Experiment Research Of Heat Transfer Enhancement Condenser With Liquid

The condenser is one of the important equipment in the thermal system, everyoneknows the necessary to study the high heat transfer. This article is to study the mass transferand heat of condensation through the method of analysis of experimental data. According tothe research of double-pipe condenser, we have designed a test bench which study thecondensation heat transfer process in condensing visualization.First, by using the method of visualization, we have researched the flow of steamcondensation heat transfer state in the horizontal tube and analysis the heat transfermechanism of the high performance heat transfer condition of the condenser according tothe flow diagram. The result of the study shows that: in the process of condensation heattransfer, the flow of steam in the pipe is bead flow pattern, membrane flow pattern,stratified flow pattern, corrugated stratified flow pattern, vapor slug flow type and columnarflow pattern. When the experiment gets stability, these flow pattern will change periodicallyand the proportion of flow pattern can determine according to the length of the section.Second, we have researched the heat transfer performance of the high performanceheat transfer condition of the condenser. The aim to this research is to seek the relationbetween the length of the steam tube heat exchange and the characteristics of thethermodynamic parameters by the drop condensation gradient to film condensation, at thelength of the phase transition point, we try to push the condensation water discharge earlier,in order to maintain higher convective heat transfer coefficient. The result shows that: thelength of condensation state turning point are closely related to steam inlet velocity, fluidpressure drop and steam quality.The temperature of the cooling water inlet is25℃,traffic is150kg/h,the temperature ofsteam inlet is115℃,steam velocity ranges from10.24kg/h to4.44kg/h,improving the flowrate of the steam can largely break the inner surface of tube wall condensation water toform the bead condensation by increasing heat exchange area and reducing the contactthermal resistance and increasing the pressure drop and delaying the process of condensedphase change to improve the overall thermal efficiency. The steam intel flow is5.11kg/h,the temperature of steam inlet is105℃,the pressure is0.18MPA, the temperature of thecooling water inlet ranges from10℃to30℃,reducing the temperature of the cooling waterinlet can increase the steam condensation rate and improve the overall thermal efficiency.Last, according to the research date, we have worked out a correlation about the lengthof condensation and heat transfer coefficient with steam inlet velocity, fluid pressure andtemperature. and we have given guiding significance to the correlations, and the errorbetween experimental value and the theoretical calculation value is less than10%.On the basis of this we designed preliminary structure of condenser and did the test, the resultshows that: its thermal efficiency is higher than ordinary condenser.