| 摘要: |
| 在气液相变过程中实施气液调配来主动调节干度和流量，可实现同时提升传热系数（h）和降低压降(Δp)。本文从气液调配强化传热原理、气液调配单元和气液调配换热器三个方面，总结国内外研究现状。主动气液调配在冷凝过程（分液冷凝）和蒸发过程（配液蒸发）中均需使工质处于高效传热区，但目标干度不同。重点关注了有联箱-小孔型、T型管和金属丝网这三类气液调配单元，发现低质量流量下联箱-小孔型与T型管的分液比率（FL）可达100%，而金属丝网型仅为30%。分液冷凝器的传热系数相比常规换热器可提升112%，但蒸发过程的气液调配研究较少，调配机理尚不清晰，需要进一步开展研究。气液调配式换热器的性能与气液分离效率（η）和支管的干度与流量分配紧密相关，基于多维联合仿真法综合考虑气液两相在联箱内的流态（气泡、液膜和液滴）、气液相界面传质和管道压降等影响因素有望提升气液调配换热器模型的预测精度。 |
| 关键词: 主动气液调配 分液冷凝 配液蒸发 换热器 |
| DOI： |
| Received:September 27, 2022Revised:November 07, 2022 |
| 基金项目:广东省基础与应用基础研究基金自然科学基金（2022A1515012035）和2021年佛山市促进高校科技成果服务产业发展扶持项目（基于气液调配强化传热和储热的高效热泵研发及产业化资助。 |
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| Research Status of Active Vapor-liquid Adjusting Heat Exchangers |
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Huang Kunteng1, Chen Jianyong1, Chen Ying1, Luo Xianglong1, Liang Yingzong1, He Jiacheng1, Shi Yongkang2
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| (1.School of Materials and Energy, Guangdong University of Technology;2.Guangdong GEME Refrigeration Equipment Co., Ltd.) |
| Abstract: |
| Implementing active vapor-liquid adjustment during phase change processes can enhance the heat transfer coefficient (h) and decrease the pressure drop (Δp) simultaneously. In this study, the current status of vapor-liquid adjustment principles, vapor-liquid adjustment units, and heat exchangers are comprehensively reviewed. The objective of active vapor-liquid adjustment is to adjust the vapor quality to extend the highly efficient heat transfer region during condensation (liquid-separation condensation) and evaporation (liquid adjustment evaporation) processes; however, the targeted vapor qualities are different. The vapor-liquid adjustment units, namely, the orifice-baffle header, T-junction header, and header with mesh-pore structure, are considered. It was observed that the liquid drainage ratio (FL) of the orifice-baffle and T-junction headers can be up to 100% at a low inlet mass flow rate, but only 30% in headers with mesh-pore structures. The HTC of liquid-separation condensers can be increased by up to 112% compared to conventional condensers. However, the application of vapor- liquid adjustment during evaporation is limited, and its mechanisms require further investigation. The performance of vapor-liquid adjusting heat exchangers is highly correlated to the vapor-liquid separation efficiency (η) and distributions of the vapor quality and mass flow rate in the branches. Based on the co-simulation method that adds the flow pattern factors in the header (bubble, liquid film, and droplet), the mass transfer between the vapor and liquid interface and branch pressure drop improves the model accuracy of the vapor-liquid adjusting heat exchanger. |
| Key words: vapor-liquid adjustment liquid-separation condensation liquid-adjustment evaporation heat exchanger numerical method |
