Numerical investigation on shell-side performances of combined parallel and serial two shell-pass shell-and-tube heat exchangers with continuous helical baffles
Numerical investigation on shell-side performances of combined parallel and serial two shell-pass shell-and-tube heat exchangers with continuous helical baffles
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并联和串联组合的连续螺旋折流板两壳程管壳式换热器壳程性能数值研究
DOI：
10.1016/j.apenergy.2014.11.029
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发表时间：
2015-02
期刊：
影响因子：
11.2
通讯作者：
Q. W. Wang
中科院分区：
文献类型：
--
作者：
J. F. Yang;M. Zeng;Q. W. Wang
为了提高换热性能，提出了两种壳通管式换热器（CPTSP-STHXs & CSTSP-STHXs）的并联和串联组合方案，其壳通管设置连续螺旋挡板。通过计算机仿真，将CPTSP-STHX和CSTSP-STHX与节段折流板管壳式换热器（SG-STHX）进行了比较。模拟结果表明，CPTSP-STHX和CSTSP-STHX-1的总换热率q0比SG-STHX分别提高了近5.1%和9.5%，换热系数分别比SG-STHX提高了近7.6%和14.8%，且两者具有相同的质量流率、相同的换热面积aa和相同的压降Δp。同样在相同的质量流量、相同的换热面积aa下，CSTSP-STHX-2的q0和Δpof比SG-STHX分别提高了近46.3%和130.9%。综合性能方面，在相同换热面积和总压降Δp下，CPTSP-STHX、CSTSP-STHX-1和CSTSP-STHX-2的换热系数比SG-STHX分别提高了近7.6%、14.8%和31.2%。因此，CPTSP-STHX和CSTSP-STHX的综合性能优于SG-STHX，其中CSTSP-STHX的综合性能最好。
Combined parallel and serial two shell-pass shell-and-tube heat exchangers (CPTSP-STHXs & CSTSP-STHXs) whose outer shell pass are set up continuous helical baffles have been proposed to enhance the heat transfer performance. The CPTSP-STHX and CSTSP-STHX are compared with the segmental baffled shell-and-tube heat exchanger (SG-STHX) by computer simulation. The results of simulation present that, total heat transfer rateQof the CPTSP-STHX and CSTSP-STHX-1 raise nearly 5.1% and 9.5% respectively, and the heat transfer coefficienthof the CPTSP-STHX and CSTSP-STHX-1 enhance nearly 7.6% and 14.8% than that of SG-STHX, while all of them have the same mass flow rateM, the same heat transfer areaA, and the same pressure drop Δp. Also under the same mass flow rateMand the same heat transfer areaA, theQand the Δpof the CSTSP-STHX-2 increase nearly by 46.3% and 130.9% than those of the SG-STHX, respectively. As to the comprehensive performance, under the same heat transfer areaAand overall pressure drop Δp, the heat transfer coefficienthof the CPTSP-STHX, CSTSP-STHX-1 and CSTSP-STHX-2 raise nearly 7.6%, 14.8% and 31.2% respectively compared with the SG-STHX. Thereby the CPTSP-STHX and CSTSP-STHX have better comprehensive performance than that of SG-STHX, and furthermore the CSTSP-STHX is the best one among three.
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