横流热源塔传热传质系数实验研究

Experimental Study of Heat and Mass Transfer Coefficients in a Cross-Flow Heating Tower

热源塔热泵系统由于其可实现高效制冷制热,无结霜问题,且不受地理条件限制,受到了越来越多的关注。热源塔作为热泵系统冬季取热的核心部件,对系统整体性能有着重要影响。本文构建了以乙二醇溶液为循环工质的横流热源塔实验系统,研究了空气流量、温度、含湿量及溶液流量、温度、浓度对传热传质系数的影响规律,并拟合出了关联式,结果显示传热传质系数主要受空气流量密度及淋液密度的影响,Le数在0.91~1.12之间变化。

A heating tower heat pump（HTHP）, as a novel integrated heating and cooling unit, is drawing more and more attention due to its high efficiency, low limitation of geographic conditions and no frost issue. Heating tower is a significant unit of HTHP system and greatly affects system performance. This paper experimentally studies the heat and mass transfer characteristics of a cross-flow heating tower, which uses PVC structured packing and takes glycol as cycling fluid. The effects of the inlet parameters, including air and solution flow rates, air inlet temperature and humidity ratio, solution inlet temperature and concentration, on heat and mass transfer coefficients are investigated. Correlation expressions of heat and mass transfer coefficients are proposed, which shows the coefficients mainly depend on air and solution flow rates. And the Lewis number in this research is about 0.91～1.12.