Experimental Study on Outlet Temperature
Distribution in Plate-Fin Heat Exchangers under Secondary Header Configuration
Wang Jiang,Li Yanzhong, Zhou Aimin,Zhang Ke,Wen Jian
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:Based on our study on the flow maldistribution in a plate-fin heat exchanger,
the exit temperature distribution in the heat exchanger under the secondary header
configuration was experimentally studied.The results show that the temperature change of
the heat exchanger is consistent with flow pattern and the maldistribution is more and
more severe with the increase of ª«Reª« velues.In addition,larger temperature difference
of heat transfer can enlarge the maldistribution of the temperature.By comparing the
temperature distributions in the heat exchanger between the header construction with the
secondary header and the traditional header configuration,it is found that the temperature
distribution with the secondary header is obviously improved, and the improvement is more
efficient under higher Re velues. The efficiency of the heat exchanger can been improved
by about 7%.
Keywords:plate-fin heat exchanger;flow distribution;header configuration;heat exchanger
efficiency