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A quasi-three-dimensional distributed parameter model of micro-channel separated heat pipe applied for cooling telecommunication cabinets

机译：一种用于冷却电信柜的微通道分离热管的准三维分布参数模型

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摘要

Micro-channel separated heat pipes (micro-channel SHPs), which may cycle without inputting additional electrical power, have shown their advantages of energy saving and compact structure, and they are preferred in the cooling of electronic equipment with narrow inner space. The non-uniformly distributed refrigerant flow among multiple flat tubes and air flow among multiple fins of micro-channel heat exchangers may have a significant effect on the performance of SHPs. In this study, a quasi-three-dimensional distributed parameter model of micro-channel SHPs is proposed for predicting the effects of non-uniformly distributed refrigerant and air flows on the performance. The model is developed by modeling all the components of a micro-channel SHP, i.e. an evaporator, an ascending tube, a condenser and a descending tube, respectively. In the model, the refrigerant flow is described as uneven flow among tubes and the flow direction is fixed inside each tube; the air flow is modelled as the flow with two-dimensional uneven distribution at the windward of heat exchanger and with the fixed direction across the heat exchanger; the three-dimensional partition method is applied to the control volume partition of flat tubes and fins. The proposed model is validated by experiments, and the results show that the deviations between simulated and experimental data of the heat transfer capacity, the temperature difference of micro-channel SHP, the outlet air temperature of evaporator and the outlet air temperature of condenser are 4.6%, 0.9 degrees C, 1.1 degrees C and 0.4 degrees C, respectively.
机译：可以在不输入额外电力的情况下循环的微通道分离的热管（微通道SHPS）示出了它们的节能和紧凑的结构的优点，并且在具有狭窄内空间的电子设备的冷却中，它们是优选的。多个扁平管中的多个扁平管和气流之间的不均匀的制冷剂流动可能对SHP的性能产生显着影响。在该研究中，提出了一种用于预测非均匀分布式制冷剂和空气流对性能的施加的准三维分布参数模型。该模型是通过分别建模微通道SHP的所有组件，即蒸发器，上升管，冷凝器和下降管来开发。在该模型中，制冷剂流动被描述为管中的不均匀流动，并且流动方向固定在每个管内;空气流量被建模为具有热交换器迎风的二维不均匀分布的流动，并且在热交换器上具有固定方向;三维隔板方法应用于扁平管和翅片的控制体分区。所提出的模型通过实验验证，结果表明，仿真和实验数据的传热容量之间的偏差，微通道SHP的温度差，蒸发器的出口空气温度和冷凝器的出口空气温度为4.6 ％，0.9c，1.1摄氏度和0.4℃。

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