首页> 外文期刊>International Journal of Heat and Mass Transfer >Performance testing of 2-fluid and 3-fluid liquid-to-air membrane energy exchangers for HVAC applications in cold-dry climates
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Performance testing of 2-fluid and 3-fluid liquid-to-air membrane energy exchangers for HVAC applications in cold-dry climates

机译:在冷干气候下用于HVAC的2流体和3流体液-气膜换热器的性能测试

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摘要

Liquid-to-air membrane energy exchangers (LAMEEs) can avoid the problem of desiccant droplets carryover by using semi-permeable membranes to separate the air and desiccant solution streams. The aim of this study is to test and compare the heat and moisture transfer performances between the air and desiccant solution inside a novel 3-fluid LAMEE and a 2-fluid LAMEE under air heating and humidifying conditions. The effect of flow maldistribution on the deterioration of the 3-fluid LAMEE's performance is estimated, and an experimental study of the feasibility of membrane pre-tension to reduce flow maldistribution caused by membrane deflections in flat-plate LAMEEs is presented. Unlike heat exchangers where the lowest possible outlet hot fluid temperature is equal to the inlet cold fluid temperature, experimental data show that the outlet desiccant solution (hot fluid) temperature in the 2-fluid LAMEE may be lower than the inlet air (cold fluid) temperature. This is attributed to the effect of the phase change energy associated with the air humidification process.
机译:液空膜能量交换器(LAMEE)可以通过使用半透膜将空气和干燥剂溶液流分开来避免干燥剂液滴残留的问题。这项研究的目的是测试和比较在空气加热和加湿条件下,新型3流体LAMEE和2流体LAMEE中空气和干燥剂溶液之间的空气和湿气的传热性能。估计了流量分配不均对3流体LAMEE性能恶化的影响,并进行了膜预拉伸以减少平板LAMEE膜偏斜引起的流量分配不均的可行性的实验研究。与热交换器的最低出口热流体温度等于入口冷流体温度不同,实验数据表明,两流体LAMEE中的出口干燥剂溶液(热流体)温度可能低于入口空气(冷流体)。温度。这归因于与空气加湿过程相关的相变能量的影响。

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