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Energy transfer and energy saving potentials of air-to-air membrane energy exchanger for ventilation in cold climates

机译：空气-空气膜换热器在寒冷气候中的换热和节能潜力

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摘要

Frosting occurring inside heat exchangers degrades the exchangers' performance and reduces energy recovery in cold climates. The moisture transport in membrane energy exchangers (MEE) provides a great potential to increase frost tolerance and decrease energy consumption by the air handling units (AHU). In addition, the moisture recovery in MEEs tends to improve the thermal comfort by adding moisture to the indoor dry air. However, applications of MEEs for cold climates are less known compared to their use in hot and humid climates as independent cooling and dehumidification. The open literatures dealing with heat and mass transfer of the MEEs for cold climates are scarce and acute. This research aims to investigate heat and moisture transfer, and energy saving potentials of MEEs compared to the sensible-only heat exchanger (HE). The applicability of transforming heat and moisture transfer analysis carried out for hot and humid conditions to cold climates is examined. The study attempts to "translate" conventional sensible-only HE correlations to the MEEs. Knowledge and data of heat exchangers are transformed to MEEs through analysing the boundary conditions of heat and mass transfer in both MEE and HE. This transformation can reduce needs of relying on computational fluid dynamics (CFD) to analyse heat and mass transfer in MEEs. As one of most important advantages of adopting MEE in cold climates, frosting reduction by the MEE is determined and compared for a specific MEE and HE in the heating season of Oslo (Norway). The energy consumption by the AHU equipped with the MEE is compared to the AHU with HE under different airflow rates. The MEE is able to significantly reduce the energy consumption by preheating and post-conditioning (reheating and humidifying) when there is frosting risk in MEE or HE for Oslo climate. (C) 2016 Elsevier B.V. All rights reserved.
机译：热交换器内部结霜会降低热交换器的性能，并降低寒冷气候下的能量回收。膜式能量交换器（MEE）中的水分输送具有很大的潜力，可以提高防霜性能并减少空气处理单元（AHU）的能耗。此外，MEE中的水分回收会通过向室内干燥空气中添加水分来改善热舒适性。然而，与在炎热和潮湿气候中作为独立的制冷和除湿设备使用的MEE相比，在寒冷气候中使用MEE的情况鲜为人知。有关寒冷气候中的MEE传热和传质的公开文献稀少而敏锐。这项研究旨在研究与智能换热器（HE）相比，MEE的热量和水分传递以及节能潜力。检验了在炎热和潮湿条件下将热和水分传递分析转换为寒冷气候的适用性。这项研究试图将常规的仅有意义的HE相关性“转化”为MEE。通过分析MEE和HE中传热和传质的边界条件，将热交换器的知识和数据转换为MEE。这种转换可以减少依靠计算流体动力学（CFD）来分析MEE中传热和传质的需求。作为在寒冷气候下采用MEE的最重要优点之一，是确定并比较了在奥斯陆（挪威）供暖季节特定MEE和HE的MEE减少结霜。在不同的风量下，将配备MEE的AHU与配备HE的AHU的能耗进行比较。当MEE或HE中存在奥斯陆气候的结霜风险时，MEE可以通过预热和后处理（再加热和加湿）来显着降低能耗。 （C）2016 Elsevier B.V.保留所有权利。

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