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首页> 外文期刊>International Journal of Refrigeration >Modelling and experimental validation of the hot-gas defrost process of an air-cooled evaporator
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Modelling and experimental validation of the hot-gas defrost process of an air-cooled evaporator

机译：风冷蒸发器热气除霜过程的建模与实验验证

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摘要

A detailed transient simulation model has been developed to predict and evaluate the performance of the hot-gas defrost process of an air-coil evaporator. In the model, the defrost process is subdivided into six stages: preheating, tube frost melting start, fin frost melting start, air presence, tube-fin water film and dry-heating. In each stage, the control volume is subdivided into systems represented by a single node, which has the representative properties of the system. A finite difference approach was used to solve the model equations. The results include the time required to defrost, the distribution of the energy during defrost process, the instantaneous refrigerant properties and the instantaneous fin and tube temperature distribution. The results are compared with experimental data obtained in a local storage facility under actual operating conditions and also using data available in the literature. The model results substantially agree with the experimental data in both cases.
机译：已经开发了详细的瞬态仿真模型，以预测和评估空气线圈蒸发器的热气除霜过程的性能。在该模型中，除霜过程分为六个阶段：预热，管霜融化开始，翅片霜融化开始，空气存在，管翅水膜和干热。在每个阶段，控制量都细分为由单个节点表示的系统，该节点具有系统的代表性属性。使用有限差分法求解模型方程。结果包括除霜所需的时间，除霜过程中能量的分布，瞬时制冷剂特性以及瞬时翅片和管子的温度分布。将结果与在实际操作条件下在本地存储设施中获得的实验数据进行比较，并使用文献中的可用数据进行比较。在两种情况下，模型结果与实验数据基本吻合。

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