comparison with experimental data from a full scale laboratory based test programme. The validated model is used to carry out defrost sensitivity studies which examine defrost behavior for a range of performance parameters.
机译：本文描述了翅片管空气冷却器除霜过程的数学模型，该翅片管空气冷却器在二级回路多温度传输制冷系统中用作热交换器，在该系统中，防冻液被用作敏感的二级工作流体。对两种除霜模式进行了建模：通过制冷机辅助工作流体的局部电阻加热实现除霜的电模式，以及通过一次至二次热交换器间接加热辅助工作流体的热气一次回路模式。该模型是使用工程方程求解器（EES）实施的，该模型基于有限差分方法，用于分析从二次工作流体通过单个翅片式换热器段到霜的热传递。考虑到与辅助工作流体相关的温度滑移，使用迭代方案将整个热交换器集成在一起。整体换热器模型包含在系统除霜模型中，该模型可以对整个除霜过程进行建模。通过与来自大型实验室的实验数据进行比较，该模型已针对0°C，-10°C和-20°C冷藏室设定点的标准《联合国易腐产品运输协定》（ATP）进行了验证。测试程序。经过验证的模型用于进行除霜敏感性研究，检查除霜行为的一系列性能参数。

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