严寒地区透光补热塔补热特性研究

STUDY ON HEATING CHARACTERISTICS OF PERVIOUS HEATING TOWER IN COLD REGION

提出一种改进的冷却塔逆用为地源热泵补热的方法,以严寒地区太阳能透光补热塔装置为研究对象,建立补热塔数学模型,通过数值模拟和实验测试研究补热塔装置透光结构面积、液-气比、空气流向对补热的影响。结果表明:在补热塔日运行周期内,双侧透光结构补热塔循环水出口温度平均升高0.5℃,换热量增加147.4 kW;综合分析换热效率和能效比可知,液-气比控制在0.58时换热效果最佳;逆流式补热塔比顺流式补热塔的吸热效率高13%,换热量高5.4 kW,进出口循环水温差增加0.6℃,故选用逆流式补热塔。

An improved cooling tower retroactive heating method for ground source heat pump is proposed.Taking a solar transparent heat supplement tower unit as the research object in cold region,the mathematical models of the heat supplement tower is established.Through the numerical simulation and experimental test,the influences of transparent structure area,liquid-gas ratio and air flow direction on heat supplement are studied.The results show that in the daily operation cycle of the heating tower,the circulating water outlet temperature of double side transparent structure heating tower and the heat transfer rate of cooling tower increase by 0.5℃and 147.4 kW,respectively.Comprehensive analysis of heat transfer efficiency and energy efficiency ratio shows that the best heat transfer effect is achieved if the liquid-gas ratio is controlled at 0.58.Generally,the countercurrent heating tower is improved by 13%on heat absorption efficiency and 5.4 kW on heat exchange than the downstream heating tower.Meanwhile,the temperature difference between inlet and outlet circulating water increases by 0.6℃.Therefore,the countercurrent heating tower is exactly selected.