| 摘要: |
| 强化管的使用在蒸发器中会造成压降增加,本文提出一种主动配液式蒸发器,通过重新调配沿程质量流速和干度来降 低流动压降。 建立了主动配液式蒸发器的物理模型和数学模型,并进行了实验验证;在 14~ 26 g / s 流量范围内,对比了主动配液 式蒸发器与普通蒸发器干度、质量流速和压力等参数的沿程分布。 结果表明:采用 R410A 为制冷剂,入口压力为 1. 2 MPa 时,普 通蒸发器沿程干度和压降不断增加,质量流速随支管数增加而减少。 相比普通蒸发器,主动配液式蒸发器第三管程的入口干度 提升了 1. 82 倍且质量流速下降了 43. 2%;此外,主动配液式蒸发器压降显著减小,当入口流量为 26 g / s 时,压降减少 21. 5%。 |
| 关键词: 蒸发器 主动配液 强化传热 压降 分液隔板 |
| DOI： |
| 投稿时间：2021-09-05 修订日期：2021-12-07
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| 基金项目:本文受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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| Pressure Drop Characteristics of a Novel Active Liquid Feeding Evaporator |
| Li Junjie,Chen Jianyong,Chen Ying,Luo Xianglong,Liang Yingzong,Yang Zhi,He Jiacheng |
| (School of Material and Energy, Guangdong University of Technology) |
| Abstract: |
| The application of enhanced tubes in an evaporator inevitably results in a higher pressure drop. Herein, a novel active liquid feeding evaporator is proposed to reduce the pressure drop by actively adjusting the mass flow rate and vapor quality along the flow path. Physical and mathematical models are established and experimentally verified. Comparisons of the vapor quality, mass flow rate, and pres- sure between the new and conventional evaporators are performed in the flow rate ranging from 14 g / s to 26 g / s. Results indicate that the quality and pressure drop in the conventional evaporator increased, whereas the mass flow rate decreased as the number of tubes increased under an inlet pressure of 1. 2 MPa using R410A. The inlet quality at the third path of the novel evaporator can be increased by 1. 82 times compared with that of the conventional evaporator, and the mass flow rate can be reduced by 43. 2%. Moreover, the new evaporator exhibits a lower pressure drop by 21. 5% at an inlet mass flow rate of 26 g / s. |
| Key words: evaporator active liquid feeding heat transfer enhancement pressure drop vapor-liquid separator |
