双热源复合换热器复合换热温差影响因素分析

空气-水双热源复合换热器是太阳能-空气双热源复合热泵系统的核心部件,空气-水双热源复合换热器的有效复合换热温差对空气-水双热源复合换热器的换热性能以及太阳能-空气双热源复合热泵的系统性能具有重要影响。建立了空气-水双热源复合换热器和太阳能-空气双热源复合热泵系统的数学模型,利用数学模拟的方法研究了空气-水双热源复合换热器结构参数,即内外管径、翅片间距对有效复合换热温差的影响。模拟结果表明:空气-水双热源复合换热器的有效复合换热温差随内管管径的减小、外管管径的增大以及翅片间距的减小而增大。

The influence factors of the compound heat-exchanging temperature difference of dual-source compound heat-exchanger

The air-water dual-source compound heat-exchanger is the key component of the solar-air dual-source compound heat pump system.The heat-exchanging performance of the air-water dual-source compound heat-exchanger and the system performance of the solar-air dual-source compound heat pump system largely depend on the effective compound heat-exchanging temperature difference of the air-water dual-source compound heat-exchanger.The mathematic models of the air-water dual-source compound heat-exchanger and the solar-air dual-source compound heat pump system were established,and the mathematic simulation was used to study the effect of the structure parameters of air-water dual-source compound heat-exchanger such as the tube diameter and the fin space on the effective compound heat-exchanging temperature difference.The simulated results show that the effective compound heat-exchanging temperature difference of the air-water dual-source compound heat-exchanger increases while the inner-tube diameter and the fin space decrease,and the outer-tube diameter increases.