壳管式相变蓄热换热器换热特性的模拟研究
摘要：设计了一种以石蜡为相变材料的圆柱型壳管式相变蓄热换热器，以三维单元相变储热模型为研究对象进行了换热数值模拟。分析了相变材料的液相比、温度场、平均温度及换热介质出口温度的变化规律，研究了该壳管式相变蓄热换热器在蓄、放热阶段的换热特性。结果表明：液相石蜡的自然对流会增强相变材料与换热介质之间的换热，并加快石蜡的熔化和凝固速率；蓄热阶段液相比达到18.6%后，自然对流换热的影响逐渐明显；放热阶段初期，液相比在80 s内下降了63%,固态石蜡层完全包裹传热管束前的自然对流换热最强，之后逐渐减弱。
关键词：壳管式相变蓄热换热器换热特性石蜡相变材料液相比蓄热放热自然对流换热
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[2] 闫全英，马超，王威.余热回收的相变换热装置设计及运行[J].实验室研究与探索，2021,40(6):97- 100.
[3] ESAPOUR M,HAMZEHNEZHAD A,RABIENATAJ D A,et al.Melting and solidification of PCM embedded in porous metal foam in horizontal multi-tube heat storage system[J].Energy conversion and management,2018,171:398- 410.
[4] 邬可谊.泡沫金属相变蓄热换热器在余热利用中的模拟[J].中国石油大学学报(自然科学版),2020,44(5):153- 158.
[5] FU W,ZOU T,LIANG X,et al.Thermal properties and thermal conductivity enhancement of composite phase change material using sodium acetate trihydrate-urea/expanded graphite for radiant floor heating system[J].Applied thermal engineering,2018,138:618- 626.
[6] PIZZOLATO A,SHARMA A,MAUTE K,et al.Design of effective fins for fast PCM melting and solidification in shell-and-tube latent heat thermal energy storage through topology optimization[J].Applied energy,2017,208:210- 227.
[7] KOUSHA N,HOSSEINI M,ALIGOODARZ M,et al.Effect of inclination angle on the performance of a shell and tube heat storage unit:an experimental study[J].Applied thermal engineering,2017,112:1497- 1509.
[8] 李洋，王彩霞，宗军，等.不同形式相变储热换热器的对比分析[J].储能科学与技术，2019,8(2):347- 356.
[9] 闫全英，王晨羽，梁高金，等.用添加剂强化有机相变材料导热性能的研究[J].太阳能学报，2021,42(9):205- 209.
Simulation study on heat transfer characteristics of a shell-and-tube phase change heat storage heat exchanger
Abstract: This paper designs a cylindrical shell-and-tube phase change heat storage heat exchanger with paraffin as the phase change material. A numerical simulation of heat transfer is carried out based on the three-dimensional unit phase change heat storage model. The variation rules of the liquid phase ratio, temperature field, average temperature of the phase change material and the outlet temperature of the heat transfer medium are analysed, and the heat transfer characteristics of the shell-and-tube phase change heat storage heat exchanger during heat storage and release are studied. The results show that the natural convection of liquid paraffin can enhance the heat transfer between the phase change material and the heat transfer medium, and accelerate the melting and solidification rate of the paraffin. The effect of natural convective heat transfer is gradually evident after the liquid phase ratio reaches 18.6% in the heat storage phase. In the initial phase of heat release, the liquid phase ratio decreases by 63% within 80 s. The natural convective heat transfer is the strongest before the solid paraffin layer completely wrapped around the heat transfer tube bundle, and then gradually weakens.
Keywords: shell-and-tube phase change heat storage heat exchanger; heat transfer characteristic; paraffin; phase change material; liquid phase ratio; heat storage; heat release; natural convective heat transfer;
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