CAJ | 학술논문

利用自制实验台,在前期实验工作的基础上,对叉流板式间接蒸发冷却器进行了实验研究.发现换热器两侧空气的流量比、流量大小对换热器的效率有着重要影响.影响趋势在干工况与湿工况下又有所不同,这是因为换热器中两流体的热容量之比发生了很大变化.实验结果表明:干工况下,换热器的摩擦阻力系数大于按层流理论公式计算所得的值,层流向湍流过渡的雷诺数为1200左右;喷水情况下二次空气侧的阻力系数远大于干工况下的阻力系数,约为干工况下的2.5到3倍之间.分析结果可以对换热器的优化设计提供一定的参考和帮助.
이용자제실험태,재전기실험공작적기출상,대차류판식간접증발냉각기진행료실험연구.발현환열기량측공기적류량비、류량대소대환열기적효솔유착중요영향.영향추세재간공황여습공황하우유소불동,저시인위환열기중량류체적열용량지비발생료흔대변화.실험결과표명:간공황하,환열기적마찰조력계수대우안층류이론공식계산소득적치,층류향단류과도적뢰낙수위1200좌우;분수정황하이차공기측적조력계수원대우간공황하적조력계수,약위간공황하적2.5도3배지간.분석결과가이대환열기적우화설계제공일정적삼고화방조.
An experimental investigation was conducted on the performance of a crossflow plate type heat exchanger used as an indirect evaporative cooler.It is found that both the air mass flow rate and the ratio of the mass flow rate have a significant effect on the heat exchanger performance.The clear difference in performance is found for dry and wet conditions due to the great change in the ratio of the heat capacity rate of the two fluids.The experimental results show that the actual friction factor was greater than the theoretical value obtained from the laminar flow equation and the critical Re number was about 1200 under dry condition.In addition,the friction factor under wet condition was 2.5-3 times that under dry condition.