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首页> 外文期刊>International Journal of Heat and Mass Transfer >Local frosting behavior of a plated-fin and tube heat exchanger according to the refrigerant flow direction and surface treatment
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Local frosting behavior of a plated-fin and tube heat exchanger according to the refrigerant flow direction and surface treatment

机译：根据制冷剂的流动方向和表面处理，翅片管式热交换器的局部结霜行为

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摘要

Heat pumps have been promoted as energy-efficient heating and cooling systems. However, in the heating mode, heat pump performance is often significantly degraded by the frost layer that forms on the fin surface of the heat exchanger due to the low temperature of the outdoor unit. In this research, we experimentally investigated the thermal performance and frosting behavior at various locations on a plate-fin and tube heat exchanger with respect to refrigerant flow direction (counter-flow and parallel-flow) and fin surface treatment (bare, hydrophilic, hydrophobic, and hybrid). On the bare heat exchanger, the frost growth was more uniform with a counter-flow than with a parallel-flow, and thus the overall heat transfer rate was higher under counter-flow condition. The performance difference between the counter-flow and parallel-flow conditions became more significant when the heat exchanger was operated at lower refrigerant temperature and air velocity. Although the initial heat transfer rate of the hydrophilic unit was the highest among the surface-treated heat exchangers, this unit also suffered a dramatic reduction in the heat transfer rate because of the fast frost growth and non-uniform frosting behavior on its rear side. On the other hand, although the hydrophobic heat exchanger had a slightly lower initial heat transfer rate than the hydrophilic unit, it exhibited a consistent heat transfer rate throughout the experiment, owing to the frost retardation effect and the relatively uniform frosting behavior on its rear side. Each of the hybrid hydrophilic-hydrophobic surface-treated heat exchangers showed a lesser reduction of the heat transfer rate than the hydrophilic unit, and a higher initial heat transfer rate than the hydrophobic unit.
机译：热泵已被推广为节能的加热和冷却系统。但是，在制热模式下，由于室外机的低温，在热交换器的翅片表面上形成的霜层经常使热泵的性能大大降低。在这项研究中，我们通过实验研究了板翅片管式换热器在各个位置的热性能和结霜行为，这些方面与制冷剂的流动方向（逆流和平行流）和翅片表面处理（裸露，亲水，疏水）有关和混合）。在裸露的热交换器上，逆流比平行流的霜冻生长更均匀，因此在逆流条件下，总的传热率更高。当热交换器在较低的制冷剂温度和空气速度下运行时，逆流条件和平行流条件之间的性能差异变得更加明显。尽管亲水单元的初始传热速率在经过表面处理的换热器中最高，但由于其快速的霜生长和背面的不均匀结霜行为，该单元的传热速率也显着下降。另一方面，尽管疏水性换热器的初始传热速率比亲水性单元低，但由于结霜效果和背面相对均匀的结霜行为，疏水性换热器在整个实验过程中均表现出一致的传热速率。 。与亲水单元混合的每个亲水-疏水表面处理过的热交换器都显示出比亲水单元少的传热速率降低，并且比疏水单元更高的初始传热速率。

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