热源塔传质特性的分析和实验研究

Mass transfer characteristics in heat-source tower

通过分析供冷/热设备的特点,指出了热源塔热泵供冷/热的优异性。对热源塔中不同进口空气参数和不同进口溶液温度下传质的4种模式进行了理论分析,并对叉流热源塔在不同进口参数时潜热百分比、进出口空气含湿量差和换热量的变化规律进行了实验研究。实验结果表明:进口溶液温度从-2℃升高到4℃,潜热百分比从27%降低到无潜热交换;提高风量和进口空气温度能同时满足降低潜热百分比和增加总换热量的目的;溶液流量从2.9 L.min-1上升到6.4 L.min-1,潜热百分比从15%升高到28%,系统的换热量也随之增加近50%。实验数据表明热源塔换热中潜热百分比基本上小于30%,为溶液浓度控制和溶液再生提供了实验依据。

Through analyzing the characteristics of equipment for cooling/heating,the superiority of a heat pump with heat-source tower for cooling/heating is presented.With different inlet air parameters and inlet solution temperatures,four different modes of mass transfer in the heat-source tower were discussed theoretically and the latent heat percentage,humidity difference of inlet and outlet air streams,and heating capacity with different inlet parameters were studied by experiments.The experimental results showed that as the inlet solution temperature increased from-2℃ to 4℃,the latent heat percentage reduced from 27% to zero.With the increase of the air flow rate and inlet air temperature,the latent heat percentage decreased and the total heat transfer rate increased.As the flow rate of solution increased from 2.9 L·min-1 to 6.4 L·min-1,the latent heat percentage was raised from 15% to 28% and the total heat transfer rate was also increased nearly 50%.Experimental data also showed that the latent heat percentage in the heat-source tower was usually less than 30%,which provided a guide for control of solution concentration and regeneration of solution.