非均匀风速下翅片管换热器冷剂流路稳健设计

Robust Design of Fin and tube Heat Exchanger’s Refrigerant Circuitry Subject to Different Air Maldistributions

摘要:

非均匀风速分布对翅片管换热器的性能影响显著.采用EVAP COND软件，针对R22和R410A两种制冷剂，在空气进口状态、流量、换热器的几何结构尺寸相同的情况下，研究了4种典型的不均匀风速分布形式及风速不均匀度对热泵空调中冷凝和蒸发两用换热器性能的影响，并对比了三种不同流路布置的换热器性能，结果表明：蒸发器性能受不均匀风速分布的影响比冷凝器更显著，且风速不均匀度越大，换热器的性能越差；通过优化换热器的流路布置可以明显提高换热器的性能.提出一种全交错型流路设计，显著降低了风速分布变化对换热器性能的影响.

Abstract:

Air maldistribution has significant impact on the fin and tube heat exchanger performance. In heat pump applications, the influence of four typical air maldistributions on both evaporator and condenser performance was numerically investigated with the simulation software EVAP COND. For comparison, two refrigerants R22 and R410A, three different refrigerant circuitry designs, and four levels of air maldistributions were taken into account. The results show that air maldistribution has more significant impact on the evaporator performance than the condenser. The heavier the air maldistribution, the worse the heat exchanger performance. Heat exchanger performance can be much improved with well designed refrigerant circuitry. The proposed interlaced refrigerant circuitry design has more robust performance subject to variable air maldistributions.