平行流换热器流量分配均匀性研究

Study on the Uniformity of Flow Distribution of the Parallel-flow Heat Exchanger

单相流体的流动分配均匀性是影响平行流换热器性能的重要因素,也是两相流换热器研究的基础.提出一种16孔分流板结构,以水为工质,研究该分流板对流量分配均匀性的影响,并与无分流板换热器和12孔分流板换热器进行性能对比分析.结果表明：16孔分流板换热器的总流量分配不均匀度最小,流动分配均匀性达到最佳.16孔分流板换热器的总流量分配不均匀度分别比无分流板换热器和12孔分流板换热器减小76％～87.8％和10％ ～ 60％.当制冷剂流量为45～220 kg/h时,12孔分流板换热器的进出口压降比无分流板换热器增加8.3％～34.2％;而16孔分流板换热器的压降则只增加2.8％～12.4％.因此,16孔分流板的综合性能更好.

The distribution uniformity of single-phase fluid is an important factor that affects the performance of parallel-flow heat exchanger, which is also the basis of investigating two-phase flow heat exchanger. A 16-hole deflector is proposed in this paper to study the influence of the 16-hole deflector on the distribution uniformity with the cryogen of water. The performance of heat exchanger of the 16-hole deflector is compared with that of no deflector and the 12-hole deflector. The results show that the total flow maldistribution S of parallel-flow heat exchanger of the 16-hole deflector is the minimum, and the distribution uniformity is the best. S of paral- lel-flow heat exchanger with the 16-hole deflector decreases 76% -87.8% and 10% -60% compared with that of no deflector and 12-hole deflector, respectively. When the flow rates are between 45kg/h and 220kg/h, the pressure drop of heat exchanger of 12-hole deflector increases 8.3% -34.2% than that of no deflector, however, the pressure drop of heat exchanger of 16-hole deflector increases only 2.8%-12.4%. In conclusion, the comprehensive performance of the heat exchanger of 16-hole deflector in the three models is better.