主动式冷梁性能实验研究

Experimental Study on the Performance of Active Chilled Beams

对一台主动式冷梁进行了实验研究,通过改变一次风量、一次风温度和供水温度,分析得出以上因素对冷梁诱导比和换热量的影响。结果显示:一次风量在130~170 m^3/h范围内,诱导比由2.5增加到2.9,增幅为16%,换热量从1350 J增加到1900 J,增长了28.9%。一次风温度对诱导比影响并不明显;一次风温和供水温度之间的温差越大,换热量越大。供水温度对诱导比和换热量的影响在冬夏季有很大不同,冬季工况下,供水温度在30~50℃时,诱导比从1.7升高到2.9,提高了70%;换热量从400 J增加到1900 J,增长375%。夏季工况下,供水温度由15℃升高到18℃,诱导比从2.5升高到2.8,增长了12%;换热量从800 J减少到500 J,减少了37.5%。研究结果为主动式冷梁的实际应用提供研究的基础。

An active cold beam is experimentally studied.By changing the primary air volume,primary air temperature and water supply temperature,the effects of the above factors on the induction ratio and heat transfer of the cold beam are analyzed.The results show that in the range of 130~170 m^3/h,the induction ratio increases from 2.5 to 2.9,with an increase of 16%,and the heat transfer increases from 1350 J to 1900 J,with an increase of 28.9%.The influence of primary air temperature on induction ratio is not obvious;the greater the temperature difference between primary air temperature and water supply temperature,the greater the heat transfer.The influence of water supply temperature on induction ratio and heat transfer is quite different in winter and summer.In winter,the induction ratio increases from 1.7 to 2.9 when the water supply temperature is between 30℃and 50℃,increasing by 70%,and the heat transfer increases by 375%from 400 J to 1900 J.In summer,the water supply temperature rises from 15℃to 18℃,the induction ratio rises from 2.5 to 2.8,increasing by 12%,and the heat transfer decreases by37.5%from 800 J to 500 J.The research results provide a basis for the practical application of active cold beam.