| 摘要: |
| 中空纤维膜换热器可同时实现传质传热，该换热器可应用于吸收式制冷系统以改善制冷性能。为探究该膜换热器在溴化锂吸收式制冷系统的运行工况下的传热传质特性，搭建中空纤维膜换热器性能测试实验台，采用控制变量法探究在热侧不同入口溶液流速、温度下该换热器的传热量及膜通量变化规律特性。结果表明：在热流体其它参数保持不变的情况下，中空纤维膜换热器热侧溶液的入口流速由3.05m/s增至3.30m/s时，换热器总传热量与膜通量均随之加大，增幅分别为16.0%和2.2%；该膜换热器的总传热量在冷侧溶液与热侧溶液入口温差10°C至15°C内，增幅达到18.9%，而膜通量受膜两侧溶液的入口温差变化影响较小，增幅仅3.1%。研究表示：温度的变化对中空纤维膜换热器的传热传质性能影响更为显著，而流速的变化对水分子的运动影响较小。 |
| 关键词: 膜换热器 传热传质 传热量 膜通量 换热性能 |
| DOI： |
| 投稿时间：2024-01-30修订日期：2024-03-27 |
| 基金项目: |
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| Experimental study of heat and mass transfer performance of hollow fiber membrane heat exchanger |
|
Zhao feiyu, Chen hua, Qian tao
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| (School of Mechanical Engineering, Tianjin University of Commerce) |
| Abstract: |
| The hollow fiber membrane heat exchanger(MHE) can simultaneously achieve mass and heat transfer, which can be applied to lithium bromide absorption refrigeration systems to improve system cooling performance. In order to investigate the heat and mass transfer characteristics of the MHE, a MHE performance test rig was built. The variation characteristics of heat transfer and membrane flux of the membrane heat exchanger under different inlet velocity and temperature on the hot side were studied by using the control variable method. The results showed that with other parameters of the thermal fluid kept constant, when the inlet flow rate of the solution on the hot side of the hollow fibre membrane heat exchanger was increased from 3.05 m/s to 3.30 m/s, the total heat transmission and membrane flux increased by 16.0% and 2.2% respectively. The total heat transfer of this membrane heat exchanger increases by 18.9% within a temperature difference of 10℃ to 15℃between the inlet temperature of the cold-side solution and that of the hot-side solution. But the membrane flux change was less, which increased only 3.1%. It also showed that the hot-side inlet temperature variation had a more significant influence on the heat and mass transfer performance of MEH than flow rate, which had less effect on the movement of water molecules. |
| Key words: Membrane heat exchangers heat and mass transfer heat transmission membrane flux Heat transfer performance |