薄膜输运性质对全热交换器结露特性影响

doi:10.11949/0438-1157.20200679

摘要/Abstract

摘要：

薄膜式全热交换器是一种可同时回收热量和湿量的装置，通常被用来减少建筑能耗同时改善室内空气品质。数值研究了薄膜输运性质对全热交换器结露特性的影响，得到了结露特性曲线和临界结露温度，用以表征结露特性，并综合考虑安全性和经济性给出了薄膜输运参数的推荐值。研究结果表明：室外空气温度和湿度越高，越容易发生结露，薄膜热导率对全热交换器的结露特性和效能影响很小，而膜内水蒸气扩散系数的增加可以显著提高全热交换器的抗结露特性和效能，且进气侧与排气侧的入口交汇处最容易发生结露。

关键词: 薄膜式全热交换器, 膜输运性质, 结露, 传热, 传质, 数值模拟

Abstract:

Membrane-type total heat exchanger (THX) is a device that can recover both heat and moisture, it is often used to reduce the building energy consumption and improve the indoor air quality. The effects of membrane transport properties on the moisture condensation of a THX has been numerically studied, the condensation characteristics curves and the critical condensation temperature are obtained to represent the moisture condensation characteristics, and the optimal membrane properties are recommended based on the combined consideration of safety and economy. The results show that the higher the outdoor air temperature and relative humidity, the more likely the moisture condensation takes place. The membrane thermal conductivity has a slight influence on the condensation characteristics and performance of the THX, the increase of the in-membrane moisture diffusivity can significantly improve the anti-condensation characteristics and effectiveness of the THX, with the moisture condensation occurring more easily at the membrane surfaces at the junction of the supply outdoor and exhaust indoor airstreams.

Key words: membrane-type total heat exchanger, membrane transport property, moisture condensation, heat transfer, mass transfer, numerical simulation

中图分类号:

TK 172

沈志杰, 闵敬春. 薄膜输运性质对全热交换器结露特性影响[J]. 化工学报, 2020, 71(S2): 32-38.

Zhijie SHEN, Jingchun MIN. Membrane transport property effects on moisture condensation of a membrane-type total heat exchanger[J]. CIESC Journal, 2020, 71(S2): 32-38.

图/表 7

图1 薄膜式全热交换器的物理模型

Fig.1 Physical model of THX

表1 换热芯结构与膜物性参数

Table 1 THX core dimensions and membrane parameters

参数	数值
换热芯结构
x_F, y_F/m	0.25
d/mm	2
N	180
δ/mm	0.25
薄膜物性
λ_m/(W/(m·K))	0.1~0.3
D_wm/(kg/(m·s))	1.0×10^-7~5.0×10^-7
C	2.5
w_max/(kg/kg)	0.25

图2 不同薄膜热导率下的结露特性

Fig.2 Moisture condensation for different membrane thermal conductivities

图3 不同薄膜热导率下的换热器效率

Fig.3 Effectiveness of THX for different membrane thermal conductivities

图4 不同扩散系数下的结露特性

Fig.4 Moisture condensation for different membrane moisture diffusivities

图5 不同扩散系数下的换热器效率

Fig.5 Effectiveness of THX for different membrane moisture diffusivities

图6 不同膜材料表面上的空气相对湿度云图

Fig.6 Relative humidity contours at membrane surfaces for different membrane materials

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